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Method for detecting very-fragile part uncoupling interface frequency response function

A frequency response function, non-coupling technology, applied in the field of mechanical vibration, can solve the problems of difficult frequency response function, the accuracy of theoretical modeling methods controlled by model parameters and the accuracy of boundary conditions, and achieve the effect of avoiding dependence

Inactive Publication Date: 2014-12-24
JIANGNAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, for some extremely fragile components, its frequency response function is difficult to test directly through experiments, and the accuracy of theoretical modeling methods is limited by the accuracy of model parameters and boundary conditions

Method used

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  • Method for detecting very-fragile part uncoupling interface frequency response function
  • Method for detecting very-fragile part uncoupling interface frequency response function
  • Method for detecting very-fragile part uncoupling interface frequency response function

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Experimental program
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Embodiment

[0021] The method for measuring the frequency response function of the non-coupling interface of the extremely brittle part of the present invention comprises the following steps:

[0022] (1) According to the extremely brittle part A to be tested ( figure 1 ) Boundary geometric conditions and physical conditions, select the appropriate additional part B;

[0023] (2) The additional component B arranges the acceleration sensor and measures its frequency response function H Bcc ( figure 2 );

[0024] (3) Rigidly connect the extremely brittle parts and additional parts, arrange sensors for the assembled system, and measure the frequency response function H of the assembled system ABcc , H ABic , H ABii ( image 3 );

[0025] (4) According to the measured frequency response function of the additional components and the frequency response function of the assembly system, the frequency response function of the extremely brittle component is directly calculated. Calculated ...

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Abstract

The invention discloses an obtaining method of a very-fragile part uncoupling interface frequency response function and belongs to the field of mechanical vibration. The method is mainly characterized in that according to a measured additional part frequency response function HBcc and assembled system frequency response functions HABcc, HABic and HABcii, the method comprises the following steps that (1) an acceleration sensor is arranged for an additional part, and the frequency response function HBcc of the acceleration sensor is measured; (2) a very-fragile part and the additional part are in rigid connection, a sensor is arranged for an assembled system, and the assembled system frequency response functions HABcc, HABic and HABcii are measured; and (3) according to the measured frequency response function of the additional part and the frequency response functions of the assembled system, the very-fragile part uncoupling interface frequency response function is directly computed. The very-fragile part uncoupling interface frequency response function is predicted based on the measured frequency response functions completely through the method, direct shock excitation or pick-up vibration on the very-fragile part is of no need, and the advantages such as construction application easiness and high accuracy are achieved.

Description

technical field [0001] The invention relates to the technical field of mechanical vibrations, in particular to a method for obtaining frequency response functions of non-coupling interfaces of extremely brittle components. Background technique [0002] The frequency response function is an important indicator for the dynamic quality evaluation of mechanical products. In addition, when performing dynamic quality analysis on a complex assembly system, the frequency response function of each component is generally obtained through theoretical or experimental testing methods, and then the substructure synthesis is performed to obtain the dynamic characteristics of the overall system. However, for some extremely fragile components, its frequency response function is difficult to test directly through experiments, and the accuracy of theoretical modeling methods is limited by the accuracy of model parameters and boundary conditions. The acquisition of the frequency response funct...

Claims

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Application Information

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IPC IPC(8): G01M7/02G01M13/00
Inventor 王军段芳卢立新
Owner JIANGNAN UNIV