Dynamic absorber frequency testing method

A technology of a dynamic vibration absorber and a test method, which is applied to vibration measurement in solids, vehicle suspension/shock absorption mechanism testing, instruments, etc. Considering the temperature and other issues, the effect of improving R&D efficiency and shortening the time period of trial production and development

Active Publication Date: 2017-09-08
JIANGLING MOTORS
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Problems solved by technology

However, this test method uses the traditional hammer test method. Due to the non-linear characteristics of the rubber of the vibration absorber, the frequency of the vibration absorber is affected by the force of the hammer and cannot be ignored, so the repeatability of the test results of this method is not high.
And this test method still does not take into account the influence of temperature on the rubber stiffness, so the test device and test method cannot accurately test the frequency of the dynamic vibration absorber

Method used

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  • Dynamic absorber frequency testing method
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  • Dynamic absorber frequency testing method

Examples

Experimental program
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Embodiment

[0034] Example: see Figure 1 to Figure 10 .

[0035] A method for testing the frequency of a dynamic vibration absorber, the characteristic steps of which are as follows:

[0036] Step 1: Use the dynamic vibration absorber modal test bench 2 to simulate the boundary conditions of the dynamic vibration absorber on the vehicle, including temperature and excitation force, and test its comprehensive frequency response on the dynamic vibration absorber modal test bench 2 The function SUM, the operation steps are as follows:

[0037] (1) First determine the parts of the test vehicle that produce low-speed roar in the power transmission system, then determine the natural frequency of the parts, and assemble the dynamic vibration absorber 1 that needs to be tested and modulated at the parts;

[0038] (2) An acceleration vibration sensor and a near-field temperature sensor are arranged on the dynamic vibration absorber 1 to collect the acceleration time-domain signal and near-field ...

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Abstract

The invention relates to the vehicle NVH field and more particularly, to a dynamic absorber frequency testing method, comprising: through a temperature and an exciting force, which are boundary conditions obtained by a station frame simulating dynamic absorber on an entire vehicle accurately obtaining the absorber frequency; arranging the testing points for the station frame vibration exciter and processing the data; modulating the dynamic absorber frequency; and verifying the dynamic absorber frequency accuracy. The beneficial effects of the method proposed by the invention are as follows: 1) the method puts forward the boundary conditions that influence the dynamic absorber frequency: the magnitude of the exciting force and the working temperature; 2) through the simulation of the boundary conditions for the dynamic absorber, it is possible to test out the dynamic absorber frequency, and with the application of a simple intrinsic frequency theoretical equation, it is possible to work out a dynamic absorber that meets the frequency requirement; and 3) with the method, the time period taken by a vehicle main machine factory to test and develop the dynamic absorber can be shortened and the research efficiency for the dynamic absorber is raised.

Description

technical field [0001] The invention relates to the field of automobile NVH, in particular to a method for testing the frequency of a dynamic vibration absorber. Background technique [0002] With the control of vehicle airtightness indicators and the continuous optimization of acoustic packages by automobile OEMs, medium and high-frequency noise has been well controlled and reduced, and the problem of vehicle roar caused by low-frequency resonance in the power transmission system has become more and more prominent. Therefore, it is becoming more and more important to solve the problem of vehicle roar caused by low-frequency resonance of the power transmission system. At present, there are two main methods for automobile OEMs to solve this problem: the first method is to optimize the system or component structure that causes this low-frequency resonance, and separate its natural frequency to avoid resonance; the second method is to design a dynamic vibration absorber with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/04G01H1/14
CPCG01H1/14G01M17/04
Inventor 邓欣王轮钟秤平段龙扬张小红吴赵生谢明睿
Owner JIANGLING MOTORS
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