WO2005022095A1 - 音振解析装置および音振解析方法、並びに音振解析用のプログラムおよび音振解析用のプログラムが記録されたコンピュータ読み取り可能な記録媒体 - Google Patents
音振解析装置および音振解析方法、並びに音振解析用のプログラムおよび音振解析用のプログラムが記録されたコンピュータ読み取り可能な記録媒体 Download PDFInfo
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- WO2005022095A1 WO2005022095A1 PCT/JP2004/012785 JP2004012785W WO2005022095A1 WO 2005022095 A1 WO2005022095 A1 WO 2005022095A1 JP 2004012785 W JP2004012785 W JP 2004012785W WO 2005022095 A1 WO2005022095 A1 WO 2005022095A1
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- sound
- data
- vibration
- order
- rotating bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/028—Acoustic or vibration analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/003—Measuring characteristics of vibrations in solids by using direct conduction to the detector of rotating machines
Definitions
- Sound-vibration analysis device and sound-vibration analysis method Description Sound-vibration analysis device and sound-vibration analysis method, computer program for sound-vibration analysis, and computer-readable recording medium on which program for sound-vibration analysis is recorded
- the present invention relates to a device for analyzing sound or vibration generated by rotation of a rotating body, and more specifically, to investigate a correlation between a sensory test performed by actually running a vehicle and a sound of a gear (gear) generated from a transmission or the like.
- TECHNICAL FIELD The present invention relates to an apparatus and a method for analyzing abnormal sounds, a program used in the apparatus, and a recording medium on which the program is recorded and which can be read by a computer.
- discontinuous noise includes gear rattling noise generated when the gears rotate while meshing, and noise generated from the bearing rolling surface (hereinafter collectively referred to as abnormal noise).
- abnormal noise Conventionally, for the purpose of preventing the occurrence of such abnormal noise, a sensory test has been performed by an operator, and a device for analyzing abnormal noise has been developed.
- the analysis device disclosed in Japanese Patent No. 2596081 (pages 2 and 3 and FIG. 1) generates vibration generated according to the rotation speed within a desired range while changing the rotation speed of the gear.
- the signal within the frequency range determined according to the rotational speed of the gear and the number of teeth is extracted from the measured and frequency-analyzed signals. According to this analyzer, the maximum value of abnormal noise is extracted. You.
- JP 2002-257685A (paragraphs 00 15 and 001 6, 4th
- the analyzer disclosed in Fig. 2 simultaneously measures the unevenness of the rotation speed when the gear rotates and the sound pressure of the sound generated from the gear, and compares the waveforms of the respective signals. According to the device, it is determined whether the sound generated in the gear transmission having gears is caused by the gear or by other factors.
- the analysis device disclosed in Japanese Patent Application Laid-Open No. 2000-194924 includes a sound collecting microphone and a recorder provided on a motorcycle.
- the sound during driving is taken in as data, and the order is known in advance, and the sound of the higher order in the whole sound is specified using the order filter, and this sound is analyzed. According to the device, evaluation based on the order sound is performed.
- the conventional analyzer when there are a plurality of rotating bodies, it is not possible to specify the place where the abnormal noise occurs. Further, even if an attempt is made to specify the place where abnormal noise occurs in the sensory test, the sensory test is likely to vary because it is based on human sensibility, and it is difficult to examine the correlation with the actual measurement result. In particular, in a device such as an automobile transmission, in which gears are arranged in multiple stages on one rotating shaft, or in which the rotating shafts are multi-axial, the number of sites where abnormal noise is estimated increases, and It is difficult to identify.
- the conventional analyzer performs the evaluation based on the elapsed time of the number of revolutions of the rotating body, and when the inspection target moves like a car, the actual vehicle speed and the rotating speed of the rotating body are used. It may be difficult to check the correlation between the measurement results.
- An object of the present invention is to solve the above-mentioned problems and to provide an analyzer capable of reliably determining a sound generation factor and a sound generation location. It is another object of the present invention to provide an analyzer capable of reliably determining the cause of vibration even when vibration is measured instead of sound. Disclosure of the invention
- the present invention provides a method of decomposing sound or vibration generated by rotation of a plurality of rotating bodies when a power transmission mechanism of a vehicle having the plurality of rotating bodies is operated.
- a sound and vibration analysis device that takes in data and rotation speed data of a rotating body selected from the plurality of rotating bodies and performs sound and vibration analysis, wherein the sound or vibration data is subjected to frequency analysis.
- Frequency analysis means for calculating the frequencies of the plurality of rotating bodies, and order conversion means for calculating the degree corresponding to the specifications of the plurality of rotating bodies based on the data of the frequencies of the plurality of rotating bodies.
- Speed conversion means for calculating the speed of the vehicle based on data on the number of revolutions of the rotating body; and a sound pressure level obtained based on the sound or vibration data displayed in association with the order and the speed of the vehicle.
- a sound and vibration analysis device comprising:
- the sound and vibration analysis device of the present invention when sound or vibration is generated from a plurality of rotating bodies provided in a power transmission mechanism of a vehicle, data of the sound or vibration is fetched and the data is obtained for each rotating body. Is calculated, which is a variable independent of the number of rotations.
- the speed of the vehicle is calculated based on the rotation speed data of the rotator selected from the plurality of rotators. Then, the sound pressure level acquired based on the sound or vibration data is displayed on the display means in association with the previously calculated order vehicle speed. For example, the order of the sound generated from the rotating body is determined by the number of teeth of the rotating body. Therefore, if the order associated with the sound is examined, the rotating body that is the source of the sound is specified.
- the order of sound or vibration is calculated and the sound pressure level with respect to the calculated order and the vehicle speed is displayed.
- the source of the vibration can be specified.
- the source of abnormal noise and vibration can be reliably identified, which contributes to a reduction in the number of replacement work.
- the source of abnormal noise and vibration can be specified by the order that does not depend on the number of revolutions of the rotating body, so even if there are multiple rotating bodies with similar frequencies, the source of abnormal noise or vibration is controlled. Well done.
- the sound and vibration analysis apparatus of the present invention further includes a reproducing unit that reproduces a sound including a specific order selected based on the display on the display unit.
- a reproducing unit that reproduces a sound including a specific order selected based on the display on the display unit.
