Modal testing system and modal testing method on basis of single-point laser continuous plane-scanning vibration measurement

Abstract

The invention discloses a modal testing system and a modal testing method on the basis of single-point laser continuous plane-scanning vibration measurement. A workpiece to be tested is fixed on a vibration measurement probe of a vibration measurer so as to be driven to vibrate. The vibration measurer is used for performing sweep frequency analysis to the workpiece to be tested so as to find an inherent frequency of the workpiece; at the corresponding inherent frequency, vibration conditions of the workpiece are tested by means of continuously constant-speed plane-scanning vibration measurement through laser; the vibration data are processed by an analysis processing module; and further a modal vibration mode at the corresponding inherent frequency can be solved. According to finite element analysis and tests of thin-walled beams by the modal testing system and the modal testing method, the result that finite element models and test models are consistent basically is concluded.

Description

technical field [0001] The invention relates to a pure mode testing system and method of a vibrating object based on single-point laser continuous constant-speed plane scanning vibration measurement, which realizes full-view, high-precision and rapid testing of the pure mode of the vibrating object. Background technique [0002] As an important branch of vibration engineering theory, modal analysis is a discipline that studies the relationship between physical parameter models, modal parameter models and non-parametric models, and determines the theory and application of these system models by certain means. Modal analysis provides a powerful tool for structural design and performance evaluation of various products, and its reliable experimental results are often used as effective standards for product performance evaluation. It is an important development in the study of structural dynamic characteristics in the past thirty years to identify the dynamic model of the actual ...

AI Technical Summary

Problems solved by technology

However, since each point on the object to be measured has its own precise position and different vibration conditions, it is necessary to force the user to carefully select and arrange the measurement points, and invest a lot of time in the experimental measurement and final data processing. This will inevitably bring a lot of inconvenience to the experimental work.

Images