CN202402268U - Device for diagnosing cavitation faults of water pump based on acoustic emission detection - Google Patents
Device for diagnosing cavitation faults of water pump based on acoustic emission detection Download PDFInfo
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Abstract
The utility model discloses a device for diagnosing the cavitation faults of a water pump based on acoustic emission detection. The device comprises an acoustic emission signal acquisition unit, two pressure sensors, a data acquisition unit and a diagnosis and processing unit; the acoustic emission signal acquisition unit and the pressure sensors are connected with the diagnosis and processing unit through the data acquisition unit respectively; the diagnosis and processing unit comprises a characteristic extraction unit for extracting acoustic emission characteristics according to input acoustic emission signals, a lift calculation unit for acquiring a water pump lift according to two paths of input water pressure, and a diagnosis unit for diagnosing cavitation faults of the water pump according to the acoustic emission characteristics and the water pump lift; and the characteristic extraction unit, and the lift calculation unit are connected with the input end of the diagnosis unit respectively. The device for diagnosing the cavitation faults of the water pump has the advantages of accurate detection result, high detection speed and efficiency, simplicity and convenience in operation, simple and compact structure, low cost and long service life.
Description
Technical field
The utility model relates to water pump failure diagnosis apparatus field, is specifically related to a kind of water pump cavitation trouble-shooter based on acoustic emission testing.
Background technique
The cavitation fault is one of more scabrous problem of water pump always.When water pump operation, at a certain regional area of flow passage components, when pressure dropped at that time the pairing pressure for vaporization of water temperature owing to reasons such as water flow velocity, flow losses near it, cavitation effect just can take place at this place in water.When flowing to the zone of high pressure with fluid, the cavitation bubble that cavitation effect produced sharply to crumble and fall; Produce pressure pulsation, the wetted surfaces formation high frequency erosion to flow passage components produces strong vibration and noise; Make the decreased performance of water pump, influence the safety and economic operation of equipment.Therefore, online detection and the fault diagnosis to water pump cavitation fault is crucial.
But; Also do not have at present practical and effective to detect diagnostic techniques and can realize early stage on-line monitoring and diagnosis water pump cavitation fault; Judge to have that testing result is inaccurate, detection efficiency low, the detection facility level of integration is low, the shortcoming of detecting operation complex steps often with self experience or through the parameter curve that supplementary instrument shows through the staff.
The model utility content
The technical problem that the utility model will solve provide a kind of testing result accurately and reliably, detect the water pump cavitation trouble-shooter based on acoustic emission testing of quick high rate, simple to operation, simple and compact for structure, with low cost, long service life.
In order to solve the problems of the technologies described above, the technological scheme that the utility model adopts is:
A kind of water pump cavitation trouble-shooter based on acoustic emission testing; Comprise the acoustic emission signal collecting unit that is used to gather the water pump acoustic emission signal, be used to detect two pressure transducers, data acquisition units of water pump suction side hydraulic pressure and outlet side hydraulic pressure and be used for according to said acoustic emission signal and hydraulic pressure diagnosis water pump cavitation fault and export the diagnostic process unit of diagnostic result; Said acoustic emission signal collecting unit, pressure transducer link to each other with the diagnostic process unit through data acquisition unit respectively; Said diagnostic process unit comprise be used for according to the acoustic emission signal of input extract characteristics of Acoustic Emission feature extraction unit, be used for two-way hydraulic pressure according to input and obtain the lift computing unit of pump head and be used for according to characteristics of Acoustic Emission and pump head diagnosis water pump cavitation Fault Diagnosis unit, said feature extraction unit, lift computing unit link to each other with the input end of diagnosis unit respectively.
Further improvement as technique scheme:
Said acoustic emission signal collecting unit comprises a plurality of calibrate AE sensors, and at least one calibrate AE sensor be adhered fixed on the pump housing of water pump suction side, at least one calibrate AE sensor is adhered fixed on the pump housing of exit of pump side.
