CN212693239U - Dynamic suction noise test system for automobile air conditioner compressor clutch - Google Patents
Dynamic suction noise test system for automobile air conditioner compressor clutch Download PDFInfo
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- CN212693239U CN212693239U CN202021736404.4U CN202021736404U CN212693239U CN 212693239 U CN212693239 U CN 212693239U CN 202021736404 U CN202021736404 U CN 202021736404U CN 212693239 U CN212693239 U CN 212693239U
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Abstract
The utility model discloses a car air conditioner compressor clutch developments actuation noise test system for test evaluation car compressor clutch actuation noise method under having the axle load. The test system comprises a motor driving platform and a compressor clutch to be tested, wherein the compressor clutch is provided with a belt pulley and an armature, an electromagnetic coil is arranged in the belt pulley of the compressor clutch and used for attracting the armature of the compressor clutch, the test system further comprises a rotating shaft support and a magnetic powder clutch, the rotating shaft support and the magnetic powder clutch are respectively and fixedly installed on the motor driving platform, the belt pulley of the compressor clutch is installed on the rotating shaft support through a bearing, a motor of the motor driving platform is in power connection with the belt pulley of the compressor clutch through a belt, a rotating shaft of the magnetic powder clutch and the armature of the compressor clutch are in rigid connection, and the magnetic powder clutch becomes an equivalent device of the shaft load of the compressor clutch. The test method comprises the following steps: testing conditions; a testing process; and (6) data processing.
Description
Technical Field
The utility model relates to a vehicle air conditioner compressor technical field especially relates to a vehicle air conditioner compressor clutch dynamic suction noise test system.
Background
1) The dynamic suction noise of the clutch is one of the main sources of the noise of the automobile air-conditioning compressor, the dynamic suction noise of the clutch in the existing test experiment is realized by simulating the suction noise of the compressor load, the variation uncertainty of the operating load condition exists in the suction and disconnection processes of the clutch, the fluctuation of the suction noise at each time is large, and the reason is the same.
2) The dynamic suction noise-based test method has complex requirements on test samples, different compressor installation modes and different structures, and has difference for quantitatively evaluating the noise of the compressor clutch.
3) Under the original mode of controlling the compressor running condition load through the equipment system, after single actuation disconnection action, the time that the system stabilizes to the test condition again is long, so that the test time of dynamic actuation noise is long, and the test stability and the test efficiency need to be improved.
4) The suction noise of the compressor belongs to an impact signal, when the impact signal is triggered and measured to be critical, and the amplitude of the impact signal is attenuated or the measurement is incomplete due to improper triggering moment.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a vehicle air conditioner compressor clutch developments actuation noise test system for test evaluation vehicle compressor clutch has the actuation noise under the axle load.
The purpose of the utility model is realized like this:
the utility model provides a vehicle air conditioner compressor clutch dynamic actuation noise test system, includes motor driver's platform, the compressor clutch that awaits measuring, the compressor clutch has belt pulley, armature, is equipped with solenoid in the belt pulley of compressor clutch for attract the armature of compressor clutch, still include pivot support, magnetic powder clutch, pivot support, magnetic powder clutch are fixed mounting respectively on the motor driver's platform, and the belt pulley of compressor clutch passes through the bearing and installs on the pivot support, and the motor of motor driver's platform passes through belt power with the belt pulley of compressor clutch and is connected, and the pivot of magnetic powder clutch, the armature rigid connection of compressor clutch make the magnetic powder clutch become the axle load equivalence device of compressor clutch.
Preferably, the rotating shaft of the magnetic powder clutch is a spline gear shaft, the spline end of the rotating shaft of the magnetic powder clutch is in spline fit with the armature of the compressor clutch, and the nut is locked, so that the rotating shaft part of the compressor clutch is replaced by the rotating shaft of the magnetic powder clutch, and the head cover part of the compressor clutch is replaced by the rotating shaft bracket.
Preferably, the device also comprises a microphone, which is arranged corresponding to the belt pulley and the armature of the compressor clutch and is used for acquiring the dynamic suction noise signal of the compressor clutch.
Preferably, the device further comprises a current sensor which is connected with the electromagnetic coil of the compressor clutch in series and is used for measuring a current signal of the electromagnetic coil of the compressor clutch.
A test method for dynamic suction noise of a clutch of an automobile air conditioner compressor adopts a test system, and comprises the following steps:
s1 test conditions
Converting the load of the compressor under the actual working condition into equivalent shaft torque, controlling the torque loaded on a rotating shaft of the magnetic powder clutch through the coil current of the magnetic powder clutch, further controlling the shaft load of the compressor clutch, enabling the shaft load of the compressor clutch to be equal to the equivalent shaft torque, and preloading the shaft load before the compressor clutch is attracted;
s2, test procedure
Measuring the suction noise under the load of the shaft, converting the collected dynamic suction noise signal of the compressor clutch into an electric signal through a microphone, and calculating to obtain a noise decibel value;
and, measuring the current signal of the compressor clutch solenoid at the same time;
s3, data processing
And carrying out noise total value operation on the noise measurement data result obtained in the test process.