- sound and vibration analysis apparatus of the present invention sound including a specific order is reproduced. This makes it easier to match with the sensory test, making it easier to confirm the generation of abnormal noise and vibration and to identify the source of the noise or vibration.
- the reproducing means removes an original sound composed of the sound or vibration data, a sound including the specific order, or a component of a sound including the specific order from the original sound. It is desirable to selectively play any of the sounds.
- the original sound is almost equal to the sound emitted by the vehicle or the power transmission mechanism at the time of measurement, and the sound containing a specific order corresponds to the abnormal noise generated by the power transmission mechanism.
- the sound obtained by removing the components of the sound including the specific order from the original sound is almost equal to the sound emitted from the vehicle or the power transmission mechanism after removing the source of the abnormal noise. Therefore, it is easier to identify the source of the sound by comparing the sounds.
- the sound and vibration analysis device of the present invention it is possible to reproduce an original sound composed of a captured sound or vibration, a sound including a specific order, and a sound obtained by removing a specific component from the original sound. Therefore, it is possible to reproduce the state at the time of measurement, listen to only abnormal noise, and confirm the state where the source of the abnormal noise has been removed.In addition to the above-mentioned effects, it is also possible to confirm the occurrence of abnormal noise and vibration.
- the source can be easily identified.
- the sound and vibration analysis device of the present invention includes a conversion unit that converts data of the sound reproduced by the reproduction unit into a file having a preset data format.
- the sound and vibration analysis device of the present invention it is possible to convert sound data reproduced by the sound and vibration analysis device into a file format that can be read by another device, and save the converted data. To check for abnormal noise. Therefore, it is possible to confirm the generation of abnormal noise and vibration and to identify the source of the noise and vibration regardless of the place and time, and it is easy to take measures against abnormal noise and vibration.
- a sound and vibration analysis method for capturing data of the number of rotations of a body and performing a sound and vibration analysis comprising: a frequency analysis step of performing a frequency analysis on the sound or vibration data to calculate a frequency of the plurality of rotating bodies; An order conversion step of calculating an order in accordance with specifications of the plurality of rotating bodies based on frequency data of the plurality of rotating bodies; A speed conversion step of calculating the speed of the vehicle based on data of the number of rotations of the body; and displaying a sound pressure level obtained based on the sound or vibration data in association with the order and the speed of the vehicle.
- a sound vibration analysis method including a display step of performing
- the sound and vibration analysis method of the present invention when sound or vibration is generated from a plurality of rotating bodies provided in a power transmission mechanism of a vehicle, an order associated with the sound or vibration is calculated, and the sound or vibration is calculated. Is displayed on the display means in association with the previously calculated order vehicle speed. For example, the order of a sound generated from a rotating body is determined by the number of teeth of the rotating body. Therefore, by examining the order associated with the sound, the rotating body that is the source of the sound is specified.
- the order of sound or vibration is calculated based on the measured data, and the sound pressure level with respect to the calculated order and the vehicle speed is displayed.
- the source of abnormal noise and vibration can be specified. Therefore, the source of the abnormal noise and vibration can be easily and reliably identified, so that the man-hours for replacing or adjusting parts and the like can be reduced.
- the sound vibration analysis method of the present invention preferably includes a reproduction step of reproducing a sound including a specific order when reproduction of the sound including the specific order is selected based on the display performed in the display step.
- the reproducing step includes: reproducing an original sound composed of the sound or vibration data; reproducing a sound including the specific order; or a sound including the specific order from the original sound. It is desirable that the step is to selectively execute any one of the sound reproductions excluding the above components.
- the original sound is almost equal to the sound emitted from the vehicle or the power transmission mechanism at the time of measurement, and the sound containing a specific order corresponds to the abnormal noise generated from the power transmission mechanism.
- the sound obtained by removing the components of the sound including the specific order from the original sound is almost equal to the sound emitted by the vehicle or the power transmission mechanism after the source of the abnormal noise is removed. Therefore, it is easier to identify the source of the sound by comparing the sounds.
- the original sound, the specific component, and the sound obtained by removing the specific component from the original sound can be selectively reproduced. Listening and confirmation of the condition after the source of abnormal noise is removed is possible. Therefore, it is easier to confirm the generation of abnormal noise and vibration, and to identify the source.
- a power transmission mechanism of a vehicle having a plurality of rotating bodies when operated, data of sound or vibration generated with the rotation of the plurality of rotating bodies, and a rotation selected from the plurality of rotating bodies.
- a sound and vibration analysis program for taking data of the number of rotations of a body into a computer and executing a sound and vibration analysis, wherein the frequency of the sound or vibration data is analyzed to calculate the frequencies of the plurality of rotating bodies.
- a frequency analysis step an order conversion step of calculating an order corresponding to the specifications of the plurality of rotating bodies based on data of the frequencies of the plurality of rotating bodies; and
- a sound and vibration analysis including a speed conversion step of calculating a speed of a vehicle, and a display step of displaying a sound pressure level acquired based on the sound or vibration data in association with the order and the speed of the vehicle.
- the order corresponding to the sound and vibration generated from the plurality of rotating bodies provided in the power transmission mechanism of the vehicle is calculated, and the sound or vibration is calculated.
- the obtained sound pressure level is displayed on the display means in association with the previously calculated order and vehicle speed. For example, the order of the sound generated from the rotating body is determined by the number of teeth of the rotating body. Therefore, if the order associated with the sound is examined, the rotating body that is the source of the sound is specified.
- the sound and vibration analysis can be performed only by executing the sound and vibration analysis program recorded on the recording medium by a computer, thereby generating abnormal noise and vibration.
- the source can be identified.
- a computer-readable recording medium that takes in data of the number of rotations of a body into a computer and executes sound vibration analysis, wherein the sound or vibration data is subjected to frequency analysis to calculate frequencies of the plurality of rotating bodies.
- a speed conversion step of calculating the speed of the vehicle, and based on the sound or vibration data.
- the program for sound and vibration analysis recorded on the computer-readable recording medium of the present invention When the program for sound and vibration analysis recorded on the computer-readable recording medium of the present invention is read and executed by a computer, it can deal with sounds and vibrations generated from a plurality of rotating bodies provided in a power transmission mechanism of a vehicle.
