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Further Developments in the Dynamic Stiffness Matrix (DSM)-Based Direct Damping Identification Method

机译:基于动态刚度矩阵(DSM)的进一步发展 - 基于直接阻尼识别方法

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Theoretical development of a dynamic stiffness matrix (DSM)-based direct damping matrix identification method is revisited in this paper. This method was proposed to identify both the mechanism and spatial distribution of damping in dynamic structures as a matrix of general function of frequency. The objective of this paper, in addition to the review of the theoretical development, is to investigate some major issues regarding the feasibility of this method. The first issue investigated is how the errors in measured frequency response functions (FRF) affect the accuracy of the DSM. It was already known that the DSM is highly sensitive to errors that are present in the FRF. A detailed analytical and computational study is conducted, which finally leads to a sound physical explanation of the high sensitivity of the DSM to measurement errors. A new and also important conclusion is that the Leakages error drastically affects the accuracy of the computed DSM. The second major issue reported is the experimental implementation of the DSM-based method to minimize the Leakages error. Based on the findings presented in this study, a new and improved test setup is designed and developed, which enables the authors to obtain a good quality result that supports the theoretical and numerical analyses previously conducted.
机译:动态刚度矩阵(DSM)的理论为基础的发展直接阻尼矩阵识别方法在本文中被重新考虑。提出该方法以确定动态结构中阻尼的机制和空间分布作为频率的一般函数矩阵。本文的目的是,除了对理论发展的审查外,还要调查关于这种方法可行性的一些重大问题。调查的第一个问题是测量频率响应函数(FRF)中的错误如何影响DSM的准确性。已经知道DSM对FRF中存在的错误非常敏感。进行详细的分析和计算研究,最终导致对DSM的高灵敏度的声音理解到测量误差。一个新的和重要的结论是泄漏误差急剧影响计算机DSM的准确性。报告的第二个主要问题是基于DSM的方法的实验性实现,以最小化泄漏误差。基于本研究提出的结论,一个新的和改进的测试装置的设计与开发,使作者获得高质量的结果,以前进行支持的理论和数值分析。

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