Preferably, in step S2, determining a condition for triggering the microphone to collect the pick-up noise according to an electrical signal of an electromagnetic coil of the compressor clutch; and obtaining the time length for collecting the suction noise of the microphone according to the time length required by the suction process of the compressor clutch.
Preferably, in step S3, a dynamic suction noise curve of the compressor clutch and a current curve of the electromagnetic coil of the compressor clutch are drawn to obtain a current variation interval of the electromagnetic coil of the compressor clutch corresponding to the suction noise collection interval;
and determining the starting time and the stopping time of the total noise value calculation according to the current change interval of the electromagnetic coil of the compressor clutch.
Preferably, in step S1,
the power supply voltage of the electromagnetic coil of the compressor clutch is 12VDC, the attraction frequency is more than 10 times in the test process, and the maintaining time is 5-10 seconds after single attraction;
the frequency response range of the microphone is selected to be more than 20-20000 Hz, the dynamic amplitude is 120dB, and the position of a pull-in noise measuring point is selected to be 10-50cm away from the central axis of the clutch;
measuring a current signal of the electromagnetic coil of the compressor clutch through the series connection of the current sensor and the electromagnetic coil of the compressor clutch; the signal conversion period of the current sensor is less than 1ms so as to respond to a current dynamic signal at the moment of pull-in;
preferably, a plurality of measuring points are uniformly arranged along the circumferential direction of a belt pulley of the compressor clutch, whether the suction force of each suction contact position on the circumference is consistent or not is judged by measuring the difference of the suction noise of each measuring point when the clutch is sucked, and if the suction force is consistent, the clutch sample is judged to be normally installed.
Preferably, in step S1, the method for converting the load of the compressor under the actual operating condition into the equivalent shaft torque is as follows: before testing, the compressor runs the load of various working conditions on a performance experiment bench, and simultaneously, the shaft torque of the compressor is measured in real time by using a dynamic torque measuring device of the compressor, so that the measured torque value represents the load of the running of the compressor.
Since the technical scheme is used, the utility model provides a following problem:
1) the problem of dynamic suction noise fluctuation caused by shaft load fluctuation in the multiple dynamic suction process of the automobile air conditioner compressor is solved, and the stability of the test evaluation of the suction performance of the electromagnetic clutch under the dynamic load is ensured.
2) The utility model provides a problem that dynamic actuation in-process actuation noise signal triggers measurement opportunity inaccuracy.
The utility model discloses following beneficial effect has:
1. the standardized test standards for evaluating the suction noise and the dynamic suction noise of the compressor clutch are ensured, and the suction performance evaluation and the performance control of a clutch product are facilitated.
2. The method can be generalized to various types of clutch suction noise tests and has universality.
3. The resource occupation of the dynamic suction noise experiment test equipment is improved.
Drawings
FIG. 1 is a schematic diagram of a compressor clutch and a magnetic particle clutch;
fig. 2 is a schematic diagram of the system structure of the present invention;
FIG. 3 is a schematic flow chart of the method of the present invention;
FIG. 4 is a schematic view of a dynamic pull-in noise curve of a compressor clutch and a current curve of an electromagnetic coil of the compressor clutch;
fig. 5 is a schematic diagram of microphone distribution.
In the figure, 1 is a motor driving table, 2 is a compressor clutch, 21 is a belt pulley, 22 is an armature, 23 is an electromagnetic coil, 24 is a bearing, 25 is a shaft seal, 3 is a magnetic powder clutch, 31 is a rotating shaft, 4 is a rotating shaft bracket, and 5 is a microphone.
Detailed Description
Participate in figure 1, figure 2, a car air conditioner compressor clutch dynamic actuation noise test system, including motor driver platform 1, the compressor clutch 2 that awaits measuring, the compressor clutch has belt pulley 21, armature 22, is equipped with solenoid 23 in the belt pulley of compressor clutch for attract the armature of compressor clutch, still includes pivot support 4, magnetic powder clutch 3, pivot support, magnetic powder clutch are fixed mounting respectively on the motor driver platform, and the belt pulley of compressor clutch passes through bearing 24 to be installed on the pivot support, and the motor of motor driver platform passes through belt power with the belt pulley of compressor clutch and is connected, and the pivot 31 of magnetic powder clutch, the armature rigid connection of compressor clutch make the magnetic powder clutch become the axle load equivalence device of compressor clutch.