Said acoustic emission signal collecting unit comprises that also the acoustic emission signal that is used for calibrate AE sensor output amplifies the preamplifier of filtration, and said calibrate AE sensor links to each other with data acquisition unit through preamplifier respectively.
A pressure transducer in said two pressure transducers is located in the pipeline of water pump suction side, and another pressure transducer is located in the pipeline of exit of pump side, and the layout of said two pressure transducers is highly identical.
Said diagnostic process unit comprises also and is used for the digital filtering module that acoustic emission signal and hydraulic pressure to input carry out filtering that said data acquisition unit passes through digital filtering module respectively and links to each other with feature extraction unit, lift computing unit.
Said data acquisition unit comprises that being used for input signal is carried out the signal sampling unit of windowing sampling and is used for the analog signal conversion of importing is the AD conversion unit of digital signal; The input end of said signal sampling unit links to each other with acoustic emission signal collecting unit, pressure transducer respectively, and the output terminal of said signal sampling unit links to each other with the diagnostic process unit through AD conversion unit.
Said feature extraction unit comprises the characteristic vector generation module that is used for according to the signal energy construction feature vector of acoustic emission signal; Said diagnostic process unit also is used for providing according to pump operating condition the normal vector storage unit of corresponding normal vector; The output terminal of the output terminal of said characteristic vector generation module, normal vector storage unit links to each other with said diagnosis unit respectively; Said diagnosis unit is inquired about said normal vector storage unit according to the pump head of said lift computing unit output and is obtained the corresponding normal vector of water pump current working, and diagnoses water pump cavitation fault and export diagnostic result according to the characteristic vector and the said normal vector of said characteristic vector generation module output.
Said feature extraction unit also comprises the Event count acquisition module that is used to extract the acoustic emission signal Event count; The output terminal of said Event count acquisition module links to each other with said diagnosis unit, and said diagnosis unit is diagnosed water pump cavitation fault and exported diagnostic result according to the Event count of said Event count acquisition module output.
Said feature extraction unit also comprises the Ring-down count acquisition module that is used to extract the acoustic emission signal Ring-down count; The output terminal of said Ring-down count acquisition module links to each other with said diagnosis unit, and said diagnosis unit is diagnosed water pump cavitation fault and exported diagnostic result according to the Ring-down count of said Ring-down count acquisition module output.
Said feature extraction unit also comprises the CF center frequency acquisition module that is used to extract the acoustic emission signal CF center frequency; The output terminal of said CF center frequency acquisition module links to each other with said diagnosis unit, and said diagnosis unit is diagnosed water pump cavitation fault and exported diagnostic result according to the CF center frequency of said CF center frequency acquisition module output.
The utlity model has following advantage:
1, the diagnostic process unit of the utility model obtains pump head according to the acoustic emission signal extraction characteristics of Acoustic Emission of acoustic emission signal collecting unit input, the two-way hydraulic pressure of importing according to two pressure transducers; And according to characteristics of Acoustic Emission and pump head diagnosis water pump cavitation Fault Diagnosis unit; Can realize the real-time online of cavitation fault under the different operating modes of water pump is detected; Acoustic emission signal and pressure signal to water pump obtains in real time, signal analysis, feature extraction and carry out fault judgement, for trouble-saving generation, ensure that the water pump safety and economic operation has important value; And the utility model is directed against the different characteristic that acoustic emission signal possessed under the different lift work condition states of water pump; Completion is to the automatic judgement of water pump cavitation fault; Can obtain fault diagnosis result in early days; The economic loss that the water pump cavitation is brought is in time handled, reduced to the water pump cavitation, and water pump detects the performance height in real time, have testing result accurately and reliably, detect validity high, detect rapidly and efficiently, the advantage of simple to operation, simple and compact for structure, with low cost, long service life.
2, the acoustic emission signal collecting unit of the utility model further comprises a plurality of calibrate AE sensors, and the acoustic emission signal capturing ability is good; And at least one calibrate AE sensor be adhered fixed on the pump housing of water pump suction side, at least one calibrate AE sensor is adhered fixed on the pump housing of exit of pump side; Emission sensor is easy for installation; Only need simply stick on the object under test and get final product; And the intensity that acoustic emission signal is caught is better, thereby can improve the validity of detection.