- the order to be assigned is calculated, and the sound pressure level obtained based on the sound or vibration is displayed on the display means in association with the previously calculated order and vehicle speed.
- the order of the sound generated from the rotating body is determined by the number of teeth of the rotating body. Therefore, if the order associated with the sound is checked, the rotating body that is the sound source is specified.
- Such a sound vibration analysis program may be stored in a computer in advance, or may be downloaded via a network.
- a sound-vibration analysis can be performed only by making a computer execute the program for sound-vibration analysis, and the source of abnormal noise and vibration can be specified.
- FIG. 1 is a conceptual diagram illustrating measurement of abnormal noise by the sound and vibration analysis device of the present invention.
- FIG. 2 is a block diagram showing the configuration of the sound and vibration analysis device.
- FIG. 3 is a flowchart showing processing of the sound and vibration analysis device.
- FIG. 4 is a diagram showing a menu screen.
- FIG. 5 is a diagram showing a signal analysis screen.
- FIG. 6 is a diagram showing an order analysis screen.
- FIG. 7 is a diagram showing a filter processing screen.
- FIG. 8 is a diagram showing a sound data recording screen. BEST MODE FOR CARRYING OUT THE INVENTION
- the object to be inspected in this embodiment is the automobile 1, more specifically, the transmission 2 of the automobile.
- the transmission 2 has a first shaft 4 that is rotationally driven by the engine 3 as a drive source.
- a first speed drive gear 5 having 10 teeth and a second speed drive gear 6 having 15 teeth are attached to the first shaft 4 in parallel.
- the first-speed drive gear 5 has a first-speed driven gear (rotator) 7 having 20 teeth
- the second-speed drive gear 6 has a second-speed driven gear 8 having five teeth. are doing.
- the first speed driven gear 7 and the second speed driven gear 8 are both mounted on the second shaft 9.
- a final drive gear 10 having ten teeth is attached to the second shaft 9.
- the fine drive gear 10 is combined with the final driven gear 11.
- the final driven gear 11 is attached to the third shaft 12.
- a drive wheel 13 is attached to an end of the third shaft 12.
- the second shaft 9 and the third shaft 12 are arranged parallel to the first shaft 4.
- a clutch (not shown) is provided on the first-speed drip gear 7 and the second-speed drip gear 8.
- the clutch provided on the second-speed driven gear 8 is disconnected, the second-speed driven gear 8 idles, and the rotation of the engine 3 is reduced to the first-speed drive gears 5 and 1.
- the power is transmitted to the third shaft 12 and the drive wheels 13 via the high speed driven gear 7 and the final drive gear 10.
- the clutch provided on the first speed driven gear 7 is disengaged, the first speed driven gear 7 idles, and the rotation of the engine 3 is reduced to the second speed drive gear 6, the second speed driven gear 8, and the final speed.
- the power is transmitted to the third shaft 12 and the drive wheels 13 via the drive gear 10.
- a sound collecting microphone 14 that captures the sound generated by the transmission 2 and the sound generated by the engine 3 and other devices, and a recorder 16 that records the sound captured by the sound collecting microphone 14 Have been.
- the test driver who performs the sensory test while actually driving the car 1 speaks what is felt during driving as a comment, and this sound is also taken into the sound collecting microphone 14.
- Recorder 16 has sound collecting microphone 14 The captured sound is recorded as sound data over time.
- the sound generated by the transmission 2 is generated when the shafts 4, 9 and the gears 5, 6, 7, 8, 8, 10, 11 rotate, and when the gears mesh with each other. There are various sounds. Among these sounds, sounds exceeding a predetermined sound pressure level (dB) are regarded as abnormal sounds described above.
- a pulse sensor 15 is attached at a position facing the outer peripheral teeth of the first speed driven gear 7 attached to the second shaft 9.
- the pulse sensor 15 is a semiconductor sensor that detects the rotation speed of the first-speed driven gear 7 selected for detecting the rotation speed of the second shaft 9.
- the pulse sensor 15 outputs a rectangular pulse signal when the first-speed driven gear 7 rotates and individual teeth formed on the outer periphery thereof approach or separate from the pulse sensor 15.
- the pulse signal output from the pulse sensor 15 is recorded on the recorder 16 as pulse signal data.
- the recorder 16 synchronizes the sound data with the pulse signal data and records the data as a single data file on a recording medium.
- the order of each of the gears 7, 8, and 10 is determined based on one rotation of the second shaft 9 on which the first-speed driving gear 7 for detecting the rotation speed by the pulse sensor 15 is attached. , The second-speed driven gear 8, and the final drive gear 10).
- the first-speed driven gear 7 is a gear having 20 teeth
- the second shaft 9 has rotated once. That is, while the second shaft 9 makes one rotation, the first-speed driven gear 7 engages with the first-speed drive gear 5 and 20 teeth, so the order of the first-speed driven gear 7 is set to the 20th order.
- the second-speed drive gear 8 has the fifth order because the second-speed drive gear 6 and the five teeth engage with each other.
- the final drive gear 10 has ten orders because the final driven gear 11 and ten teeth are engaged during one rotation of the second shaft 9.
- the second shaft 9 rotates 100 times Z
- the first-speed driven gear 7 having 20 teeth engages with the first-speed drive gear 5 while rotating in 100 rotations per second
- the pulse sensor 15 emits 200 pulses per second. Since the signal is output 0 times, the frequency at this time is 200 OHz. If the rotation speed of the second shaft 9 becomes 50 rotations / second, the frequency of the first-speed driven gear 7 becomes 100 Hz.
- the frequency changes according to the rotation speed of the shaft, but the order is constant regardless of the rotation speed of the shaft. Therefore, by performing data processing focusing on the order as in the present embodiment, stable analysis can be performed regardless of the number of rotations.
- the sound and vibration analyzer 20 includes a reader 21 for reading a data file from a recording medium, a display 22 such as a display, and a speaker 23 for reproducing sound.
- This is a computer including a storage device 24 for storing data, an input device 25 such as a keyboard and a pointing device, and a control device 26 including a central processing unit.
- the sound and vibration analyzer 20 may include a plurality of readers 21 according to the type of the recording medium.
