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Non-stationary stochastic vibration analysis of fuzzy truss system

机译:模糊桁架系统的非平稳随机振动分析

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摘要

A new method (fuzzy factor method based on the fuzzy sets theory) for the dynamic response analysis of fuzzy truss system under non-stationary stochastic excitation is presented. Considering the fuzziness of the structural physical parameters and geometric dimensions simultaneously, the fuzzy correlation function matrix of the structural displacement response in time domain is derived using the fuzzy factor method and the optimisation method; then from the structural non-stationary stochastic response in the frequency domain, the fuzzy mean square values of the displacement and stress response are developed by the fuzzy factor method. The influences of the fuzziness of the physical parameters and geometric dimensions on the fuzziness of the mean square values of the structural displacement and stress response are illustrated via two engineering examples and some important conclusions are obtained.
机译:提出了一种基于非平稳随机激励的模糊桁架系统动力响应分析的新方法(基于模糊集理论的模糊因子方法)。同时考虑结构物理参数和几何尺寸的模糊性,采用模糊因子法和优化法推导了结构位移响应的时域模糊相关函数矩阵。然后根据频域中的结构非平稳随机响应,采用模糊因子方法建立位移和应力响应的模糊均方值。通过两个工程实例说明了物理参数和几何尺寸的模糊性对结构位移和应力响应均方值的模糊性的影响,并得出了一些重要的结论。

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