3, the acoustic emission signal collecting unit of the utility model comprises that further the acoustic emission signal that is used for calibrate AE sensor output amplifies the preamplifier of filtration; The diagnostic process unit further comprises and is used for the digital filtering module that acoustic emission signal and hydraulic pressure to input carry out filtering; Through the hardware filtering function of preamplifier and the digital filtering double-smoothing of digital filtering module; Can effectively remove noise interference, improve the anti-interference of device.
4, the feature extraction unit of the utility model further comprises the characteristic vector generation module; The diagnostic process unit also is used for providing according to pump operating condition the normal vector storage unit of corresponding normal vector; Diagnosis unit obtains the corresponding normal vector of water pump current working according to the pump head query criteria vector storage unit of lift computing unit output; And diagnose water pump cavitation fault and export diagnostic result with normal vector according to the characteristic vector of characteristic vector generation module output; Diagnosis accuracy is high, and diagnostic mode is simply efficient.
5, the feature extraction unit of the utility model further comprises Event count acquisition module, Ring-down count acquisition module and CF center frequency acquisition module; Diagnosis unit can also be according to Event count, Ring-down count and CF center frequency diagnosis water pump cavitation fault; Diagnostic means is various; Detect more accurately and reliably, and Applicable scope is wider.
Description of drawings
Fig. 1 is the utility model embodiment's a frame structure schematic representation.
Fig. 2 is the frame structure schematic representation of the utility model embodiment's diagnostic process unit.
Fig. 3 is the utility model embodiment's a practical application structural representation.
Fig. 4 is the utility model embodiment signal processing flow schematic representation.
Marginal data: 1, acoustic emission signal collecting unit; 11, preamplifier; 2, pressure transducer; 3, data acquisition unit; 31, signal sampling unit; 32, AD conversion unit; 4, diagnostic process unit; 40, digital filtering module; 41, feature extraction unit; 411, characteristic vector generation module; 412, Event count acquisition module; 413, Ring-down count acquisition module; 414, CF center frequency acquisition module; 42, lift computing unit; 43, diagnosis unit; 44, normal vector storage unit.
Embodiment
As shown in Figure 1; Present embodiment comprises the acoustic emission signal collecting unit 1 that is used to gather the water pump acoustic emission signal, is used to detect two pressure transducers 2, the data acquisition unit 3 of water pump suction side hydraulic pressure and outlet side hydraulic pressure and is used for according to acoustic emission signal and hydraulic pressure diagnosis water pump cavitation fault and exports the diagnostic process unit 4 of diagnostic result based on the water pump cavitation trouble-shooter of acoustic emission testing; Acoustic emission signal collecting unit 1, pressure transducer 2 link to each other with diagnostic process unit 4 through data acquisition unit 3 respectively; Diagnostic process unit 4 comprise be used for according to the acoustic emission signal of input extract characteristics of Acoustic Emission feature extraction unit 41, be used for two-way hydraulic pressure according to input and obtain the lift computing unit 42 of pump head and be used for according to characteristics of Acoustic Emission and pump head diagnosis water pump cavitation Fault Diagnosis unit 43, feature extraction unit 41, lift computing unit 42 link to each other with the input end of diagnosis unit 43 respectively.
Catch because the acoustic emission signal that cavitation effect produces in the water pump is difficult; It is stronger to decay; Therefore the utility model acoustic emission signal collecting unit 1 strengthens the capturing ability of acoustic emission signal through adopting a plurality of calibrate AE sensors; In subsequent processes,, can select as required wherein one tunnel better quality of signal acoustic emission signal is perhaps selected in the stack of multichannel acoustic emission signal for the processing of the multichannel acoustic emission signal of importing.Through the experiment proof; Three positions collections of the pump housing of the pump housing of the pump housing of water pump suction side, exit of pump side and water pump vane outside acoustic emission signal relative intensity is bigger; But the pump housing of water pump vane outside is out-of-shape often; Be difficult to the fixed sound emission sensor; Therefore in the present embodiment in order to simplify processing, acoustic emission signal collecting unit 1 comprises two calibrate AE sensors, calibrate AE sensor through the mode that adheres to be adhered fixed on the pump housing of water pump suction side, another calibrate AE sensor is adhered fixed on the pump housing of exit of pump side through the mode that adheres to.
