A prepolarization microphone positioning device for NVH noise testing

Abstract

A prepolarization microphone positioning device for NVH noise testing comprises a base, a prepolarization microphone, a sensor chuck supporting shell, a universal adjustment mechanism, a guide drive wheel, a clamping drive wheel and a wireless laser ranging module, wherein the prepolarization microphone is fixed on the sensor chuck, the sensor chuck is fixed on the lower end of the universal adjustment mechanism, the upper end of the universal adjustment mechanism is mounted on a support shaft, a clamping drive wheel is arranged on the upper end of the support shaft, the support shaft is fixed on the base, the guide drive wheels are respectively located at the upper ends of the support shell, the guide drive wheels are symmetrically arranged above the clamping drive wheel, the guide drive wheels are connected to a drive mechanism for driving the guide drive wheels to rotate, and a wireless laser ranging module is installed on the support shell; the support shell is connected to the base through a limit adjustment nut, and a clamping spring is mounted on the limit adjustment nut. The present invention improves the efficiency in the arrangement process, reduces the error introduced by manual measurement, and achieves the purpose of rapid position adjustment.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and more specifically, relates to a prepolarization microphone positioning device dedicated to NVH noise testing. Background Art

[0002] Sensor accuracy and zero position are the most frequently involved parameters in noise test systems. Sound pressure level refers to a physical quantity that is consistent with people's subjective feeling of the strength of sound, and the unit is decibel. Prepolarized microphones are widely used in various noise test systems. In recent years, with the increasing popularity of new energy vehicles, the investment in the detection and research of new energy vehicle drive systems has also increased year by year, especially for the detection of automotive NVH performance. During the test, the test sample is installed on the test bench, and the prepolarized microphone is arranged according to the test outline to measure the noise emitted by the sample. In order to obtain accurate test data, the position of the microphone must be accurately arranged according to the test outline.

[0003] At present, the most common way to position the prepolarization microphone is manual measurement and arrangement. Using auxiliary items such as microphone stands, clips, and tape, the three-dimensional coordinates of the test piece are manually measured in front, to the left, to the right, above, and in front of the diagonal direction, and the microphone is fixed. The sensor is calibrated by a microphone calibrator before testing can be carried out. However, this method requires high personnel quality, and manual measurement and arrangement usually have large errors. The reflection surface brought by items such as microphone stands intervening in the sound field will introduce new uncertainties to the test results. In addition, the traditional manual arrangement method requires a lot of time to arrange each sensor. During the test, the status of the equipment may be checked and maintained. During this process, the test personnel will affect the test environment, causing the sensor position to shift. In this case, the sensor needs to be measured and arranged again. Summary of the invention

[0004] In order to overcome the shortcomings of the existing technology and to solve the problems of poor accuracy and low efficiency of the existing sensor layout, and difficulty in reproducing test results due to differences in layout positions, the present invention provides a prepolarization microphone positioning device specifically for NVH noise testing, which improves the efficiency of the layout process, reduces the errors introduced by manual measurement, and achieves the purpose of quickly adjusting the position.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A prepolarization microphone positioning device for NVH noise testing comprises a base, a prepolarization microphone and a sensor chuck, wherein the prepolarization microphone is fixed on the sensor chuck, the positioning device further comprises a support shell, a universal adjustment mechanism, a guide drive wheel, a clamping drive wheel and a wireless laser ranging module, wherein the sensor chuck is fixed at the lower end of the universal adjustment mechanism, the upper end of the universal adjustment mechanism is mounted on a support shaft, the clamping drive wheel is arranged at the upper end of the support shaft, the support shaft is fixed on the base, the guide drive wheels are respectively located at the upper ends of the support shell, the guide drive wheels are symmetrically arranged above the clamping drive wheel, the notches of the clamping guide wheel and the notches of the driving guide wheel are in the same vertical plane, a channel for a wire guide rail to be inserted is formed between the notches of the clamping guide wheel and the notches of the driving guide wheel, the guide drive wheel is connected to a drive mechanism for driving the guide drive wheel to rotate, and the wireless laser ranging module is mounted on the support shell; the support shell is connected to the base through a limit adjustment nut, and a clamping spring is sleeved on the limit adjustment nut.

[0007] Furthermore, the guide drive wheel is mounted on the upper portion of the support shell via a needle bearing.

[0008] Furthermore, the driving mechanism includes an intermediate driving wheel, which is coaxially arranged with the guide driving wheel, and is connected to the motor driving wheel via a transmission O-ring, and the motor driving wheel is installed on the output shaft of the stepper motor, and the stepper motor is located in the supporting shell, and a motor pressure cover is provided above the stepper motor, and the power supply end of the stepper motor is connected to the battery pack.

[0009] The sensor clamp is provided with a mounting hole for the prepolarization microphone to pass through, and a set screw is provided on a side wall of the mounting hole.