- the speaker 23 includes an amplifier circuit for amplifying a digital signal, a converter for converting an analog signal, and the like.
- the control device 26 realizes various data processing by expanding and activating the application program for sound and vibration analysis stored in the storage device 24 in the central processing unit and the memory.
- control device 26 uses an application program for sound and vibration analysis to execute an extraction unit 31, a sound and vibration calculation unit 32, a speed calculation unit 33, an order calculation unit 34, a display control unit 35 and an input process Functions as the unit 36 and the extracting unit 37.
- the extraction unit 31 extracts sound data and pulse signal data from the read data file.
- the extracted sound data and pulse number data are converted into frequency data and sound pressure data in the sound vibration calculating section 32.
- the frequency data is data obtained by performing frequency analysis (fast Fourier transform) on sound data.
- the sound pressure data is obtained by calculating the sound pressure from the magnitude of the sound amplitude in the frequency data and calculating the sound pressure level that is the logarithmic ratio to a reference sound pressure (for example, the sound pressure of the entire sound). It has a data structure in which the frequency and the rotation speed of the second shaft 9 are associated with the sound level of the sound specified thereby.
- the pulse signal data is converted into a rotation speed and a vehicle speed in the speed calculation unit 33.
- the vehicle speed is obtained by multiplying the rotation speed by a predetermined coefficient, but this coefficient varies depending on the diameter / gear ratio of the driving wheel 13.
- a coefficient stored in advance is selected and used, or a value input by an operator is used.
- the order calculator 34 calculates the order by dividing the frequency of the sound by the number of rotations from the frequency data and the pulse signal data.
- the order obtained by this processing is set as order data in association with time, frequency, sound pressure level, rotation speed of the second shaft 9, and vehicle speed of the automobile 1.
- the order calculated from the actually recorded sound in this way is the order specific to each gear determined by the number of teeth (specifications) of each gear of transmission 2 (eg, gears 7, 8, 10). Is equivalent to For this reason, if the order of a sound that is equal to or higher than a predetermined sound pressure level among the sounds recorded during traveling is calculated, gears that cause abnormal noise (for example, gears 7, 8, and 10) Can be specified.
- the order data has a data structure in which the frequency and the number of rotations are associated with the order specified by the order, and the order data is tl.
- the display processing of the calculation result is performed by the display control unit 35.
- the input processing unit 36 processes an operation input by the operator using the input device 25.
- the extraction unit 37 performs a process of extracting the corresponding sound from the order data.
- the conversion unit 38 converts the sound data extracted by the extraction unit 37 and reproduced by the speaker 23 into a file format that can be read by another device.
- being readable means that a file can be opened on another device to display data on a screen, or that sound can be reproduced with the speed of another device.
- the vehicle 1 is actually driven, and voice data and pulse signal data are acquired.
- the test driver performs sensory tests while gradually changing the speed, and records the actual driving feeling.
- Audio data or paper media is used as a recording medium for recording the results of the sensory test. For example, if the test driver hears abnormal noise when the vehicle speed is around 55 km / h or around 60 km / h while the vehicle is slowly accelerating at 2nd speed, this is indicated by the recorder 16 or paper. Recorded on the medium. When the actual running is completed, remove the recording medium from the recorder 16. Sound and vibration analyzer 20 Is performed according to the flowchart of FIG.
- Step S 1 the data file recorded on the recording medium is read by the reader 21 (Step S 1), and the sound and vibration calculation unit 32 performs frequency analysis (Step S 2).
- Step S 2 the rotation speed of the transmission 2 of the vehicle 1 is converted into the vehicle speed by the speed calculation unit 33 as necessary (step S3).
- step S4 the order calculator 34 performs order conversion according to the specifications of the gears 7, 8, and 10 (step S4), and the calculation results are displayed and controlled. This is displayed on the display device 22 by the unit 35 (step S5).
- sound data is reproduced based on the calculation result (step S6).
- step S7 data conversion is performed by the conversion unit 38 as necessary, and the data is converted into a format that can be read by another computer (step S7).
- the display device 22 assists the processing selected on the menu screen for selecting various types of processing and the menu screen and displays the processing result. Is displayed.
- Figure 4 shows an example of this menu screen.
- the menu screen 41 reads the data file and displays each data.
- the menu screen 41 includes a signal analysis button 42 selected when performing frequency analysis of sound data, an order analysis button 43 selected when performing order analysis, and a readout from a recording medium.
- a sound data recording button 44 for recording a data file in a general-purpose format or creating a data file for frequency analysis, and an end button 45 for terminating an application program are provided. Workers use the keyboard or pointing device to operate buttons, select icons, enter letters or numbers in text boxes, and move the cursor.
- the input result or the operation result is to be reflected on various processes, screen display, or sound output via the input processing unit 36.
- the signal analysis screen 51 as shown in Fig. 5 is displayed, allowing you to read files, display graphs, and record data. Become. As shown in Fig. 5, in the center of the signal analysis screen 51, the pulse signal (voltage) output from the pulse sensor 15 is displayed on the horizontal axis as the time elapses during the inspection. 2, a sound graph 53 showing a change in sound (voltage), a rotation graph 54 showing a change in rotation speed (rpm) of the second shaft 9, and a frequency ( A frequency graph 54 indicating a change in Hz) and a frequency graph 55 plotting a frequency of a sound recorded in the recorder 16 with respect to a change in time during actual running are provided.
- Each of these graphs has a time axis on the horizontal axis, and is arranged from top to bottom in the above order with the pulse signal data graph 52 at the top, and arranged so that the time axes coincide.
- Each plot of the frequency graph 55 is color-coded according to the magnitude of the sound pressure level (dB) calculated by the sound vibration calculation unit 32.
- the frequency graph 55 shows the time from the start of the detection, the frequency of the sound generated at that time, and the sound pressure level (tone color). Black or dark blue is assigned to the low sound pressure level, and colors with gradually higher brightness, such as blue, red, and yellow, are assigned as the sound pressure level increases.
- the area with the highest sound pressure level is assigned white color.
- the correspondence between the sound pressure level and the displayed color can be confirmed by the scale 56 arranged on the right side of the wave number graph 55.