As shown in Figure 2; Feature extraction unit 41 comprises the characteristic vector generation module 411 that is used for according to the signal energy construction feature vector of acoustic emission signal; Diagnostic process unit 4 also is used for providing according to pump operating condition the normal vector storage unit 44 of corresponding normal vector; The output terminal of the output terminal of characteristic vector generation module 411, normal vector storage unit 44 links to each other with diagnosis unit 43 respectively; Diagnosis unit 43 obtains the corresponding normal vector of water pump current working according to the pump head query criteria vector storage unit 44 of lift computing unit 42 outputs, and diagnoses water pump cavitation fault and export diagnostic result according to the characteristic vector and the normal vector of 411 outputs of characteristic vector generation module.In the present embodiment, diagnostic process unit 4 comprises also and is used for the digital filtering module 40 that acoustic emission signal and hydraulic pressure to input carry out filtering that data acquisition unit 3 passes through digital filtering module 40 respectively and links to each other with feature extraction unit 41, lift computing unit 42.
As shown in Figure 3; A pressure transducer 2 in two pressure transducers 2 is located in the pipeline of water pump suction side; Another pressure transducer 2 is located in the pipeline of exit of pump side, and the layout of two pressure transducers 2 is highly identical, and the highly identical lift that can simplify lift computing unit 42 of the layout of two pressure transducers 2 calculates; Thereby can simplify the calculation process of diagnostic process unit 4, can save the calculation resources of diagnostic process unit 4, the power consumption of reduction diagnostic process unit 4.In the present embodiment, the model of calibrate AE sensor is SR-150M, and its output signal is an analog voltage signal, and its responding range is 50～400kHz, resonant frequency 150kHz, and peak response is 65dB; Acoustic emission signal collecting unit 1 comprises that also the acoustic emission signal that is used for calibrate AE sensor output amplifies the preamplifier 11 of filtration; Calibrate AE sensor links to each other with data acquisition unit 3 through preamplifier 11 respectively; Preamplifier 11 is the amplification filtering circuit; Bandwidth is 10K～2MHz, gains to be 40db; The model of pressure transducer 2 is HP-BPS308, and measuring range is-0.1～0.6MPa, supply voltage 24V, and precision 0.5%F.S, the output signal is 4～20mA analog current signal, one 250 Ω resistance output obtains 1～5V analog voltage signal through connecting; Data acquisition unit 3 is specifically selected Ling Hua science and technology PCI-9846H multifunctional data acquiring case for use; PCI-9846H multifunctional data acquiring case provides 4 sampling channels; The sample frequency of each sampling channel can reach 40M; But also have 16 A/D high-resolution precision, and A/D range ± 5V, thus realize the sampling function of signal sampling unit 31 and the signal analog-digital conversion function of AD conversion unit 32; Diagnostic process unit 4 is based on the computer realization that signal analysis and fault diagnosis system are installed; Signal analysis and fault diagnosis system are developed based on the LABVIEW Software Development Platform; The signal that gathers is carried out Treatment Analysis, extracts characteristic, and the water pump cavitation fault diagnosis result that draws is also exported to operator with forms such as numeral, image, sound.
