CN210128829U - Abnormal vibration diagnostic equipment for automobile - Google Patents
Abnormal vibration diagnostic equipment for automobile Download PDFInfo
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- CN210128829U CN210128829U CN201920807199.7U CN201920807199U CN210128829U CN 210128829 U CN210128829 U CN 210128829U CN 201920807199 U CN201920807199 U CN 201920807199U CN 210128829 U CN210128829 U CN 210128829U
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Abstract
The utility model provides an automobile abnormal vibration diagnosis device, which comprises a plurality of acceleration sensors, a signal conditioning unit, a signal acquisition unit, a microprocessor and a display; acceleration sensor is used for gathering unusual vibration position and probably arouses the vibration signal at unusual vibration position, then carries out relevance analysis processes to the vibration signal who gathers and obtains the reason that arouses unusual vibration, preferably, adopts three-dimensional acceleration sensor can carry out independent analysis to vibration signal's three direction, and the accurate reason that arouses the vibration that obtains, the utility model discloses simple structure, with low costs, simple to operate have saved the trouble that exchanges, try to fit on and bring, have improved work efficiency, judge faster accurate moreover as a result, have very big using value.
Description
Technical Field
The utility model relates to an automobile inspection technical field especially relates to an automobile abnormal vibration diagnostic equipment.
Background
In the current vehicles, mainly bicycles, electric vehicles, motorcycles, automobiles and the like, in the era of paying money for efficiency and time, the benefits brought to human beings by convenience of traffic are huge, and the bicycles, the electric vehicles and the motorcycles are not very useful in the environment with severe weather, so that the automobiles become main transportation and transport tools for people to go out, and the use of the automobiles not only is fast, but more importantly brings people comfortable experience. However, in the whole vehicle development and use process of the vehicle, abnormal vibration is often encountered, and motor faults, uneven road surfaces, transmission shaft faults and the like can be used as vibration excitation sources to cause abnormal vibration of the whole vehicle, so that the comfort of the whole vehicle is influenced, and even the normal use of the vehicle is influenced. In the process of inspection or maintenance, due to the fact that various reasons are caused by abnormal vibration, the abnormal vibration caused by uneven road surface can be directly judged, but if the abnormal vibration caused by the parts of the automobile is often difficult to judge, the vibration excitation source parts which possibly cause the abnormal vibration comprise a motor, a transmission shaft, wheels, an axle, a frame and the like.
In the prior art, there is also a relevant discussion about the research on abnormal mechanical vibration, for example, a correlation analysis is applied to the vibration source identification, levo-zernike specifically mentions in "machine manufacturing and research" this document that the correlation analysis is applied to the mechanical vibration signal processing, a spectrogram of each signal is obtained through fourier transform, then the vibration signal is subjected to data conversion of time domain and frequency domain, the correlation analysis is performed on the vibration signal in the time domain, that is, a correlation coefficient between the vibration signals is calculated through a correlation function, and then the vibration source generating the abnormal vibration is found according to the correlation coefficient.
Disclosure of Invention
The utility model provides an automobile abnormal vibration diagnostic equipment, the part position that causes abnormal vibration that can be quick accurate improves the work efficiency of vehicle development or maintenance.
The utility model discloses a concrete scheme be:
an abnormal vibration diagnosis device for an automobile comprises a plurality of acceleration sensors for collecting vibration signals of the automobile;
the signal conditioning unit is used for conditioning the collected vibration signals and comprises a filtering module and an amplifying module, wherein the filtering module is a low-pass filter, and the passband of the low-pass filter is 1-1 KHz; the amplifying module adopts an amplifier, the amplification factor of the amplifier is 20 times, and the filtering module is electrically connected with the amplifying module;
the signal acquisition unit is used for acquiring data of the conditioned signals and converting the conditioned signals into discrete signals, and the sampling frequency of the signal acquisition unit is not less than 500 HZ;
the microprocessor is used for analyzing and processing the converted discrete signals;
and a display;
one of the acceleration sensors is fixed at an abnormal vibration part of the automobile, the residual acceleration sensor is fixed at a vibration excitation source part to be detected, the output end of the acceleration sensor is connected with the input end of the signal conditioning unit, the output end of the signal conditioning unit is connected with the input end of the signal acquisition unit, the output end of the signal acquisition unit is connected with the input end of the microprocessor, and the output end of the microprocessor is connected with the display.
Preferably, in order to detect the abnormal vibration signal more accurately, the acceleration sensor is a three-way piezoelectric sensor;
furthermore, in order to fix the acceleration sensor conveniently, the acceleration sensor also comprises an acceleration sensor magnetic seat, and the three-way piezoelectric sensor is fixed on the acceleration sensor special magnetic seat;
preferably, the model of the special magnetic seat for the acceleration sensor is XK 602H;
further, the number of the acceleration sensors is 7.