The rotating shaft of the magnetic powder clutch is a spline gear shaft, the spline end of the rotating shaft of the magnetic powder clutch is in spline fit with the armature of the compressor clutch, and the armature is locked by a nut, so that the rotating shaft part of the compressor clutch is replaced by the rotating shaft of the magnetic powder clutch, and the head cover part of the compressor clutch is replaced by the rotating shaft support.
The testing system also comprises a microphone, which is arranged corresponding to the belt pulley and the armature of the compressor clutch and is used for acquiring dynamic suction noise signals of the compressor clutch.
The test system further comprises a current sensor, wherein the current sensor is connected with the electromagnetic coil of the compressor clutch in series and is used for measuring a current signal of the electromagnetic coil of the compressor clutch.
Referring to fig. 3, a method for testing dynamic suction noise of a clutch of an automobile air conditioner compressor comprises the following test links:
1. compressor shaft load condition
The dynamic suction noise shaft load condition is converted into equivalent shaft torque according to the load condition of the compressor under the actual working condition, preloading is carried out before the clutch is sucked, and the preloading shaft torque of the automobile air conditioner compressor with the displacement of 60 cc-150 cc is recommended to be a value between 10N.m and 40 N.m.
2. Test conditions
The suction condition is as follows: in the test condition, the power supply voltage of the clutch coil is selected to be 12VDC, the attraction time is more than 10 times, and the attraction time is selected according to 5-10 seconds.
Microphone conditions: the frequency response range of the microphone is selected to be more than 20-20000 Hz, the dynamic amplitude is 120dB, and the position of a suction noise measuring point is selected to be 30cm away from the central axis of the clutch for measurement. See figure 2 for details.
The initial pick-up noise judgment position 3 is a measuring point at the circumferential direction 30cm of the clutch. See figure 5 for details.
Clutch current signal conditions: and a current sensor is selected to be connected in series in the clutch coil circuit for measurement. The signal conversion period of the current sensor is less than 1ms so as to respond to the current dynamic signal at the pull-in moment.
3. The testing steps are as follows:
when the position 1 is measured, the default position is the initial position of the circumference of the clutch, and the suction noise measurement is carried out for many times under the loading of the shaft load;
when the point position 2 is measured, the position of the microphone sensor is unchanged, and after the armature is disconnected, the armature rotates 120 degrees clockwise according to the circumference to measure the attraction noise for the second time.
When the point position 3 is measured, the position of the microphone sensor is unchanged, and after the armature is disconnected, the armature rotates for 120 degrees clockwise according to the circumference and then performs suction noise measurement for the third time.
As shown in FIG. 5, 3 noise measurement points are recommended to be arranged on a graph and mainly used for initial judgment and confirmation of clutch suction noise, and the effect of arranging a plurality of circumferential measurement points is to judge whether suction forces of suction contact positions on the circumference are consistent when the clutch is sucked by measuring the size and time interval difference of a suction noise result, because the difference of the suction forces can cause the amplitude difference of the suction noise, the noise difference information of the measurement point positions can judge whether the installation of a clutch sample is abnormal or not, whether unstable conditions such as double sound exist or not and the like exist, and the stability test evaluation of the clutch suction noise is influenced.
After the initial judgment and confirmation of the clutch actuation process, a formal test step is carried out, the position of a microphone sensor for testing is generally arranged at a position 10-50cm away from the center of a clutch, a rivet in a clutch armature is fixed at the same position to carry out more than 10 times of dynamic actuation noise measurement, and then noise amplitude results of multiple measurements are averaged, so that the purposes of stably testing and representing the actuation performance of the compressor clutch are achieved.
4. Dynamic suction noise data processing:
and according to the data result of the test process, performing noise total value operation on the attraction noise data through software, and calculating the initial moment of the noise according to the acquired clutch current signal as a trigger in the operation.
In the four parts, the test condition in the first part is the main utility model point, one of which, the utility model adopts the magnetic powder clutch as the equivalent device of the quantitative shaft load, uses the pre-loading torque of the rotating shaft to replace the actual shaft load of the automobile air-conditioning compressor, and accurately controls the loading torque on the rotating shaft of the magnetic powder clutch through the current of the coil of the magnetic powder clutch, then the rotating shaft of the magnetic powder clutch is rigidly connected with the compressor clutch, and replaces the original test condition of the shaft load controlled by the running condition of the compressor;
a set of rotating shaft support for installing and fixing the compressor pulley bearing is designed simultaneously, the rotating shaft support can be installed on a motor driving table, the rotating shaft support and a magnetic powder clutch are respectively installed and fixed on the motor driving table, a motor-driven compressor clutch pulley rotates at a certain rotating speed, one end of a rotating shaft of the magnetic powder clutch simulating the load of a compressor shaft is designed to be a spline gear shaft matched with an armature spline of the compressor clutch, and the rotating shaft and a head cover part of the compressor clutch are replaced by the rotating shaft of the magnetic powder clutch and the rotating shaft support. See figure 1 for details.
