Method for indirectly measuring frequency response function of uncoupling interface of fragile component
A frequency response function, non-coupling technology, used in measurement devices, electrical digital data processing, special data processing applications, etc., can solve problems such as the difficulty of frequency response functions, the accuracy of theoretical modeling methods, and the accuracy of model parameters and boundary conditions. , to avoid dependencies
Inactive Publication Date: 2014-12-03
JIANGNAN UNIV
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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
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[0021] The method for measuring the frequency response function of extremely brittle parts of the present invention comprises the following steps:
[0022] (1) According to the extremely brittle part B to be tested ( figure 1 ) Boundary geometric conditions and physical conditions, select the appropriate additional component A;
[0023] (2) The additional component A arranges the acceleration sensor and measures its frequency response function H Acc ( 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 ABjc , H ABjj ( 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 as follows:
[0026] h Bcc...
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The invention discloses a method for indirectly obtaining a frequency response function of an uncoupling interface of a fragile component and belongs to the field of mechanical vibration. The method is mainly characterized in that according to a measured frequency response function HAcc of an additional component and measured frequency response functions HABcc, HABjc and HABjj of an assembly system, the method comprises the steps that (1) an acceleration sensor is arranged on the additional component and used for measuring the frequency response function HBcc of the additional component; (2) the fragile component is in rigid connection with the additional component, and a sensor is arranged on the assembled system and used for measuring the frequency response functions HABcc, HABic and HABii of the assembly system; (3) according to the measured frequency response function of the additional component and the frequency response functions of the assembly system, the frequency response function of the uncoupling interface of the fragile component is directly calculated. According to the method, the frequency response function of the uncoupling interface of the fragile component is predicted completely on the basis of the measured frequency response functions, and direct vibration excitation or vibration pick-up does not need to be conducted on the fragile component, so the method has the advantages that engineering application is easy and convenient, and the accuracy is high.
Description
technical field [0001] The invention relates to the technical field of mechanical vibration, in particular to an indirect acquisition method of the frequency response function of the non-coupling interface of an extremely brittle component. 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 freque...
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IPC IPC(8): G01H17/00G06F19/00
Inventor 王军段芳卢立新
Owner JIANGNAN UNIV