- Items displayed in the status area 57 include information indicating the current processing (for example, “Reading”, “Processing”, “Waiting”, “Saving”, etc.) and data files. File name, date of measurement, commenter's name and comment, sample rate of sound data and pulse signal data, and number of selected data.
- the parameter area 58 is used to plot the signal contained in the acquired data. You can select whether to trigger at the rising edge or falling edge of the signal, and set or select the start and end points of the graph display time, the minimum and maximum values of the frequency, and so on.
- a file reading button 59a for reading a file is arranged, and below the file reading button 59a is temporarily used for frequency analysis of the graph-displayed data.
- a data save button 59 to save data in the storage device 24 is arranged.
- an end button 59 c for closing the signal analysis screen 51 is arranged.
- the interval between the end button 59c and the data save button 59b is made larger than the interval between the file read button 59a and the data save button 59b. This is to prevent erroneous operations of b and 59c. From the viewpoint of preventing erroneous operation, the color and size of each button 59a, 59b, 59c may be different (the same applies to other end buttons).
- a text storage button 60 for storing the pulse signal data and the sound data displayed in the pulse signal data graph 52 is arranged.
- the data storage format is text format, and the range of data storage can be set with the start cursor 61 a and the end cursor 61 b using the time axis as a parameter.
- a tool area 62 in which icons are arranged is arranged.
- icons having functions of changing the form of the graph display and enlarging or reducing the graph display are displayed.
- the change of the display form of the graph is realized by cooperation of the input processing unit 36 and the display control unit 35.
- the data file created by selecting the sound data recording button 44 is read (step S1 in Fig. 3).
- the pulse signal data and the sound data are extracted from the read data file by the extraction unit 31, and a pulse signal data graph 52 is displayed from the pulse signal data, and a sound graph 53 is displayed from the sound data. Is displayed.
- the speed calculation unit 33 calculates the rotation speed from the pulse signal data, and the calculation result is displayed on a rotation speed graph 54.
- frequency analysis is performed based on the frequency and the sound pressure level calculated from the sound data (step S2 in FIG. 3), and the result is displayed as a frequency graph 55.
- the order analysis button 4 3 After finishing the signal analysis screen 51, select the order analysis button 4 3 from the menu screen 41 shown in Fig. 4, and the order analysis screen 71 shown in Fig. 6 is displayed.
- Order analysis such as graph display and filter setting becomes possible.
- the sound graph 72 showing the change of sound over time
- the frequency graph 73 showing the change of the sound frequency over time
- the order analysis An order graph 74 showing the change of the order obtained is provided.
- Each of these graphs has a time axis on the horizontal axis, and is arranged from top to bottom in the above order with the sound graph 72 as the uppermost row, and arranged so that the time axes coincide.
- Each plot of the frequency graph 73 and the order graph 74 is color-coded according to the magnitude of the sound pressure level.
- the correspondence between the sound pressure level and the displayed color can be confirmed by the scale 75 arranged on the right side of the graph 74 (the same applies to each graph below).
- a graph 76 for displaying frequencies in a spectrum is arranged.
- the color is brighter (the sound pressure level is higher) in the area of the lower order, and the color is darker (lower the sound pressure level) in the area of the higher order.
- a portion 74a (shown by a black line in FIG. 6) that is lighter in color than other surrounding regions is displayed.
- a portion 74b (shown by a black line in FIG. 6) that is lighter in color than other surrounding regions is displayed in the upper right portion of the order graph 74.
- a rotation speed graph 77 indicating the change of the rotation speed with the passage of time is arranged.
- an order graph 78 showing the change of the order (vertical axis) with respect to the rotation speed (horizontal axis) is arranged.
- the data of the order daraf 78 are also plotted according to the scale 75 described above, with the colors assigned according to the magnitude of the sound pressure level.
- the order graphs 7 and 8 show the regions with small orders. Areas with brighter colors (higher sound levels) and darker colors (lower sound pressure levels) are displayed in higher order areas.
- a portion 78a shown by a black line in FIG.
- a status area 57 similar to the signal analysis screen 51 described above is arranged on the upper left side of the order analysis screen 71, and the lower part of each graph 72, 73, 74, 77, 78 is arranged below the same.
- a search area 79 where the coordinate information of the plot is displayed is arranged. When a specific point on the graph is pointed with a pointing device or the like, the frequency, order, rotation speed, and vehicle speed values are displayed in the display fields of the search area 79, according to the vertical and horizontal axes of the graph. Is displayed. Further, a button 80 for executing reading of data to be displayed on this screen and a button 81 for ending this screen are arranged at a lower left portion of the order analysis screen 71.
- the area from the bottom center to the right of the order analysis screen 7 1 has a filter setting area 8 2 for filtering data, an order range area 8 4 for setting the order range to be displayed on the order analysis screen 71 1, and rotation.
- a vehicle speed conversion area 85 for converting a number into a vehicle speed is arranged.
- the filter setting area 82 it is possible to set parameters for performing the filtering process and the horizontal axis and the vertical axis of the graph displayed after the filtering process.
- the time-frequency button 83a When the time-frequency button 83a is selected, filtering is performed using the frequency component as a parameter, and the change in frequency with respect to time is displayed in a graph.
- the time-order button 8 3 b When the time-order button 8 3 b is selected, filtering is performed using the order component as a parameter, and the change of the order with respect to time is displayed in a graph.
- the number-of-rotations-order button 8 3 c filtering is performed using the order component as a parameter, and the change in order with respect to the number of rotations is displayed in a graph.
- the order range to be displayed on the order analysis screen 71 can be selected by its start value and end value.
- Start field where the start value is entered 8 In 4a an increase button for increasing the number in the text box and a decrease button for decreasing the number in the text box are arranged next to the text box in which numbers can be entered.
- end field 84b where the end value is input, a numerical value increase button and a decrease button are arranged next to a text box in which a number can be input.
- the vehicle speed conversion area 85 includes a setting column 85a for setting a coefficient used for converting the vehicle speed, and an execution button 8 for converting the vehicle speed of the automobile 1 from the set coefficient and the rotation speed.
- a numerical value increasing button and a numerical value decreasing button are arranged next to a text box for inputting a coefficient.