Pump head is meant the useful power that the unit weight flow of liquid is obtained behind pump, be one of important process performance parameter of water pump, and lift computing unit 42 is behind acquisition water pump inlet and outlet pressure, to calculate.In the present embodiment, lift computing unit 42 is following according to the formula that the two-way hydraulic pressure of importing obtains pump head:
In the formula, P
1Be inlet pressure, P
2Be outlet pressure, Z
1, Z
2Be the perpendicular distance of pressure transducer center to reference level, V
1, V
2For importing and exporting the pipeline water velocity, ρ is a water density, and g is a gravity accleration.Because water pump import and export caliber is identical in the present embodiment, the layout of two pressure transducers 2 is highly identical, so V
1=V
2, Z
1=Z
2Therefore, the formula of pump head can further be reduced to:
H＝(P
2-P
1)/ρg。
For acoustic emission signal, the acoustic emission signal energy in a period of time is:
Wherein E (t) is certain cumlative energy constantly, and x (t) is an acoustic emission signal, t
1, t
2Be respectively Event triggered and concluding time.In the present embodiment; Characteristic vector generation module 411 is following according to the step of the signal energy structure acoustic emission multidimensional vector characteristic of acoustic emission signal: 1) get the reflection of the signal variance of different frequency range as this band energy value; Frequency spectrum characteristic according to the water pump acoustic emission signal; Be divided into 5 frequency range: 0k～50kHz, 50～100kHz, 100～150kHz, 150～200kHz and greater than 200kHz, and form one 5 n dimensional vector n by full frequency band; 2) problem that differs greatly with change of frequency for erasure signal intensity is carried out weighting normalization to the signal of different frequency range and is handled and obtain final acoustic emission multidimensional vector characteristic, exports diagnosis unit 43 to as the characteristic vector of judging the water pump extent of cavitation.In the present embodiment, the Weighting factor k when weighting normalization is handled
nMathematic(al) representation be:
According to the different water pumping head three groups of different standard acoustic emission multidimensional vectors are set respectively in the preset standard vector storage unit 44, respectively normal, initial cavitation of representative operation and the serious three kinds of different working conditions states of cavitation.The standard acoustic emission multidimensional vector is one group of empirical value, and its standard acoustic emission multidimensional vector of dissimilar water pumps is also different, generally can obtain its standard acoustic emission multidimensional vector to dissimilar water pumps through experiment.
Wherein the vector of the i time measurement signal
σ is the variance of acoustic emission signal.
Event count is a canonical parameter in the acoustic emission signal, is meant that specifically the rectangular pulse that when the envelope of pulse decay ripple surpasses threshold voltage, produces is called Event count, and the Event count in the unit time is called Event count rate.It is relevant with the selection of threshold voltage, if the too little meeting of threshold voltage increases event number, then can miss less acoustic emission event again too greatly.In the present embodiment; Feature extraction unit 41 also comprises the Event count acquisition module 412 that is used to extract the acoustic emission signal Event count; The output terminal of Event count acquisition module 412 links to each other with diagnosis unit 43; Diagnosis unit 43 is diagnosed water pump cavitation fault and is exported diagnostic result according to the Event count of Event count acquisition module 412 outputs, if the Event count of Event count acquisition module 412 outputs surpasses the Event count predefined value, then diagnosis unit 43 judges that water pump takes place, and cavitation effect has taken place.
Ring-down count is a canonical parameter in the acoustic emission signal, is meant that specifically acoustic emission signal surpasses threshold voltage and produces the number of oscillating impulse, and an incident can comprise several Ring-down counts.Generally speaking, threshold value is identical, and the incident energy is big more, and it is just long more that signal amplitude decays to the time that is consumed below the threshold value, and the ring number that individual event comprised is just many more.In the present embodiment; Feature extraction unit 41 also comprises the Ring-down count acquisition module 413 that is used to extract the acoustic emission signal Ring-down count; The output terminal of Ring-down count acquisition module 413 links to each other with diagnosis unit 43; Diagnosis unit 43 is diagnosed water pump cavitation fault and is exported diagnostic result according to the Ring-down count of Ring-down count acquisition module 413 outputs, if the Ring-down count of Ring-down count acquisition module 413 outputs surpasses the Ring-down count predefined value, then diagnosis unit 43 judges that water pump takes place, and cavitation effect has taken place.
