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使用数字图像相关技术的模态分析

Modal Analysis Using Digital Image Correlation Technique.

作者信息

Frankovský Peter, Delyová Ingrid, Sivák Peter, Bocko Jozef, Živčák Jozef, Kicko Michal

机构信息

Faculty of Mechanical Engineering, Technical University of Košice, Letná 9, 042 00 Košice, Slovakia.

出版信息

Materials (Basel). 2022 Aug 17;15(16):5658. doi: 10.3390/ma15165658.

DOI:10.3390/ma15165658
PMID:36013796
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9416569/
Abstract

The present paper discusses a new approach for the experimental determination of modal parameters (resonant frequencies, modal shapes and damping coefficients) based on measured displacement values, using the non-contact optical method of digital image correlation (DIC). The output is a newly developed application module that, based on a three-dimensional displacement matrix from the experimental measurement results, can construct a frequency response function (FRF) for the purpose of experimental and operational modal analysis. From this frequency response function, the modal parameters of interest are able to be determined. The application module has been designed for practical use in Scilab 6.1.0, and its code interfaces directly with the ISTRA4D high-speed camera software. The module was built on measurements of a steel plate excited by an impact hammer to simulate experimental modal analysis. Verification of the correctness of the computational algorithm or the obtained modal parameters of the excited sheet metal plate was performed by simulation in the numerical software Abaqus, whose modal shapes and resonant frequencies showed high agreement with the results of the newly developed application.

摘要

本文讨论了一种基于测量位移值，使用数字图像相关（DIC）非接触光学方法来实验确定模态参数（共振频率、模态形状和阻尼系数）的新方法。输出结果是一个新开发的应用模块，该模块基于实验测量结果的三维位移矩阵，能够构建频率响应函数（FRF），用于实验模态分析和运行模态分析。通过这个频率响应函数，可以确定感兴趣的模态参数。该应用模块已设计用于Scilab 6.1.0中的实际应用，其代码直接与ISTRA4D高速相机软件接口。该模块基于用冲击锤激励钢板的测量来构建，以模拟实验模态分析。通过在数值软件Abaqus中进行模拟，对计算算法的正确性或所获得的受激金属板模态参数进行了验证，其模态形状和共振频率与新开发应用的结果高度吻合。

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