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Local structural nonlinearities identification based on the minimum error linear frequency response function

机译:基于最小误差线性频率响应函数的局部结构非线性识别

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摘要

Purpose - The purpose of this paper is to consider the dynamic characteristics identification of local structural nonlinearities. Design/methodology/approach - Proposed identification method is based on minimum error linear frequency response function (MELF). Two different techniques are developed to extract nonlinear element's dynamic behavior from MELF. The first method, in which no pre-assumed model is considered for the nonlinearity mechanism behavior, is called "direct identification method." The second method is "model based identification method." Findings - Cubic stiffness dynamic characteristics are identified using the proposed techniques as a case study. Originality/value - The paper shows that the proposed identification technique is simple and free of any sophisticated measurement hardwares and constraints, which is required by most of the methods proposed so far.
机译:目的-本文的目的是考虑局部结构非线性的动力学特征识别。设计/方法/方法-提议的识别方法基于最小误差线性频率响应函数(MELF)。开发了两种不同的技术来从MELF中提取非线性元素的动态行为。第一种方法,其中不考虑非线性机制行为的预先假定模型,称为“直接识别方法”。第二种方法是“基于模型的识别方法”。研究结果-使用建议的技术作为案例研究,确定了立方刚度动态特性。原创性/价值-本文表明,提出的识别技术非常简单,并且没有任何复杂的测量硬件和约束,这是迄今为止提出的大多数方法所必需的。

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