CF center frequency is a canonical parameter in the acoustic emission signal, specifically is meant the mean value of signal amplitude-versus-frequency curve, i.e. the geometrical mean of its upper limiting frequency and lower frequency limit on amplitude-versus-frequency curve.It can reflect the dominant frequency scope of acoustic emission signal.Except acoustic emission multidimensional vector characteristic; Also be used as diagnosing water pump whether the foundation of cavitation effect takes place through the Event count in the acoustic emission signal, Ring-down count and three kinds of characteristics of Acoustic Emission of CF center frequency respectively in the present embodiment: in the present embodiment; Feature extraction unit 41 also comprises the CF center frequency acquisition module 414 that is used to extract the acoustic emission signal CF center frequency; The output terminal of CF center frequency acquisition module 414 links to each other with diagnosis unit 43; Diagnosis unit 43 is diagnosed water pump cavitation fault and is exported diagnostic result according to the CF center frequency of CF center frequency acquisition module 414 outputs; If the CF center frequency of CF center frequency acquisition module 414 outputs surpasses the CF center frequency predefined value, then diagnosis unit 43 judges that water pump takes place, and cavitation effect has taken place.
In the present embodiment; Event count, Ring-down count and three kinds of characteristics of Acoustic Emission of CF center frequency all can be through convenient acquisitions of the built-in function module of LABVIEW platform; For example after obtaining the amplitude spectrum of acoustic emission signal; Call " asking the array maximum value " module in the LABVIEW platform, obtain the maximum value index of amplitude spectrum sequence, what the maximum value index referred to is exactly the CF center frequency of acoustic emission signal.Diagnosis unit 43 if the quantity of Event count, Ring-down count and CF center frequency surpasses predefined value, is then judged the current cavitation fault that taken place of water pump according to Event count, Ring-down count and CF center frequency diagnosis cavitation effect fault the time.The predefined value of Event count, Ring-down count and CF center frequency generally can value be 2～3 times of normal quantity.
As shown in Figure 4; The job step of present embodiment is following: 1) acoustic emission signal collecting unit 1 is gathered the acoustic emission signal of water pump in real time; Two pressure transducers 2 are gathered water pump suction side hydraulic pressure and outlet side hydraulic pressure respectively in real time; The two-way acoustic emission signal of two calibrate AE sensors output is imported preamplifier 11 respectively, and preamplifier 11 amplifies the acoustic emission signal of input, import data acquisition unit 3 respectively after the filtering; Simultaneously, the hydraulic pressure of two pressure transducer 2 outputs is imported data acquisition unit 3 respectively.2) the two-way acoustic emission signal of 3 pairs of inputs of data acquisition unit is carried out the sampling fragment that windowing process obtains acoustic emission signal respectively, and the acoustic emission signal sampling fragment that obtains is carried out exporting diagnostic process unit 4 to after the analog-to-digital conversion; The two-way hydraulic signal of 3 pairs of inputs of data acquisition unit carries out the sampling fragment that windowing process obtains hydraulic signal respectively, and the hydraulic signal sampling fragment that obtains is carried out exporting diagnostic process unit 4 to after the analog-to-digital conversion.3) the two-way hydraulic signal of 40 pairs of inputs of digital filtering module and two-way acoustic emission signal are carried out digital filtering respectively.The characteristic vector generation module 411 of feature extraction unit 41 makes up the characteristic vector of 5 dimensions according to the signal energy of acoustic emission signal; Lift computing unit 42 calculates the current lift of water pump according to two-way hydraulic pressure; Diagnosis unit 43 obtains the corresponding normal vector of water pump current working according to the pump head query criteria vector storage unit 44 of lift computing unit 42 outputs; Diagnosis unit 43 compares the characteristic vector and the normal vector of 411 outputs of characteristic vector generation module; Find out a nearest normal vector of vector distance, export to operator with the corresponding cavitation fault diagnosis result of this normal vector of forms such as numeral, image, sound output (normal, perhaps initial cavitation of operation or cavitation are serious) then.Simultaneously; Event count acquisition module 412, Ring-down count acquisition module 413, CF center frequency acquisition module 414 extract three kinds of characteristics of Acoustic Emission of Event count, Ring-down count, CF center frequency of acoustic emission signal respectively; Any one exceeds predefined value in Event count, Ring-down count, three kinds of characteristics of Acoustic Emission of CF center frequency if diagnosis unit 43 detects, and then exports to operator with the corresponding cavitation fault diagnosis result of forms such as numeral, image, sound output predefined value (normal, perhaps initial cavitation of operation or cavitation are serious).
