基于数字图像相关方法的薄板结构振动功率流可视化

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Abstract The transfer characteristics of vibration energy in flat plate structures were studied by the power flow analysis method.In the method, the power flow was visualized based on digital image correlation(DIC).The structural intensity was defined as the power flow of the unit section of the thin plate, considering internal forces and particle responses comprehensively.Through the visualization of the structural intensity vector field, the transfer path of energy and the location of vibration source in the structure were visually characterized.The structural intensity measurement based on the experimental method involves the spatial derivative of the displacement field or velocity field on the surface of the measured structure.Therefore, the experimental precision depends on the spatial resolution and signal-to-noise ratio of the measurement method.As a non-contact visual measurement method, the digital image correlation method can achieve high spatial resolution in a full field measurement of the vibration structure without any change in the stiffness and mass of the system.The digital image correlation method can measure the whole field displacement and velocity of the measured structure, and based on the spatial Fourier transform method, the differential calculation of the spatial domain data can be implemented in the wavenumber domain, and further to obtain the structural intensity field.Through the experimental measurement of structural intensity, the visualization of the vibration energy flow and vibration source location of thin plate structures is realized.

Key words： digital image correlation(DIC) power flow spatial fourier transform energy transition vibration source location

Received: 09 December 2019 Published: 28 May 2021

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	Articles by authors
	ZHU Haihua
	MENG Fan
	SONG Hanwen

Cite this article:

ZHU Haihua,MENG Fan,SONG Hanwen. Visualization of vibration power flow in flat plates based on the digital image correlation method[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(10): 73-80.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I10/73

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