Test modal analysis method based on base reduction method

A technology of test mode and analysis method, which is applied in the direction of machine/structural component testing, vibration testing, measuring devices, etc., and can solve problems such as difficulty in proving the convergence of iterative formats, low convergence speed, and large amount of calculations
CN101464205AInactive Publication Date: 2009-06-24HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN UNIV
Publication Date
2009-06-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

An experimental modal analysis method based on the reduced-basis method comprises the following steps: (1), organizing the preparation for experimental model analysis; (2), collecting dynamic signals, and utilizing LabVIEW imaging software to preprocess the signals in order to obtain a frequency response input-output transfer function matrix; (3), realizing the reduced-basis method in a LabVIEW-embedded Matlab program in order to obtain modal parameters including extreme points and modal participation factors; (4), setting up a stabilization diagram and evaluating the mode of vibration; (5), verifying the mode and comparing the result with other arithmetic methods, correcting the parameters of the reduced-basis method to re-calculate the modal parameters in the case that the result comparison is inconsistent with the requirement, and proceeding to the next step in the case that the result comparison is consistent with the requirement; and (6), making the animation of the mode and finalizing the design of the system. In order to scale down the degree of freedom, the invention projects a large-scale matrix to a small-scale matrix, thereby greatly accelerating calculation reducing experiment intensity and time, greatly improving experimental efficiency and greatly enhancing experiment accuracy.
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Description

technical field

[0001] The present invention mainly relates to the field of test modal analysis methods, and in particular refers to a test modal analysis method based on the subtraction method, which is mainly applied to large or extra-large measured objects such as automobiles, airplanes, submarines, and large building bridges. Experimental modal analysis. Background technique

[0002] The process of test modal analysis consists of three parts: test preparation process, digital signal acquisition and processing, and modal parameter identification. The experimental preparation process includes the installation of the experimental platform, the hoisting of the experimental product, the drawing of the geometric size of the experimental product, the selection of the sensor layout, the installation and debugging of the sensor, etc. The work at this stage is how to use the results of finite element theoretical modal analysis (if there is no theoretical analysis result, it is ne...

Claims

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