含滞迟缓冲器的螺栓法兰连接结构稳态随机响应

摘要

Based on the simplified dynamic model of a bolted flange connection structure with hysteretic buffer, stationary random response of the structure under the longitudinal load of Gaussian white noise is studied through Monte Carlo simulation.In the simplified model, nonlinear springs with different stiffness of compression and tension are used to simulate the bolted flange connections, and the buffer in the upper part of the structure is modeled as a Yar-Hammond type bilinear hysteretic system.In this case, the rapid calculation of dynamical response for the corresponding cabin of spacecraft structure can be completed by using such simplified model.After nondimensionlization of the equation of motion, probability densities of stationary response are obtained through numerical simulation to reveal the evolution of stationary random response for different values of parameters.%基于螺栓法兰连接结构简化动力学模型,针对上部结构内包含滞迟缓冲机构的情况,通过蒙特卡洛数值模拟研究了高斯白噪声纵向载荷作用下的结构随机响应特性.在简化动力学模型中,通过拉压不同刚度的非线性弹簧表征螺栓法兰连接,上部缓冲机构用Yar-Hammond双线性滞迟系统描述,以便用于航天器对应舱段结构动力学响应的快速计算.在数值模拟之前对此系统进行了无量纲化,而后通过数值模拟分析了不同参数条件下的稳态响应概率密度函数,讨论了结构稳态随机响应的演化规律.