The utility model has the advantages that:
the utility model discloses a set up an acceleration sensor at unusual vibration position, treat respectively that the position also sets up acceleration sensor and gather vibration signal respectively, then take care of the collection to vibration signal to spread into microprocessor and carry out correlation analysis into, and demonstrate the analysis result in the display, when the car produces unusual vibration, under the condition that does not need dismouting part and retest repeatedly, utilize car unusual vibration diagnostic equipment just can accurately find out the vibration excitation source position that arouses car unusual vibration, moreover the utility model has the advantages of being simple in structure and low in cost, simple to operate, more convenient to popularize and apply.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic view of an installation position of the acceleration sensor according to the present embodiment;
FIG. 3 is a frequency spectrum diagram of a vibration signal in the X direction of the motor;
FIG. 4 is a frequency spectrum diagram of a vibration signal in the Y direction of the motor;
FIG. 5 is a frequency spectrum diagram of a Z-direction vibration signal of the motor;
FIG. 6 is a frequency spectrum graph of a vibration signal in the X direction of a seat in a cab;
FIG. 7 is a frequency spectrum graph of a vibration signal in the Y direction of a seat in a cab;
fig. 8 is a frequency spectrum diagram of a Z-direction vibration signal of the cab seat.
Detailed Description
The present invention will be described in detail with reference to the following drawings and specific embodiments:
an abnormal vibration diagnosis apparatus for a vehicle, as shown in fig. 1, includes a plurality of acceleration sensors for collecting vibration signals of the vehicle;
the signal conditioning unit is used for conditioning the collected vibration signals and comprises a filtering module and an amplifying module, wherein the filtering module is a low-pass filter, and the passband of the low-pass filter is 1-1 KHz; the amplifying module adopts an amplifier, the amplification factor of the amplifier is 20 times, and the filtering module is electrically connected with the amplifying module;
the signal acquisition unit is used for acquiring data of the conditioned signals and converting the conditioned signals into discrete signals, and the sampling frequency of the signal acquisition unit is not less than 500 HZ;
the microprocessor is used for analyzing and processing the converted discrete signals;
and a display;
the output end of the acceleration sensor is connected with the input end of the signal conditioning unit, the output end of the signal conditioning unit is connected with the input end of the signal acquisition unit, the output end of the signal acquisition unit is connected with the input end of the microprocessor, and the output end of the microprocessor is connected with the display.
When abnormal vibration is detected, one of the acceleration sensors is fixed at the abnormal vibration part of the automobile, the rest acceleration sensors are fixed at the vibration excitation source part to be detected, the acceleration sensors are used for collecting vibration signals of the automobile, then the vibration signals are filtered and denoised by the signal conditioning unit, then the vibration signals are subjected to analog-to-digital conversion and collection by the signal collecting unit, finally the vibration signals are transmitted to the microprocessor for analysis and processing, and the processing result is displayed in the display. .
Example (b):
the acceleration sensor is a three-way piezoelectric acceleration sensor, and specific parameters of the three-way piezoelectric acceleration sensor are shown in table 1
Table 1: three-way piezoelectric type acceleration sensor parameter table
The three-way piezoelectric acceleration sensor is used for collecting vibration signals of each part of an automobile in the front-back direction (X direction), the up-down direction (Y direction) and the left-right direction (Z direction), the acceleration sensor is adsorbed on the part to be detected of the automobile through a special magnetic seat for the acceleration sensor, the specific model of the special magnetic seat for the acceleration sensor is XK602H, the parameters are shown in Table 2,
table 2: acceleration sensor is furnished with special magnetic support parameter table
| Model number | Frequency response | Magnetic force kg | Temperature of use | Connection form | |
| XK602H | 0-7000 | 12 | -40~120 | M5 |
The magnetic seat special for the acceleration sensor can conveniently and quickly adsorb the acceleration sensor on the part to be detected of the automobile, and the installation time is saved.
The signal conditioning unit comprises a filtering module and an amplifying module, wherein the filtering module is a low-pass filter, and the frequency band of a general vibration signal is 0-600HZ, so that the low-pass filter adopts a low-pass filter with a pass band of 1-1 KHz; the amplifying module adopts an amplifier, the amplification factor of the amplifier is 20 times, the filtering module is electrically connected with the amplifying module, and in order to avoid signal distortion, the sampling frequency of the signal acquisition unit is not less than 500 HZ.
For further explanation and explanation of the present invention, the abnormal vibration of the driver's seat is taken as an example for explanation, as shown in fig. 2, the acceleration sensor adopted in the present invention is seven, and can be adjusted adaptively according to actual requirements, wherein one of the acceleration sensors is fixed under the driver's seat of the automobile (position thereof)
) The rest six acceleration sensors are respectively fixed on the motor (position) of the automobile
) Rear floor of driver's cab
) Front floor of driver's cab (position)
) Rear axle (position)
) Rear frame (position)
) Front frame (position)
) And then acquiring the analog vibration signals of the parts of the automobile, wherein the analog vibration signals are transmitted to the signal conditioning unit for interference elimination and denoising, the conditioned analog vibration signals are input to the signal acquisition unit for analog-to-digital conversion and acquisition, and the vibration signals processed by the signal acquisition unit are converted into discrete vibration signalsAnd the processing of the microprocessor is more convenient.
