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Effects of distributed structural dynamic modification with reduced degrees of freedom

机译:降低自由度的分布式结构动力修改的效果

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摘要

The aim of this study is to investigate means of efficiently assessing the effects of distributed structural modification on the dynamic properties of a complex structure. Although structural modification has been demonstrated as an efficient method for one-dimensional distributed modification with/without additional degrees of freedom (DOFs), like beam modification, research into structural modification of two-dimensional (2D) structures and/or with reduced DOFs has been limited. In this paper, structural modification has been applied to a plate clamped on all four edges in which a rectangular hole is cut out in the center as modification. The frequency response functions (FRFs) of the original unmodified plate were obtained experimentally as well as numerically. The delta dynamic stiffness matrix was determined numerically by modeling the cut out and part of the original structure. The FRFs of the modified plate are computed by coupling the original FRFs and the delta dynamic stiffness matrix. Good agreement is obtained between the FRFs of the modified plate determined experimentally and those obtained by numerical modeling of the complete modified structure. Structural modification method has been verified on 2D structure for distributed modifications with decreasing in DOFs.
机译:这项研究的目的是研究有效评估分布式结构修改对复杂结构的动力学特性的影响的方法。尽管已经证明结构修改是一种有/无附加自由度(DOF)的一维分布式修改的有效方法,例如光束修改,但是对二维(2D)结构的结构修改和/或具有减小的DOF的研究已经展开被限制。在本文中,结构修改已应用于夹紧在所有四个边缘上的板,该板的中心在中心开了一个矩形孔作为修改。原始未修饰板的频率响应函数(FRF)是通过实验和数值获得的。通过对切口和原始结构的一部分进行建模,可以确定数值的动态刚度矩阵。通过将原始FRF与增量动态刚度矩阵耦合来计算修改板的FRF。通过实验确定的修饰板的FRF与通过完整修饰结构的数值模型获得的FRF之间具有良好的一致性。已经针对二维结构验证了结构修改方法,以实现随DOF减少而进行的分布式修改。

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