[0010] Each joint of the universal adjustment mechanism can be locked independently.

[0011] The limit adjustment nut adjusts the clamping level between the clamping guide wheel and the driving guide wheel by changing the distance between the limit adjustment nut and the base.

[0012] The intermediate drive wheel and transmission O-ring are provided with replacement parts of different radii for changing the transmission ratio.

[0013] In the present invention, the wire guide rail is inserted into the notch of the clamping guide wheel and the notch of the driving guide wheel through the opening of the shell, and the clamping spring is adjusted by the limit adjustment nut to clamp the wire guide rail. The battery pack provides power for the stepper motor and the wireless laser ranging module. The wireless laser ranging module is integrated in the control circuit. The control circuit is used to feed back the feedback value of the wireless laser ranging module and drive the stepper motor. The stepper motor is pressed against the shell through the motor gland and is perpendicular to the side wall of the shell. The stepper motor provides power to the motor drive wheel, drives the intermediate drive wheel through the transmission O-ring and passes through the needle bearing installed on the shell, and finally drives the guide drive wheel to drive the device to realize two-dimensional movement. The sensor chuck is used to clamp the prepolarization microphone and is fixed by the sensor set screw. Acoustic signal collection in all directions is realized by the universal adjustment device.

[0014] The clamping guide wheel groove and the driving guide wheel groove in the present invention are in the same plane, and the friction force with the steel wire can be changed by adjusting the clamping nut, and the steel wire can be tightened to a certain extent, reducing the position error caused by the device and the weight of the steel wire. The running direction of the device and the installation state of the steel wire should be kept horizontal, and the current position is fed back in real time by the wireless laser sensor. The controller determines the deviation between the current position and the set value and controls the forward and reverse installation of the stepper motor to adjust the position, so that fast real-time adjustment in two-dimensional direction can be achieved. The introduction of high-precision laser sensors will greatly reduce the errors introduced by manual measurement. The fast adjustment of the stepper motor can avoid the time of constantly adjusting the joints of the microphone stand during the manual arrangement process, greatly saving the test time.

[0015] The beneficial effects of the present invention are mainly manifested in: adopting automatic control, saving layout time, easy operation, and greatly reducing layout time; the laser distance measuring device can feedback the current position in real time and be adjusted by the controller, which can reduce the uncertainty factors introduced by manual measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the prepolarization microphone positioning device specially used for NVH noise testing.

[0017] Figure 2 This is the internal structure diagram of the prepolarization microphone positioning device specially used for NVH noise testing. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Reference Figure 1 and Figure 2A prepolarization microphone positioning device for NVH noise testing includes a needle bearing 1, a guide drive wheel 2, a limit adjustment nut 3, a clamping spring 4, a base 5, a support shell 6, an intermediate drive wheel 7, a transmission O-ring 8, a motor drive wheel 9, a universal adjustment device 10, a prepolarization microphone 11, a sensor set screw 12, a sensor chuck 13, a motor gland 14, a high-precision stepper motor 15, a clamping guide wheel 16, a wireless laser ranging module 17 and a battery pack 18. The prepolarization microphone 11 is fixed on the sensor chuck 13. The positioning device also includes a support shell 6, a universal adjustment mechanism 10, a guide drive wheel 2, a clamping drive wheel 16 and a wireless laser ranging module 17. The sensor chuck 13 is fixed at the lower end of the universal adjustment mechanism 10. The upper end of the universal adjustment mechanism 10 is installed on the support shaft, the upper end of the support shaft is provided with the clamping drive wheel 16, the support shaft is fixed on the base 5, the guide drive wheels 2 are respectively located at the upper ends of the support shell 6, the guide drive wheels 2 are symmetrically arranged above the clamping drive wheel 16, the notch of the clamping guide wheel 16 and the notch of the driving guide wheel 2 are in the same vertical plane, a channel for the wire guide rail 19 to be inserted is formed between the clamping guide wheel 16 and the driving guide wheel 2, the guide drive wheel 2 is connected to the driving mechanism for driving the guide drive wheel to rotate, and the wireless laser ranging module 17 is installed on the support shell 6; the support shell 6 is connected to the base 5 through a limit adjustment nut 3, and a clamping spring 4 is mounted on the limit adjustment nut 3.

[0020] Furthermore, the guide drive wheel 2 is installed on the upper part of the support shell 6 through a needle bearing 1.

[0021] Furthermore, the driving mechanism includes an intermediate driving wheel 7, which is coaxially arranged with the guide driving wheel 2, and the intermediate driving wheel 7 is connected to the motor driving wheel 9 via a transmission O-ring 8, and the motor driving wheel 9 is installed on the output shaft of the stepper motor 15, and the stepper motor 15 is located in the supporting shell 6. A motor pressure cover 14 is provided above the stepper motor 15, and the power supply end of the stepper motor 15 is connected to the battery pack 18.