- the coefficient set in the setting column 85a is obtained by multiplying the ratio of the rotation speed of the second shaft 9 detected by the pulse sensor 15 to the rotation speed of the driving wheel 13 by the circumference of the driving wheel 13 Value.
- the circumference of the drive wheel 13 is obtained by multiplying twice the radius of the drive wheel 13 by the pi.
- Such a coefficient is set based on the number of shafts 4 and 9 of the transmission 2 and other speed reduction gear trains (not shown). Even in such a case, the rotation speeds of the shafts 4 and 9 and the rotation speeds of the drive wheels 13 may not match. Further, since such a coefficient differs for each vehicle 1, it is preferable that the operator can appropriately set the coefficient. Note that the rotational speed at which the drive wheels 13 actually rotate is proportional to the speed of the vehicle 1.
- the sound graph 7 2 and the frequency graph 7 3 are displayed by the display control unit 35 based on the data of the file saved on the signal analysis screen 5 1 (see FIG. 5).
- a graph 76 of the frequency spectrum is displayed.
- the time change of the rotation speed is calculated from the pulse signal data, and is displayed in a graph 77.
- the order of the sound is calculated from the frequency data by the order calculator 34 (step S4 in FIG. 3).
- the calculation result is displayed on the order graphs 74 and 78 by the display control unit 35 (step S5 in FIG. 3).
- a sound graph 92 showing a change in sound with respect to time before the filter processing and an order graph 93 showing a change in order with respect to the vehicle speed are shown. It is arranged up and down.
- a sound graph 94 showing a change in sound with respect to time after the filter processing and an order graph 95 showing a change in order with respect to the vehicle speed are arranged vertically.
- the graph before filtering and the rough after filtering are arranged side by side in the horizontal direction of the screen (the sound graph 92 and the sound graph 94, the order graph 93 and the order graph 95).
- Each plot of the order graphs 93 and 95 is color-coded according to the magnitude of the sound pressure level. The correspondence between the magnitude of the sound pressure level and the displayed color can be confirmed on the scale 96 on the right side of the degree graph 95 after the filtering.
- a part 9 3a that is lighter in color than other surrounding areas is displayed.
- a part 9 3a that is lighter in color than other surrounding areas is also displayed.
- 3 b is displayed.
- the central part of the order graph 95 shows a part 95a that is lighter in color than the other surrounding areas, and the upper right part of the graph also has a brighter part than the other surrounding areas. Bright parts 9 5b are displayed.
- These parts 93a, 93b, 95a, and 95b indicate the occurrence of abnormal noise.
- a status area 57 is arranged on the upper left side of the filter processing screen 91, and a reproduction setting area 97 operated when outputting a specific sound from the speaker 23 is arranged below the status area 57.
- the playback setting area 97 includes a selection unit field 98 for selecting the type of parameter of interest when outputting from the speaker 23, a selection value field 99 for inputting a parameter value, and a center value based on the selected value.
- Band width field 100 to set the width of the order or frequency to be extracted, scale 100 to adjust the value of the band width, parameter selected in the selection unit field 98 and the selection value field 99
- the selection type field 103 and the selection list field 103 display the parameter type and value.
- An additional button 104 is provided.
- a pull-down button for displaying the types of selectable parameters is arranged next to a text box for inputting the parameter name.
- a numerical value increasing button and a numerical value decreasing button are arranged next to a text box for inputting a parameter value.
- a numerical value increase button and a decrease button are arranged beside the text box.
- the scale 101 is provided with a cursor 102 for adjusting the value of the bandwidth. In FIG. 7, the band width for moving the cursor 102 to the left increases, and when the cursor 102 moves to the right, the band width decreases.
- the selection list column 103 displays the type of the parameter selected in the selection unit column 98 and the value of the parameter selected in the selection value ⁇ 9.
- the additional button 104 arranged next to the selection unit column 98 is selected, the type and value of the parameter are displayed in the selection list column 103.
- the additional button 104 is also selected.
- the check button 105a is provided with the notation of the original sound (Origina1).
- the check button 105b has a notation of a specific component (Selec ted), and the check button 105c has a notation of a non-special component (exceptd).
- the original sound check button 105a is selected when the sound before the filter processing is output as it is.
- the check button 105b of the specific component is selected when outputting only sounds extracted under one or more conditions selected from the conditions listed in the selection list field 103.
- the check button 105c other than the specific component is selected when outputting the remaining sound excluding the sound extracted as the specific component from the original sound.
- each check button 105a, 105, 105c there is a play button 106 for outputting the selected sound only once from the speaker 23, and a selected sound for the selected sound.
- a continuous button 108 for repeatedly outputting and a stop button 107 for stopping output are arranged.
- the sound selected by the reproduction button 106 is output once in order.
- the continuous button 108 the selected Each of the extracted sounds is repeatedly output in order (step S6 in FIG. 3).
- a return button 109 is arranged below the reproduction setting area 97. When the return button 109 is selected, the filter processing screen 91 is ended and the screen can return to the order analysis screen 71 in FIG.
- the sound pressure level value (tone) in the order graph 93 before filtering or the order graph 95 after filtering is compared with the surroundings. It is advisable to select a value that corresponds to a significantly different part (part 93a or part 95a, or part 93a or part 95b). For example, if a part where the sound pressure level is higher than the surroundings appears near the order 67.5 near the vehicle speed of 60 km / h, the order is selected as the unit and the selected value 67.5 is set.
- the characteristic component of the radio box 105b is checked, a sound corresponding to the order 67.5 and a bandwidth centered on the order 67.5 is extracted by the bandpass filter.
- the sound corresponding to the order 67.5 and the bandwidth centered on the order 67.5 is removed by a band elimination filter or the like.
- the test driver it is better to refer to the information recorded by the test driver in the voice or memo during actual driving. That is, if the information from the test driver is, for example, "sound generation at a speed of 60 kmZh at the 2nd speed", the portion before and after the speed of 60 kmZh in the order graph 93 may be examined. In this way, by displaying the order graph 93 with the abscissa representing the vehicle speed on the filter processing screen 91, it becomes easy to correlate the information obtained during actual traveling with the analysis results.
- the play button 106 or the continuous button 108 can be selected (active)
- an area having a predetermined band width around the selected value 67.5 is selected.
