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Method for testing local mode of automotive sheet part

A technology of modal testing and testing methods, applied in the testing of machine/structural components, vibration testing, measuring devices, etc., can solve problems such as the increase of testing accuracy errors, suppress local vibration, improve testing efficiency, and save testing time Effect

Active Publication Date: 2014-02-12
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

When applying the hammer excitation method to the modal test of the door outer panel, on the one hand, the door outer panel is a metal thin-walled part, which is a nonlinear system; on the other hand, the sensor pasted on the door outer panel will cause additional mass, which will The test accuracy error becomes larger

Method used

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  • Method for testing local mode of automotive sheet part
  • Method for testing local mode of automotive sheet part
  • Method for testing local mode of automotive sheet part

Examples

Experimental program
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Embodiment Construction

[0022] Taking the outer panel of the car door as an example below, the present invention will be further described in conjunction with the accompanying drawings.

[0023] Step 1: The hanger 2 is suspended on the vehicle through the wire rope 1. Simulate the "free-free" boundary condition, hang the door outer panel 4 (excluding door interior parts, glass regulators, glass, rearview mirror, etc.) on the hanger 2 with a soft rubber rope 3, and suspend the door outer panel The connection point should be selected on the window frame of the car door, so that the car door is in a horizontal and free state, see figure 1 .

[0024] Step 2: Select several excitation points for pre-test, repeated debugging, and select the point that can best stimulate the frequency response function of the door as the pre-selected best excitation point (that is, the best excitation position), which usually has a higher local stiffness. In this example, when the door is in a horizontal free state, the ...

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Abstract

The invention discloses a method for testing the local mode of an automotive sheet part. A white noise signal is used as an excitation source. The method comprises the steps as follows: a tested sheet part is suspended, a point which can excite a frequency-response function of the tested sheet part most is selected as a primary optimal excitation point, a connection instrument adopts the optimal excitation point, the sheet part is tested by a laser vibrometer, and test data are saved; and the tested data are subjected to data analysis, the frequency-response function of the sheet part is obtained, and a mode shape for testing an outside plate of an automotive door is obtained. According to the method, the laser vibrometer is used, a test object model is not required to be established, effects of structural nonlinearity and added mass on test precision can be avoided, the test time is saved, the test precision is guaranteed, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the field of automobile vibration testing, in particular to a local mode testing method for thin-plate parts of automobiles. Background technique [0002] There are many thin-plate parts on the car, such as door outer panels, body side panels, front panel panels, and roof panels, which are usually thin-walled metal structures. They are closely related to the vibration and noise of the vehicle. Taking the outer panel of the car door as an example, on the one hand, during the driving process of the vehicle, the outer panel of the door is excited by the engine, road surface and suspension, which causes the outer panel of the door to vibrate, resulting in the radiation of noise to the passenger compartment due to the vibration of the outer panel of the door. On the other hand, during the opening and closing process of the car door, especially when the door is closed, the outer panel of the car door is subjected to severe impact, r...

Claims

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Application Information

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IPC IPC(8): G01H9/00G01M7/02
Inventor 许春民张军贾文宇张杰董国旭
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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