Then, the obtained discrete vibration signals at each position are transmitted into a microprocessor to be analyzed and processed to obtain a spectrogram of each vibration signal, then, data conversion of a time domain and a frequency domain is performed on the vibration signals, correlation analysis is performed on the vibration signals in the time domain to obtain correlation coefficients, and here, the vibration signals are analyzed and processed to obtain the spectrogram, the time domain and the frequency domain are further converted, and the method for performing correlation analysis in the time domain is the prior art and does not belong to the innovation point of the application. Due to the adoption of the three-way piezoelectric acceleration sensor, a frequency spectrum diagram of vibration signals in three directions can be obtained at each position, fig. 3, 4, 5 are respectively frequency spectrum diagrams of vibration signals in the direction of X, Y, Z of the motor, and fig. 6, 7 and 8 are respectively frequency spectrum diagrams of vibration signals in the direction of X, Y, Z under a cab seat. When the correlation coefficient is 1, the vibration signals subjected to the correlation analysis are completely correlated, when the correlation coefficient is 0, the vibration signals subjected to the correlation analysis are completely independent, and when the correlation coefficient is-1, the vibration signals subjected to the correlation analysis are inversely correlated. In this embodiment, the correlation coefficient obtained by performing cross-correlation analysis on the vibration signal in the Y direction at the motor position and the vibration signal in the Y direction under the cab seat is 0.89, and as a result, it can be seen that there is a correlation between the vibration signal in the Y direction at the motor position and the vibration signal in the Y direction at the cab seat, that is, the motor position is a position where resonance occurs with the cab seat, and it can be diagnosed that abnormal vibration at the cab seat is caused by vibration of the motor.
The utility model discloses a set up an acceleration sensor at unusual vibration position, treat respectively that the position also sets up acceleration sensor and gather vibration signal respectively, then take care of the collection to vibration signal to spread into microprocessor and carry out correlation analysis into, and demonstrate the analysis result in the display, when the car produces unusual vibration, under the condition that does not need dismouting part and retest repeatedly, utilize car unusual vibration diagnostic equipment just can accurately find out the vibration excitation source position that arouses car unusual vibration, moreover the utility model has the advantages of being simple in structure and low in cost, simple to operate, more convenient to popularize and apply.
Claims (5)
1. An abnormal vibration diagnosis apparatus for an automobile, characterized in that: the system comprises a plurality of acceleration sensors for collecting vibration signals of the automobile;
the signal conditioning unit is used for conditioning the collected vibration signals and comprises a filtering module and an amplifying module, wherein the filtering module is a low-pass filter, and the passband of the low-pass filter is 1-1 KHz; the amplifying module adopts an amplifier, the amplification factor of the amplifier is 20 times, and the filtering module is electrically connected with the amplifying module;
the signal acquisition unit is used for acquiring data of the conditioned signals and converting the conditioned signals into discrete signals, and the sampling frequency of the signal acquisition unit is not less than 500 HZ;
the microprocessor is used for analyzing and processing the converted discrete signals;
and a display;
one of the acceleration sensors is fixed at an abnormal vibration part of the automobile, the residual acceleration sensor is fixed at a vibration excitation source part to be detected, the output end of the acceleration sensor is connected with the input end of the signal conditioning unit, the output end of the signal conditioning unit is connected with the input end of the signal acquisition unit, the output end of the signal acquisition unit is connected with the input end of the microprocessor, and the output end of the microprocessor is connected with the display.
2. The abnormal vibration diagnosis apparatus for an automobile according to claim 1, wherein: the acceleration sensor is a three-way piezoelectric sensor.
3. The abnormal vibration diagnosis apparatus for an automobile according to claim 2, wherein: the three-way piezoelectric type sensor is fixed on the magnetic seat special for the acceleration sensor.
4. The abnormal vibration diagnosis apparatus for vehicle as claimed in claim 3, wherein: the model of the special magnetic seat for the acceleration sensor is XK 602H.
5. The abnormal vibration diagnosis apparatus for an automobile according to claim 1, wherein: the number of the acceleration sensors is 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920807199.7U CN210128829U (en) | 2019-05-31 | 2019-05-31 | Abnormal vibration diagnostic equipment for automobile |
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| CN201920807199.7U CN210128829U (en) | 2019-05-31 | 2019-05-31 | Abnormal vibration diagnostic equipment for automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161699A (en) * | 2020-08-24 | 2021-01-01 | 河南科技大学 | Resonance monitoring system and method for unmanned automobile |
| CN113959553A (en) * | 2021-10-29 | 2022-01-21 | 中大检测(湖南)股份有限公司 | Intelligent low-frequency vibration sensor based on CPLD |
-
2019
- 2019-05-31 CN CN201920807199.7U patent/CN210128829U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161699A (en) * | 2020-08-24 | 2021-01-01 | 河南科技大学 | Resonance monitoring system and method for unmanned automobile |
| CN113959553A (en) * | 2021-10-29 | 2022-01-21 | 中大检测(湖南)股份有限公司 | Intelligent low-frequency vibration sensor based on CPLD |
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