- the sound of the included order is extracted by the extraction unit 37 and output from the speaker 23.
- the sound in the range delimited by the start cursor ⁇ ⁇ ⁇ 10a and the end cursor 1110b displayed on the sound graph 94 is reproduced once.
- the continuous button 108 is selected, the sound in the range delimited by the two cursors 110a and 110b is repeatedly reproduced.
- the stop button 107 becomes active. Get active When the stop button 107 is selected, playback can be stopped in the middle or continuous playback can be stopped.
- the sound and vibration analyzer 20 converts the data file of the recording medium read by the reader 21 into a data file conforming to each of the above-described processes, and converts the sound of the specific component into a general-purpose data format. It has a sound data recording function for recording. This sound data recording function is realized by the conversion unit 38, which enables data processing by a computer and makes it possible to refer to the analysis result in another department at a remote location.
- the general-purpose data format is compatible with the OS (Operation System) of computers owned by other departments, and is a storage format suitable for sound storage and playback. For example, wa V format, au format, aiff format and mp3 format.
- a sound data recording screen 1 21 as shown in FIG. 8 is displayed on the screen.
- a sound graph 1 2 2 is arranged from the center of the screen to the right side, and the sound data read from the recording medium and the sound data extracted as the sound of the specific component are displayed in a graph. Is done.
- the horizontal axis of the sound graph 122 is time, and the vertical axis is frequency.
- the plot of the sound graph 1 2 2 shows the large sound pressure level. It is color-coded according to the size. The correspondence between the sound pressure level and the displayed color can be confirmed on the scale 123 on the right side of the sound graph 122.
- a spectrum graph 124 showing a change in frequency is arranged on the left side of the sound Daraf 122.
- a sound graph 125 indicating a change in the voltage value of the sound with respect to time is arranged below the sound graph 122.
- an editing area 126 for editing data is arranged below the sound data recording screen 122.
- a frame length field 127 for setting the data frame length a window type field 128 for setting the type of window function, and sound and rotation speed can be set as the type of signal to be recorded.
- the signal type columns 129 are arranged side by side from top to bottom.
- a pull-down button for displaying a preset option in a selectable manner is arranged next to a text box in which a numerical value can be directly input.
- the editing area 126 includes a sample number field 130 for selecting or displaying the number of points to be extracted as a sample, and a storage number field 131 for displaying the number of points saved as a data file.
- the ratio of the stored data amount to the entire data amount is displayed on the packing display unit 132. In the backlog display section 132, the current stored data ratio is displayed as a graph, with the left end being 0% and the right end being 100%.
- a status area 57 is arranged on the upper left side of the sound data recording screen 1 2 1.
- a start button 133 for reading sound data of a specific component and a data recording are executed.
- Save button 1 34 is placed.
- a file conversion button 135 for converting the stored data into a preset general-purpose file format is provided at the lower left portion of the sound data recording screen 1 2 1.
- the file format for conversion can be selected using the configuration button 136.
- the data format is converted (step S7 in FIG. 3). In order to prevent erroneous operation of the buttons 135, 136, and 137 below the configuration button 136, leave an interval larger than the interval between the file conversion button 135 and the configuration button 136, and finish. Buttons 1 3 7 are arranged.
- the data file created in this way can be attached to an e-mail, or using FTP (File Transfer Protocol), etc.
- the file is sent to another computer connected to the network.
- Other computers are equipped with an application for playing a sound board and playing back a data file read from a recording medium or a data file obtained via a network to display the contents or display sound files. Or to play.
- the preset general-purpose file format is a file format that can be used by other computers utilizing the data file.
- abnormal noise when abnormal noise is generated in the transmission 2, such abnormal noise is recorded in data and displayed in a graph, so that the cause of the discontinuous noise can be analyzed. Will be possible.
- the abnormal noise When the abnormal noise is displayed graphically, its frequency is converted into a variable (order) proportional to the number of teeth of each gear 7, 8, 10 based on the rotation speed of the second shaft 9, so that the change in rotation speed
- the gears 7, 8, and 10 in which abnormal noise has occurred can be reliably identified regardless of the noise.
- the frequency and order graphs are plotted in different colors according to the sound pressure level, it is easy to visually check the speed, rotational speed, order, or frequency at which abnormal noise occurred. can do.
- the order and sound pressure level are displayed in association with the vehicle speed, it is easier to match the test driver's experience with the analysis results during driving inspection, and when abnormal noise is generated under specific conditions However, it is possible to easily identify the gear that is the factor. Since the data of a specific order or frequency is displayed in an oily manner, the accuracy of analysis is improved even if there is a sound with a similar frequency.
- the filtering process and the playback process can filter the entire sound and output a sound corresponding to a specific order or frequency from the sound force 23. Can be confirmed.
- the sound corresponding to a specific order is removed from the speaker 23, the sound after the target gear 7, 8, 10 has been replaced can be foreseen. Become. Even if there are multiple causes of abnormal noise, it is possible to individually verify the causes. When the source of the abnormal noise is identified in this way, it is not necessary to perform the so-called cross-check, that is, rearrange the components estimated as before and check the event again. Can be.
- the object to be inspected may be any device that may generate abnormal noise or vibration when a plurality of rotating bodies included in the moving body rotate, and may be a single transmission.
- the moving object is not limited to an automobile (two-wheeled vehicle, three-wheeled vehicle, four-wheeled vehicle), but may be a train.
- the engine may be a differential gear of an automobile.
- the rotating body include a rotating disk, a frame, and a roller.
- a vibration pickup may be attached to the inspection object to acquire vibration data generated during operation of the inspection object, analyze the frequency of the vibration, and perform order analysis.
- the sound vibration calculation unit 32 of the sound vibration analysis device 20 is a vibration calculation unit that calculates the frequency of the vibration and the sound pressure level of the vibration from the vibration data.
- the sound pressure level is calculated as a logarithmic ratio of a specific frequency to a maximum value of the vibration.
- the sound graph (for example, the graph 53 in FIG. 5) is displayed by the display control unit 35 as a graph of the vibration.
- the sound output from the speaker 23 is a sound corresponding to the vibration. If the vibration is accompanied by a human audible sound, a sound corresponding to this is output.
