Modal testing method, device and system for micro reticulated shell structure

Abstract

The invention relates to a modal testing method, a modal testing device and a modal testing system of a micro latticed shell structure. The modal testing method comprises the steps of arranging measuring points of a latticed shell structure to be tested according to an image, which is acquired by a laser head, of the latticed shell structure to be tested, wherein the latticed shell structure to be tested is fixed on a piezoelectric wafer, acquiring excitation signals outputted to the piezoelectric wafer by a signal generator, measuring vibration response signals of each measuring point when the piezoelectric wafer receives the excitation signals and generates vibrations, acquiring a frequency-response function of each measuring point corresponding to the excitation signals according to the excitation signals and the vibration response signals of each measuring point, and acquiring modal parameters of the latticed shell structure to be tested according to the frequency-response functions. According to the invention, a problem of modal testing above 20KHz is solved, the excitation energy loss is reduced, the utilization rate is high, the signal-to-noise ratio difference of vibration response is improved, the noise in the testing process is low, input signals are not required to be measured additionally, and the method is convenient and simple.

Description

technical field [0001] The invention relates to the technical field of modal testing, in particular to a modal testing method for a micro reticulated shell structure, a modal testing device for a micro reticulated shell structure and a modal testing system for a micro reticulated shell structure. Background technique [0002] Due to its unique mechanical properties, the micro-reticulated shell structure is often used as a key component of high-end precision electronic products, such as sensitive components of precision instruments, grids of grid-controlled traveling wave tubes, etc. Because of this, its dynamic characteristics have an important impact on the performance and reliability of precision electronic products. The modal test of the micro-reticulated shell structure is to obtain the modal parameters such as the natural frequency and mode shape of the structure by means of experiments, so as to accurately predict the response characteristics of the structure under var...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a modal test method, device and system for a micro-reticulated shell structure in response to the above problems, which can economically, efficiently and accurately obtain the modal parameters of the micro-reticulated shell structure. method, which solves the problems of narrow frequency band, low utilization rate of excitation energy, poor response signal-to-noise ratio and large noise at the test site in the sound excitation

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