[0022] The sensor clamp 13 is provided with a mounting hole for the prepolarization microphone 11 to pass through, and a set screw 12 is provided on a side wall of the mounting hole.

[0023] Each joint of the universal adjustment mechanism 10 can be locked independently.

[0024] The limit adjustment nut 3 adjusts the clamping level between the clamping guide wheel and the driving guide wheel by changing the distance between the nut and the base.

[0025] The intermediate drive wheel 7 and the transmission O-ring 8 are provided with replacement parts of different radii for changing the transmission ratio.

[0026] In this embodiment, the battery pack 18 provides power for the stepper motor 15 and the wireless laser ranging module 17. The wireless laser ranging module 17 is integrated into the control circuit, and the control circuit is used to feed back the feedback value of the wireless laser ranging module and drive the stepper motor 15. The stepper motor 15 is pressed against the support shell 6 through the motor gland 14 and is perpendicular to the side wall of the shell. The stepper motor 15 provides power for the motor drive wheel, drives the intermediate drive wheel 7 through the transmission O-ring 8 and passes through the needle bearing 1 installed on the shell, and finally drives the guide drive wheel 2 to drive the device to realize two-dimensional movement. The sensor chuck 13 is used to clamp the prepolarization microphone 11 and is fixed by the set screw 12. Acoustic signal collection in all directions is realized through the universal adjustment mechanism 10.

[0027] The clamping guide wheel groove and the driving guide wheel groove in the present invention are in the same plane, and the friction force with the steel wire can be changed by adjusting the clamping nut, and the steel wire can be tightened to a certain extent, reducing the position error caused by the device and the weight of the steel wire. The running direction of the device and the installation state of the steel wire should be kept horizontal, and the current position is fed back in real time by the wireless laser sensor. The controller determines the deviation between the current position and the set value and controls the forward and reverse installation of the stepper motor to adjust the position, so that fast real-time adjustment in two-dimensional direction can be achieved. The introduction of high-precision laser sensors will greatly reduce the errors introduced by manual measurement. The fast adjustment of the stepper motor can avoid the time of constantly adjusting the joints of the microphone stand during the manual arrangement process, greatly saving the test time.

[0028] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept and are for illustrative purposes only. The protection scope of the present invention should not be considered to be limited to the specific forms described in this embodiment, and the protection scope of the present invention also extends to equivalent technical means that can be thought of by ordinary technicians in this field based on the inventive concept.

Claims

1. A prepolarization microphone positioning device for NVH noise testing, comprising a base, a prepolarization microphone and a sensor chuck, wherein the prepolarization microphone is fixed on the sensor chuck, characterized in that: The positioning device also includes a supporting shell, a universal adjustment mechanism, a guide drive wheel, a clamping drive wheel and a wireless laser ranging module, the sensor clamp is fixed to the lower end of the universal adjustment mechanism, the upper end of the universal adjustment mechanism is installed on the supporting shaft, the clamping drive wheel is arranged on the upper end of the supporting shaft, the supporting shaft is fixed on the base, the guide drive wheels are respectively located at the upper ends of the supporting shell, the guide drive wheel is symmetrically arranged above the clamping drive wheel, the notch of the clamping drive wheel and the notch of the guide drive wheel are in the same vertical plane, a channel for the wire guide rail to be inserted is formed between the notch of the clamping drive wheel and the notch of the guide drive wheel, the The guide driving wheel is connected to a driving mechanism for driving the guide driving wheel to rotate, and the wireless laser ranging module is installed on the supporting shell; the supporting shell is connected to the base through a limit adjustment nut, and a compression spring is mounted on the limit adjustment nut; the driving mechanism includes an intermediate driving wheel, which is coaxially arranged with the guide driving wheel, and the intermediate driving wheel is connected to the motor driving wheel through a transmission O-ring, and the motor driving wheel is installed on the output shaft of the stepper motor, and the stepper motor is located in the supporting shell, and a motor pressure cover is provided above the stepper motor, and the power supply end of the stepper motor is connected to the battery pack, and each joint of the universal adjustment mechanism can be locked independently.

2. The prepolarization microphone positioning device for NVH noise testing according to claim 1, characterized in that: The guide driving wheel is mounted on the upper part of the supporting shell through a needle bearing.

3. The prepolarization microphone positioning device for NVH noise testing according to claim 1 or 2, characterized in that: The sensor clamp is provided with a mounting hole for the prepolarization microphone to pass through, and a set screw is provided on a side wall of the mounting hole.

4. The prepolarization microphone positioning device for NVH noise testing according to claim 1 or 2, characterized in that: The limit adjustment nut adjusts the clamping level between the clamping guide wheel and the driving guide wheel by changing the distance between the limit adjustment nut and the base.

5. The prepolarization microphone positioning device for NVH noise testing according to claim 1 or 2, characterized in that: The intermediate drive wheel and transmission O-ring are provided with replacement parts of different radii for changing the transmission ratio.

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