通过时域反褶积和下采样实现实验脉冲子结构

IF 1.9 4区 工程技术 Q3 ENGINEERING, MECHANICAL
O.M. Zobel, F. Trainotti, D.J. Rixen
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引用次数: 0

摘要

动态子结构,特别是使用频率响应函数(FRF)的基于频率的变体(FBS),越来越受欢迎和重视,在数值和实验上都有无数成功的应用。然而,当确定对冲击的反应时,发现了一个缺点。从数值上讲,当必须考虑大量高频模式以正确预测冲击的响应幅度时,这可能会特别昂贵。在所有情况下,由于傅里叶变换的强制周期化,使用基于频率的子结构预测的初始响应可能是错误的。利用脉冲响应函数(IRF)的基于脉冲的子结构方法(IBS)可以完全避免频域并保留在时域中,从而消除这一缺点。虽然该方法已经成功地用于数值测试用例,但没有一个尝试的实验应用是成功的。本文在冲击分析的背景下,测试了IBS在一维杆上的实验应用,目的是正确预测最大驱动点响应峰值。讨论了与实验IBS应用相关的挑战,并通过限制通过低通滤波和下采样考虑的频率内容进行了改进尝试。结合基于纯粹时域的irf估计程序和对测量响应进行下采样的低通滤波应用,可以使用位移、速度和加速度在实验中正确预测具有IBS的棒的初始冲击响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enabling Experimental Impulse-Based Substructuring Through Time Domain Deconvolution and Downsampling

Dynamic substructuring, especially the frequency-based variant (FBS) using frequency response functions (FRF), is gaining in popularity and importance, with countless successful applications, both numerically and experimentally. One drawback, however, is found when the responses to shocks are determined. Numerically, this might be especially expensive when a huge number of high-frequency modes have to be accounted for to correctly predict response amplitudes to shocks. In all cases, the initial response predicted using frequency-based substructuring might be erroneous, due to the forced periodization of the Fourier transform. This drawback can be eliminated by completely avoiding the frequency domain and remaining in the time domain, using the impulse-based substructuring method (IBS), which utilizes impulse response functions (IRF). While this method has already been utilized successfully for numerical test cases, none of the attempted experimental applications were successful. In this paper, an experimental application of IBS to rods considered as one-dimensional is tested in the context of shock analysis, with the goal of correctly predicting the maximum driving point response peak. The challenges related to experimental IBS applications are discussed and an improvement attempt is made by limiting the frequency content considered through low-pass filtering and downsampling. The combination of a purely time domain based estimation procedure for the IRFs and the application of low-pass filtering with downsampling to the measured responses enabled a correct prediction of the initial shock responses of the rods with IBS experimentally, using displacements, velocities and accelerations.

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来源期刊
Experimental Techniques
Experimental Techniques 工程技术-材料科学:表征与测试
CiteScore
3.50
自引率
6.20%
发文量
88
审稿时长
5.2 months
期刊介绍: Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.
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