- An application program for sound vibration analysis that causes a computer to function as the sound vibration analysis device 20 may be stored in the storage device 24 shown in FIG. 2 in advance, or may be read from a recording medium as necessary. Alternatively, it may be downloaded from the network.
- the recording medium is a medium in which the application program is recorded so as to be readable by the reader 21.
- the application program in these cases causes the computer to execute steps S1 to S7 as shown in FIG. In particular, in the reproduction process of step S7, the original sound, the specific component, and the component other than the specific component can be selected, and a process of reproducing any one of the sounds according to the operation of the operator is performed. It is good to configure the program to do so.
- Such an application program may be uploaded to a network so that it can be downloaded, or a processing circuit capable of performing each of the above-described steps S1 to S7 may be detachably mounted on a computer. It may be composed of cards.
- the computer may perform only signal processing for reproducing the sound, and output the sound from an external speaker separate from the computer.
- the display device 22 may display the screens 41, 51, 71, 91, 121 on an external display device separate from the computer.
- the menu screen 41 is always displayed while the application for sound and vibration analysis is running, but menus with the same functions as the menu screen 41 are displayed on each screen 51, 71, 91, 1 2 1 May be provided.
- the color of the area corresponding to the selected order is changed, or the area is surrounded by a »line to visually observe the area selected by the operator. You may make it possible to confirm it.
- the format of the data file created in the sound data recording process may be a text format or a CSV (Comma Separate te vD alu e) format. The same applies when handling vibration data.
- CSV Common Separate te vD alu e
- a sound and vibration analysis device that performs sound and vibration analysis by taking in data of the number of rotations of a body, wherein a frequency analysis unit that performs frequency analysis on the sound or vibration data to calculate frequencies of the plurality of rotating bodies, Based on frequency data of multiple rotating bodies
- Order conversion means for calculating an order according to the specifications of the plurality of rotating bodies; speed converting means for calculating the speed of the vehicle based on data on the number of rotations of the rotating body; and data of the sound or vibration.
- a display unit for displaying a sound pressure level acquired based on the vehicle speed in association with the order of the vehicle.
- the order of sound or vibration is calculated, and the sound pressure level corresponding to the calculated order or vehicle speed is displayed. Therefore, generation of abnormal noise or vibration generated according to a change in vehicle speed is generated.
- the source can be identified. Also, since it is easy to match with the sensory test, it is easy to confirm the generation of abnormal noise and vibration and to identify the source of the noise and vibration. In addition, since the source of abnormal noise and vibration can be reliably identified, it contributes to a reduction in man-hours for replacement work.
- the source of abnormal noise and vibration can be specified by the order that does not depend on the number of revolutions of the rotating body, so even if there are multiple rotating bodies with similar frequencies, the source of abnormal noise and vibration can be determined well. Go. .
- a sound and vibration analysis method for capturing data of the number of rotations of a body and performing a sound and vibration analysis comprising: a frequency analysis step of performing a frequency analysis on the sound or vibration data to calculate a frequency of the plurality of rotating bodies; An order conversion step of calculating an order in accordance with the specifications of the plurality of rotating bodies based on frequency data of the plurality of rotating bodies; and calculating a speed of the vehicle based on data of the number of rotations of the rotating body.
- the present invention relates to a sound and vibration analysis method including a speed conversion step and a display step of displaying a sound pressure level acquired based on the sound or vibration data in association with the order or speed of the vehicle.
- the order of sound or vibration is calculated based on the measured data, and the sound pressure level corresponding to the calculated order and vehicle speed is displayed.
- the source of the vibration can be specified. Therefore, the source of the abnormal noise and vibration can be easily and reliably specified, and the man-hours for replacement work and adjustment work of parts and the like can be reduced.
- a power transmission mechanism of a vehicle having a plurality of rotating bodies when operated, data of sound or vibration generated with the rotation of the plurality of rotating bodies, and a rotation selected from the plurality of rotating bodies.
- Computerized data of body rotation and sound analysis A frequency analysis step of frequency-analyzing the sound or vibration data to calculate the frequencies of the plurality of rotating bodies; and An order conversion step of calculating an order corresponding to the specifications of the plurality of rotating bodies based on the data; a speed converting step of calculating the speed of the vehicle based on data on the number of rotations of the rotating body; and the sound or vibration.
- a computer-readable recording medium that takes in data of the number of rotations of a body into a computer and executes sound vibration analysis, wherein the sound or vibration data is subjected to frequency analysis to calculate frequencies of the plurality of rotating bodies.
- sound and vibration analysis can be performed only by executing a sound and vibration analysis program on a computer, and a source of abnormal noise and vibration can be specified.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/567,996 US7401000B2 (en) | 2003-08-28 | 2004-08-27 | Acoustic vibration analyzing apparatus and acoustic vibration analyzing method, program for analyzing acoustic vibration, and recording medium, readable by computer, on which program for analyzing acoustic vibration is stored |
EP04772734A EP1686359A4 (en) | 2003-08-28 | 2004-08-27 | SOUND / VIBRATION ANALYSIS DEVICE AND SOUND / VIBRATION ANALYSIS METHOD, AND SOUND / VIBRATION ANALYSIS PROGRAM, AND COMPUTER READABLE RECORDING MEDIUM ON WHICH A SOUND / VIBRATION PROGRAM IS RECORDED |
CA002535893A CA2535893C (en) | 2003-08-28 | 2004-08-27 | Acoustic vibration analyzing apparatus and acoustic vibration analyzing method, program for analyzing acoustic vibration, and recording medium, readable by computer, on which program for analyzing acoustic vibration is stored |
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JP2003-209353 | 2003-08-28 | ||
JP2003209353 | 2003-08-28 | ||
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JP2004-194413 | 2004-06-30 |
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Also Published As
Publication number | Publication date |
---|---|
EP1686359A1 (en) | 2006-08-02 |
CA2535893A1 (en) | 2005-03-10 |
EP1686359A4 (en) | 2009-07-08 |
JP2005098984A (ja) | 2005-04-14 |
CA2535893C (en) | 2009-06-30 |
US20070032968A1 (en) | 2007-02-08 |
US7401000B2 (en) | 2008-07-15 |
JP3853807B2 (ja) | 2006-12-06 |
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