The above only is the preferred implementation of the utility model, and the protection domain of the utility model also not only is confined to the foregoing description, and all technological schemes that belongs under the utility model thinking all belong to the protection domain of the utility model.Should be pointed out that for those skilled in the art in the some improvement and the retouching that do not break away under the utility model principle prerequisite, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (10)
1. water pump cavitation trouble-shooter based on acoustic emission testing; It is characterized in that: comprise the acoustic emission signal collecting unit (1) that is used to gather the water pump acoustic emission signal, two pressure transducers (2) that are used to detect water pump suction side hydraulic pressure and outlet side hydraulic pressure, data acquisition unit (3) and be used for according to said acoustic emission signal and hydraulic pressure diagnosis water pump cavitation fault and export the diagnostic process unit (4) of diagnostic result; Said acoustic emission signal collecting unit (1), pressure transducer (2) link to each other with diagnostic process unit (4) through data acquisition unit (3) respectively; Said diagnostic process unit (4) comprise be used for according to the acoustic emission signal of input extract characteristics of Acoustic Emission feature extraction unit (41), be used for two-way hydraulic pressure according to input and obtain the lift computing unit (42) of pump head and diagnose water pump cavitation Fault Diagnosis unit (43) according to characteristics of Acoustic Emission and pump head with being used for, said feature extraction unit (41), lift computing unit (42) link to each other with the input end of diagnosis unit (43) respectively.
2. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 1; It is characterized in that: said acoustic emission signal collecting unit (1) comprises a plurality of calibrate AE sensors, and at least one calibrate AE sensor be adhered fixed on the pump housing of water pump suction side, at least one calibrate AE sensor is adhered fixed on the pump housing of exit of pump side.
3. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 2; It is characterized in that: said acoustic emission signal collecting unit (1) comprises that also the acoustic emission signal that is used for calibrate AE sensor output amplifies the preamplifier (11) of filtration, and said calibrate AE sensor links to each other with data acquisition unit (3) through preamplifier (11) respectively.
4. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 1; It is characterized in that: the pressure transducer (2) in said two pressure transducers (2) is located in the pipeline of water pump suction side; Another pressure transducer (2) is located in the pipeline of exit of pump side, and the layout of said two pressure transducers (2) is highly identical.
5. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 1; It is characterized in that: said diagnostic process unit (4) comprises also and is used for the digital filtering module (40) that acoustic emission signal and hydraulic pressure to input carry out filtering that said data acquisition unit (3) passes through digital filtering module (40) respectively and links to each other with feature extraction unit (41), lift computing unit (42).
6. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 1; It is characterized in that: said data acquisition unit (3) comprises that being used for input signal is carried out the signal sampling unit (31) of windowing sampling and is used for the analog signal conversion of importing is the AD conversion unit (32) of digital signal; The input end of said signal sampling unit (31) links to each other with acoustic emission signal collecting unit (1), pressure transducer (2) respectively, and the output terminal of said signal sampling unit (31) links to each other with diagnostic process unit (4) through AD conversion unit (32).
