CN201392240Y - Bearing noise level measuring instrument - Google Patents
Bearing noise level measuring instrument Download PDFInfo
- Publication number
- CN201392240Y CN201392240Y CN200920011832U CN200920011832U CN201392240Y CN 201392240 Y CN201392240 Y CN 201392240Y CN 200920011832 U CN200920011832 U CN 200920011832U CN 200920011832 U CN200920011832 U CN 200920011832U CN 201392240 Y CN201392240 Y CN 201392240Y
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- signal
- bearing
- voltage
- measuring instrument
- bearing noise
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Abstract
The utility model discloses a bearing noise level measuring instrument, which is characterized in that a signal acquisition unit contacts with a field measured bearing and sends an acquired acceleration signal to a voltage preamplifier for preamplification, then the acceleration signal is filtered through a filter of 20Hz-20KHz and converted and amplified into a speed signal through a voltage speed amplifier, the improved filter processing of the speed signal is carried out through an A-weighted filter, a voltage signal is converted into a frequency signal through a precision voltage-frequency converter, the frequency signal is then sent to a track-hold circuit for processing, and finally the frequency signal is processed into a standard sound level signal through the computation of a high-speed logarithmic amplifier and sent to a display unit for displaying. The measurement of the measuring instrument is not influenced by ambient background noise, and the measuring instrument is suitable for the on-line measurement of the bearing noise, so that the bearing noise is possible to be used for measuring the bearing quality; due to simple and reasonable structure and accurate measured values, the bearing noise level measuring instrument is convenient to produce and suitable for broad popularization in a bearing measuring trade.
Description
Technical field
The utility model relates to a kind of bearing noise measurement mechanism, relates in particular to a kind of contact bearing noise sound level measurement instrument.
Background technology
Bearing noise belongs to mechanical noise, and its effect that operates at friction, alternating force produces vibration down, is produced noise by vibration.Bearing industry is all wished the leading indicator of bearing noise as the measurement bearing quality both at home and abroad, but for many years, because can't resolve the in-site measurement problem of bearing noise, and can not realize it as the index of measuring.At present, the instrument of measuring noise all adopts sound meter usually, and is often relatively more abominable because of the environment or the Production of bearing scene of bearing working, so be subject to the influence of ground unrest measuring the bearing noise sound level, cause the variation of sound meter, and can not be distinguished restriction.Generally want to use sound meter and measure the bearing noise and just can only carry out in the anechoic chamber, so not only cost is high but also can not advance in-site measurement again, so the measurement of bearing noise implements very inconvenience.
Summary of the invention
The utility model is at the proposition of above problem, and develops a kind of influence of ground unrest on every side that is not subjected to, and is suitable for the bearing noise sound level measurement instrument of bearing noise on-line measurement.The technological means that the utility model adopted is as follows:
A kind of bearing noise sound level measurement instrument, it is characterized in that signal gathering unit contacts with the in-site measurement bearing, the acceleration signal that collects is met at the voltage prime amplifier carry out preposition amplification, by the 20Hz-20KHz wave filter this acceleration signal is carried out Filtering Processing again, after the voltage velocity-variation amplifier becomes rate signal after transforming amplification, by A weighted wave filter this rate signal is revised Filtering Processing, after by accurate voltage-frequency converter voltage signal being changed into frequency signal again, meet at track and hold circuit and handle, become the standard sound level signal and give display unit to show by the computing of high speed logarithmic amplifier at last.
Described signal gathering unit adopts piezoelectric accelerometer.
Owing to adopted technique scheme, the bearing noise sound level measurement instrument that the utility model provides, have measurement and be not subjected to the influence of ground unrest on every side, be suitable for the bearing noise on-line measurement, make bearing noise become possibility as weighing bearing quality, and because it is simple and reasonable for structure, measured value accurately, be convenient to produce, and with low cost being very suitable for extensively promoted in the bearing measuring industry.
Description of drawings
The utility model has four width of cloth accompanying drawings:
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is the circuit diagram of accurate voltage-frequency converter of the utility model embodiment;
Fig. 3 is the circuit diagram of the track and hold circuit of the utility model embodiment;
Fig. 4 is the circuit diagram of the high speed logarithmic amplifier of the utility model embodiment.
Among the figure: 101, voltage prime amplifier,
102,20Hz-20KHz wave filter,
103, voltage velocity-variation amplifier,
104, A weighted wave filter,
105, accurate voltage-frequency converter,
106, track and hold circuit,
107, high speed logarithmic amplifier,
108, display unit,
109, signal gathering unit.
Embodiment
In conjunction with Fig. 1 bearing noise sound level measurement instrument described in the utility model is described in detail, measure the principle basis of bearing noise sound level with " vibration velocity method " and carry out the bearing noise sound level measurement, utilize sensor that bear vibration is gathered, when the crystal pressurized of piezoelectric properties, the electromotive force that produces carries out the acoustic-electric conversion, and this vibration signal, its output is directly proportional with vibration velocity, and speed and sound level are equally all relevant with amplitude, frequency; And instrument adopted A frequency weighting network in the sound meter, this is provided with reference to contour of equal loudness, be for the reading that makes instrument near people's ear corresponding to different frequency, the aural signature of anthropomorphic dummy's ear, measured noise is carried out the filter network of sense of hearing correction, by circuit signal voltage is converted automatically by the frequency weighted, draw the sound level information that meets the GB/T3785 standard code at last.
