Application of the Bouc-Wen Model to Bolted Joint Dynamics
Application of the Bouc-Wen Model to Bolted Joint Dynamics
复制标题
Bouc-Wen 模型在螺栓连接动力学中的应用
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
J. Schoneman
中科院分区：
文献类型：
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作者：
D. Shetty;M. Allen;J. Schoneman
人们已经开发了各种数值模型来捕捉不同机械系统的动态、迟滞行为。其中一种半物理模型是 Bouc-Wen 模型，它以滞后方式将输入位移与输出恢复力联系起来。该公式适用于任何形式的磁滞，最初应用于机械和铁磁磁滞的力-偏转和磁通-电流图。众所周知，由于螺栓连接在一起的界面之间发生滑动，组合结构也会表现出迟滞行为。本文通过将 Bouc-Wen 模型与另一种常用的数值模型（Iwan 模型）进行比较，测试了 Bouc-Wen 模型在捕捉螺栓接头中观察到的幂律阻尼行为方面的有效性。虽然 Iwan 单元已被证明是稳健的，并且非常适合捕获能量耗散的幂律增加以及螺栓接口所表现出的刚度随振动幅度的缓慢下降，但其数值积分目前的计算成本很高。另一方面，Bouc-Wen 模型的时间积分效率更高，因此值得提出的研究。
Various numerical models have been developed to capture the dynamic, hysteretic behavior of different mechanical systems. One such semi-physical model is the Bouc-Wen model, which relates the input displacement to the output restoring force in a hysteretic way. This formulation is intended for any form of hysteresis and was originally applied to force – deflection and flux – current diagrams of mechanical and ferromagnetic hysteresis. Built-up structures are also known to show hysteretic behavior due to the slipping that occurs between interfaces bolted together. This paper tests how effective the Bouc-Wen model is in capturing the power-law damping behavior observed in bolted joints by comparing it with another commonly used numerical model – the Iwan model. While the Iwan element has been proven to be robust and well-suited at capturing the power-law increase in energy dissipation and slow decrease in stiffness with vibration amplitude exhibited by bolted interfaces, numerical integration of the same is currently computationally expensive. Time integration of the Bouc-Wen model, on the other hand, is much more efficient, thus warranting the proposed study.