7. according to any described water pump cavitation trouble-shooter in the claim 1～6 based on acoustic emission testing; It is characterized in that: said feature extraction unit (41) comprises the characteristic vector generation module (411) that is used for according to the signal energy construction feature vector of acoustic emission signal; Said diagnostic process unit (4) also is used for providing according to pump operating condition the normal vector storage unit (44) of corresponding normal vector; The output terminal of the output terminal of said characteristic vector generation module (411), normal vector storage unit (44) links to each other with said diagnosis unit (43) respectively; Said diagnosis unit (43) is inquired about said normal vector storage unit (44) according to the pump head of said lift computing unit (42) output and is obtained the corresponding normal vector of water pump current working, and diagnoses water pump cavitation fault and export diagnostic result according to the characteristic vector and the said normal vector of said characteristic vector generation module (411) output.
8. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 7; It is characterized in that: said feature extraction unit (41) also comprises the Event count acquisition module (412) that is used to extract the acoustic emission signal Event count; The output terminal of said Event count acquisition module (412) links to each other with said diagnosis unit (43), and said diagnosis unit (43) is diagnosed water pump cavitation fault and exported diagnostic result according to the Event count of said Event count acquisition module (412) output.
9. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 8; It is characterized in that: said feature extraction unit (41) also comprises the Ring-down count acquisition module (413) that is used to extract the acoustic emission signal Ring-down count; The output terminal of said Ring-down count acquisition module (413) links to each other with said diagnosis unit (43), and said diagnosis unit (43) is diagnosed water pump cavitation fault and exported diagnostic result according to the Ring-down count of said Ring-down count acquisition module (413) output.
10. the water pump cavitation trouble-shooter based on acoustic emission testing according to claim 9; It is characterized in that: said feature extraction unit (41) also comprises the CF center frequency acquisition module (414) that is used to extract the acoustic emission signal CF center frequency; The output terminal of said CF center frequency acquisition module (414) links to each other with said diagnosis unit (43), and said diagnosis unit (43) is diagnosed water pump cavitation fault and exported diagnostic result according to the CF center frequency of said CF center frequency acquisition module (414) output.
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2011
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103629122A (en) * | 2013-12-18 | 2014-03-12 | 江苏大学 | Detection platform realizing active control on vibration frequency of internal cavitation of centrifugal pump |
| CN103629122B (en) * | 2013-12-18 | 2016-05-18 | 江苏大学 | A kind of monitor station of realizing the inner cavitation vibration frequency of centrifugal pump ACTIVE CONTROL |
| CN103671066A (en) * | 2013-12-26 | 2014-03-26 | 江苏大学 | Acoustic-emission-technology-based device for detecting small-flow working condition unstable flow of centrifugal pump |
| CN103821709A (en) * | 2014-02-27 | 2014-05-28 | 江苏大学 | Self-checking device of water pump performance test system |
| CN104819145A (en) * | 2015-05-20 | 2015-08-05 | 重庆大学 | Method for diagnosing fault of fire pump based on acoustic emission signals |
| CN109058089A (en) * | 2018-06-13 | 2018-12-21 | 天津大学 | A method of the vacuum pump overload fault detection based on acoustic emission signal |
| WO2020024325A1 (en) * | 2018-07-31 | 2020-02-06 | 江苏大学 | Vane pump cavitation determination and state evaluation method and system |
| GB2590289A (en) * | 2018-07-31 | 2021-06-23 | Univ Jiangsu | Vane pump cavitation determination and state evaluation methos and system |
| GB2590289B (en) * | 2018-07-31 | 2021-11-17 | Univ Jiangsu | Method for determination of cavitation and evaluation of cavitation status in vane pump and system therefor |
| CN111353120A (en) * | 2020-02-20 | 2020-06-30 | 内蒙古自治区水利水电勘测设计院 | Design method and design device of long-distance high-altitude water transmission line |
| CN111353120B (en) * | 2020-02-20 | 2023-05-16 | 内蒙古自治区水利水电勘测设计院 | Design method and design device for long-distance high-altitude water delivery line |
| CN111929489A (en) * | 2020-08-18 | 2020-11-13 | 电子科技大学 | Fault arc current detection method and system |
| CN111929489B (en) * | 2020-08-18 | 2021-12-28 | 电子科技大学 | Fault arc current detection method and system |
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