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Parameters identification by a single point free response measurement

机译:通过单点无响应测量进行参数识别

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摘要

When a thin rectangular plate is restrained on the two long edges and free on the remaining edges, the equivalent stiffness of the restraining joints can be identified by the order of the natural frequencies obtained using the free response of the plate at a single location. This work presents a method to identify the equivalent stiffness of the restraining joints, being represented as simply supporting the plate but elastically restraining it in rotation. An integral transform is used to map the autospectrum of the free response from the frequency domain to the stiffness domain in order to identify the equivalent torsional stiffness of the restrained edges of the plate and also the order of natural frequencies. The kernel of the integral transform is built interpolating data from a finite element model of the plate. The method introduced in this paper can also be applied to plates or shells with different shapes and boundary conditions.
机译:当矩形薄板被限制在两个长边上而其余边缘自由时,约束接缝的等效刚度可以通过使用单个位置处的板的自由响应所获得的固有频率的顺序来确定。这项工作提出了一种方法来确定约束接头的等效刚度,以简单地支撑板但弹性地限制其旋转来表示。积分变换用于将自由响应的自谱从频域映射到刚度域,以便识别板约束边缘的等效扭转刚度以及固有频率的阶数。积分变换的内核是根据板的有限元模型内插数据而构建的。本文介绍的方法还可以应用于具有不同形状和边界条件的板或壳。

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