Two, it is two, the utility model discloses, the design is in four bibliographic categories, adopts the clutch coil current in the test condition as triggering test actuation instantaneous reference signal source, and electromagnetic clutch's theory of operation is exactly through the solenoid circular telegram to in the clutch, produces the axial electromagnetic force by coil current to the actuation face and the belt pulley actuation face actuation of actuation armature strike, produce the actuation noise, when having the axle load loading, the principle is the same, through the formula:
NI, F electromagnetic force, N coil turns, current in I coil.
The electromagnetic force generates acceleration of the armature attracting to the belt wheel attracting surface, after impact collision, metal vibration of a peripheral structure is excited, further, vibration is generated on a peripheral air medium, sound waves are formed, the sound waves are transmitted to the periphery in a radiation mode in a sound pressure signal mode, finally, the sound pressure sensing diaphragm of the microphone senses vibration and converts the vibration into an electric signal, and a noise decibel value is calculated.
F(τ)＝NI(τ)→ma(τ)→m1a(τ)H(τ)→P(τ)；
F (tau) is a function of electromagnetic force over time;
a (tau) is a function of the acceleration of the attraction disc along with time during attraction impact;
h (τ) a structural response transfer function of vibration of the clutch metal component over time caused by the shock;
p (τ) air sound pressure wave as a function of time;
m is the mass of the suction disc;
m1the mass of the suction disc and other parts of the clutch;
the above time sequence relationship before and after the trigger simulation time of the current signal and the pull-in noise sound pressure signal is shown in fig. 4.
By above process analysis, the selection electric current triggers as the actuation noise to measure can cover the acoustic energy radiation process in the actuation, and the selection electric current signal (if I0.5A, or other less electric currents) is as triggering the condition of gathering the actuation noise, and the rest only needs to select the actuation time, just can as actuation noise amplitude calculation time, the utility model discloses to through the time analysis of actuation process, often select 10ms ~ 50ms as long as calculating the duration of actuation noise.
The initial transmission in the process is started by the transmission of electric signals, so that the current signals are selected as trigger time signals to accurately hold the impact signal process of the attraction noise, and the attraction noise test integrity can be ensured by unifying the attraction noise trigger calculation time.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides a vehicle air conditioner compressor clutch dynamic actuation noise test system, includes motor driver platform, the compressor clutch that awaits measuring, the compressor clutch has belt pulley, armature, is equipped with solenoid in the belt pulley of compressor clutch for attract the armature of compressor clutch, its characterized in that: the magnetic powder clutch is characterized by further comprising a rotating shaft support and a magnetic powder clutch, wherein the rotating shaft support and the magnetic powder clutch are respectively and fixedly installed on the motor driving platform, a belt pulley of the compressor clutch is installed on the rotating shaft support through a bearing, a motor of the motor driving platform is in power connection with the belt pulley of the compressor clutch through a belt, and a rotating shaft of the magnetic powder clutch and an armature of the compressor clutch are in rigid connection, so that the magnetic powder clutch becomes an equivalent device of the shaft load of the compressor clutch.
2. The system for testing the dynamic suction noise of the automobile air conditioner compressor clutch according to claim 1, characterized in that: the rotating shaft of the magnetic powder clutch is a spline gear shaft, the spline end of the rotating shaft of the magnetic powder clutch is in spline fit with the armature of the compressor clutch, and the armature is locked by a nut, so that the rotating shaft part of the compressor clutch is replaced by the rotating shaft of the magnetic powder clutch, and the head cover part of the compressor clutch is replaced by the rotating shaft support.
3. The system for testing the dynamic suction noise of the automobile air conditioner compressor clutch according to claim 1, characterized in that: the microphone is arranged corresponding to a belt pulley and an armature of the compressor clutch and is used for acquiring dynamic suction noise signals of the compressor clutch.
4. The system for testing the dynamic suction noise of the automobile air conditioner compressor clutch according to claim 1, characterized in that: the current sensor is connected with the electromagnetic coil of the compressor clutch in series and used for measuring a current signal of the electromagnetic coil of the compressor clutch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021736404.4U CN212693239U (en) | 2020-08-19 | 2020-08-19 | Dynamic suction noise test system for automobile air conditioner compressor clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021736404.4U CN212693239U (en) | 2020-08-19 | 2020-08-19 | Dynamic suction noise test system for automobile air conditioner compressor clutch |
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| Publication Number | Publication Date |
|---|---|
| CN212693239U true CN212693239U (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021736404.4U Active CN212693239U (en) | 2020-08-19 | 2020-08-19 | Dynamic suction noise test system for automobile air conditioner compressor clutch |
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|---|---|
| CN (1) | CN212693239U (en) |
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2020
- 2020-08-19 CN CN202021736404.4U patent/CN212693239U/en active Active
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