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Test method of acoustic vibration transfer function of suspension absorber vehicle body attaching points

A transfer function and shock absorber technology, which is applied in the field of acoustic-vibration transfer function test of the attachment point of the suspension shock absorber body, and can solve problems such as differences in test results

Active Publication Date: 2017-01-04
HEFEI CHANGAN AUTOMOBILE +1
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  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since most of the front and rear suspension shock absorbers are connected to the vehicle body through more than 2 bolts, the test results are significantly different from the CAE analysis results by using the above two test methods for exciting attachment points one by one

Method used

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  • Test method of acoustic vibration transfer function of suspension absorber vehicle body attaching points
  • Test method of acoustic vibration transfer function of suspension absorber vehicle body attaching points
  • Test method of acoustic vibration transfer function of suspension absorber vehicle body attaching points

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Embodiment Construction

[0029] The test device for the acoustic-vibration transfer function of the attachment point of the suspension shock absorber body includes: a suspension shock absorber 1, a force hammer 2, a microphone, a data acquisition front end, a processing device and a tooling part 5.

[0030] Test preparation: The state of the prototype car is the state of the interior and body, make sure the doors and sunroof are closed.

[0031] Such as image 3 As shown, the tooling part 5 includes: a base 10, a boss 9, and a base through hole 11; the base 10 is an equilateral triangle with rounded corners, a cylindrical boss 9 is welded in the center, and a base through hole is distributed at each of the three corners. 11. The position and size of the base through hole 11 is matched with the installation through hole 3 of the suspension shock absorber. The material of the tooling parts is aluminum, the thickness of the base 10 is 12.7 mm, the diameter of the cylindrical boss 9 is 25 mm, the height ...

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Abstract

The invention provides a test apparatus of an acoustic vibration transfer function of suspension absorber vehicle body attaching points. The apparatus comprises a force hammer, a microphone, a data acquisition front end, a processing device, and a tool part, the tool part is arranged on a front suspension absorber and a rear suspension absorber, the free boundary test state of an acoustic vibration test is simulated, and the acoustic vibration transfer functions of the front suspension absorber and the rear suspension absorber are tested by knocking the tool part by the force hammer. According to the usage of the tool part, on one hand, the attaching points of the front suspension absorber and the rear suspension absorber of a test vehicle are close to the boundary condition of the real vehicle and are the same as the CAE simulation boundary condition; on the other hand, the test of the acoustic vibration transfer function in the X, Y and Z directions is facilitated. By employing the test method, the acoustic vibration transfer function of the attaching points of the vehicle body front and rear suspension absorbers to the human ear in the vehicle can be accurately and effectively tested.

Description

technical field [0001] The invention relates to the technical field of NVH of a vehicle body, in particular to a method for testing a sound-vibration transfer function of a vehicle body attachment point of a suspension shock absorber. Background technique [0002] The low-frequency noise control inside the car has always been one of the research hotspots of major OEMs, especially for today's rapid development of automotive industry technology, the control of low-frequency noise inside the car has become one of the symbolic technical requirements of high-end automotive products . The premise of successful low-frequency noise control is to accurately test the acoustic-vibration characteristics of the car body structure itself. Effective control and enhancement of low frequency noise levels. [0003] There are currently two methods for testing the vibration-acoustic transfer function from the vehicle body attachment point of the front and rear suspension shock absorbers to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/04
CPCG01M17/04
Inventor 许春民万玉平张杰武建双雷洋王二保
Owner HEFEI CHANGAN AUTOMOBILE
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