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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振动与冲击 ›› 2021, Vol. 40 ›› Issue (10) : 73-80.

论文

朱海华，孟帆，宋汉文

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Visualization of vibration power flow in flat plates based on the digital image correlation method

ZHU Haihua，MENG Fan，SONG Hanwen

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摘要

通过振动功率流法研究了薄板结构振动能量的传递特性，基于数字图像相关(DIC)方法对功率流进行可视化。结构振强定义为薄板结构单位截面上的功率流，考虑各方向上的内力及质点响应，其矢量场能够清楚指明功率流的大小和方向。通过对振强及其散度场的可视化，可以直观表征结构能量的传递路径及振源位置。基于实验方法的结构振强测量，涉及被测结构表面位移场及速度场的空间导数，因此实验精度高度依赖于测量方法的空间分辨率及信噪比。数字图像相关方法作为一种非接触式的视觉测量分析手段，可对被测结构实现空间高分辨率的全场测量，且不改变系统固有特性。获得薄板结构的全场位移及速度响应，并基于空间傅里叶变换方法，在波数域上实现对空间域数据的微分计算，得到结构振强场。该研究通过对结构振强的实验研究，实现了对薄板结构振动能量传递路径及振源的可视化识别。

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.

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Key words

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

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朱海华，孟帆，宋汉文. 基于数字图像相关方法的薄板结构振动功率流可视化[J]. 振动与冲击, 2021, 40(10): 73-80

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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