栓接结合部在动载荷下的能量耗散特性

发布时间：2018-02-21 04:09

本文关键词： 栓接结合部能量耗散特性 Bouc-Wen模型参数辨识　出处：《机械工程学报》2016年13期 　论文类型：期刊论文

【摘要】：研究栓接结合部在动载荷下的能量耗散特性,对描述机械系统复杂力学行为具有重要的理论和实际意义。利用Bouc-Wen模型模拟栓接结合部的迟滞非线性特性,提出在动载荷下系统能量耗散计算方法和参数辨识方法。为验证所提方法的正确性,利用Mindlin模型所仿真出的非线性迟滞曲线作为栓接结合部所获得的试验数据,对Bouc-Wen模型进行参数辨识,并采用力控制方式分析Bouc-Wen模型中各个参数对系统能量耗散特性的影响规律。结果表明:随着量纲一切向力的增加量纲一能量耗散随之非线性递增;参数A、δ、γ和n对能量耗散的影响与其灵敏度相关,灵敏度越大则能量耗散的递增速率也越大;能量耗散随着参数A、γ和n的增加而增加,但参数δ则反之;栓接结合部能量耗散不仅与Bouc-Wen模型中的参数相关,而且与系统激励频率和振幅非线性相关;量纲一切向力与量纲一能量耗散之间关系可表示为η=aΓb的函数形式。
[Abstract]:It is of great theoretical and practical significance to study the energy dissipation characteristics of the bolted joints under dynamic loading. The Bouc-Wen model is used to simulate the hysteretic nonlinearity of the bolted joints. In order to verify the correctness of the proposed method, the nonlinear hysteresis curve simulated by the Mindlin model is used as the experimental data of the bolted joint. The parameter identification of Bouc-Wen model is carried out, and the influence of each parameter in Bouc-Wen model on the energy dissipation characteristics of the system is analyzed by force control method. The results show that the dimensionality energy dissipation increases with the increase of dimensionality. The effect of parameters A, 未, 纬 and n on energy dissipation is related to its sensitivity, and the increasing rate of energy dissipation increases with the increase of parameters A, 纬, 纬 and n, but the parameter 未 is not. The energy dissipation of the bolted joint is not only related to the parameters in the Bouc-Wen model, but also to the nonlinear excitation frequency and amplitude of the system, and the relationship between all dimensional forces and dimensional-energy dissipation can be expressed as the functional form of 畏 -a 螕 b.
【作者单位】：西安建筑科技大学机电工程学院;北京工业大学机械工程与应用电子技术学院;
【基金】：国家自然科学基金(51305327,51475352) 高等学校博士学科点专项科研基金(20136120120020) 陕西省自然科学基金(2014JQ7270)资助项目
【分类号】：TH131.3

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