The signal gathering unit 109 that the utility model is mentioned, the concrete piezoelectric accelerometer YD81D type accelerometer that adopts in the present embodiment.The concrete course of work is: accelerometer contacts with the on-the-spot bearing that needs to measure, the acceleration signal that collects is met at voltage prime amplifier 101 carry out preposition amplification, carry out Filtering Processing by 102 pairs of these acceleration signals of 20Hz-20KHz wave filter again, after voltage velocity-variation amplifier 103 becomes rate signal after transforming amplification, revise Filtering Processing by 104 pairs of these rate signals of A weighted wave filter, after by accurate voltage-frequency converter 105 (particular circuit configurations as shown in Figure 2) voltage signal being changed into frequency signal again, meet at track and hold circuit 106 (particular circuit configurations as shown in Figure 3) and handle, become the standard sound level signal and give display unit 108 to show by high speed logarithmic amplifier 107 (particular circuit configurations as shown in Figure 4) computing at last.Wherein the sound level of Xian Shiing (sound level) meaning is: the common logarithm of the acoustic pressure Pa that measures with certain meter performance and A weighted and the ratio of reference acoustic pressure (reference acoustic pressure is 20 μ Pa) multiply by 20 (for the transfer principle of high speed logarithmic amplifier 107), represents with dB.Precision meets the requirement of GB/T3785 standard code, and the noise level of demonstration is 20～100dB.
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and inventive concept thereof, all should be encompassed within the protection domain of the present utility model.
Claims (2)
1, a kind of bearing noise sound level measurement instrument, it is characterized in that signal gathering unit (109) contacts with the in-site measurement bearing, the acceleration signal that collects is met at voltage prime amplifier (101) carry out preposition amplification, by 20Hz-20KHz wave filter (102) this acceleration signal is carried out Filtering Processing again, after voltage velocity-variation amplifier (103) becomes rate signal after transforming amplification, by A weighted wave filter (104) this rate signal is revised Filtering Processing, after by accurate voltage-frequency converter (105) voltage signal being changed into frequency signal again, meet at track and hold circuit (106) and handle, become the standard sound level signal and give display unit (108) to show by high speed logarithmic amplifier (107) computing at last.
2,, it is characterized in that described signal gathering unit (109) adopts piezoelectric accelerometer according to the described bearing noise sound level measurement of claim 1 instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920011832U CN201392240Y (en) | 2009-03-10 | 2009-03-10 | Bearing noise level measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920011832U CN201392240Y (en) | 2009-03-10 | 2009-03-10 | Bearing noise level measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201392240Y true CN201392240Y (en) | 2010-01-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920011832U Expired - Fee Related CN201392240Y (en) | 2009-03-10 | 2009-03-10 | Bearing noise level measuring instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN201392240Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507118A (en) * | 2011-10-29 | 2012-06-20 | 洛阳Lyc轴承有限公司 | Medium and small-sized bearing noise vibration test system |
| CN103075333A (en) * | 2012-12-29 | 2013-05-01 | 中国科学院沈阳科学仪器股份有限公司 | Noise monitoring and protection device and method for bearing of oilless vacuum pump |
| CN112379261A (en) * | 2019-12-31 | 2021-02-19 | 上汽通用五菱汽车股份有限公司 | Motor rotating speed and structural parameter calculation method based on vibration noise analysis |
| CN116046147A (en) * | 2023-02-22 | 2023-05-02 | 浙江省计量科学研究院 | Intelligent noise sensor |
-
2009
- 2009-03-10 CN CN200920011832U patent/CN201392240Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507118A (en) * | 2011-10-29 | 2012-06-20 | 洛阳Lyc轴承有限公司 | Medium and small-sized bearing noise vibration test system |
| CN102507118B (en) * | 2011-10-29 | 2014-05-14 | 洛阳Lyc轴承有限公司 | Medium and small-sized bearing noise vibration test system |
| CN103075333A (en) * | 2012-12-29 | 2013-05-01 | 中国科学院沈阳科学仪器股份有限公司 | Noise monitoring and protection device and method for bearing of oilless vacuum pump |
| CN112379261A (en) * | 2019-12-31 | 2021-02-19 | 上汽通用五菱汽车股份有限公司 | Motor rotating speed and structural parameter calculation method based on vibration noise analysis |
| CN112379261B (en) * | 2019-12-31 | 2024-05-28 | 上汽通用五菱汽车股份有限公司 | Motor rotating speed and structural parameter calculation method based on vibration noise analysis |
| CN116046147A (en) * | 2023-02-22 | 2023-05-02 | 浙江省计量科学研究院 | Intelligent noise sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100127 Termination date: 20130310 |