【摘要】 针对复合板的热诱导结构振动问题,提出一种新的混合单元计算模型,将三维和二维单元组成混合单元,利用不同类型单元体现复合结构中不同的材料特性,实现对真实复合结构物理特征的高精度模拟。在此基础上基于虚功原理建立了三维形式的复合板瞬态热弹性动力学方程,利用该方法对空间大尺度复合薄板的热诱导扰动进行研究。仿真结果表明,结构固有频率和热容是决定热诱导振动发生的主要内因,对于一些刚度较大的空间复合薄板,由于空间约束环境弱,整体频率低易发生热诱导结构振动。本研究对于空间大尺度复合平板结构的工程设计具有一定的参考价值。更多还原

【Abstract】 A new hybrid element model for thermally induced structural vibration of a composite plate is presented,which simulates physical characteristic of composite structures with a high precision.The different kinds of elements denote that different thermal elastic characteristics of different materials.The three-dimension multi-physics coupling transient elastic dynamic equations for the composite plate are founded based on the Galerkin’s method.Its thermally induced vibrations are studied.The simulation results indicate the structure natural frequencies and its thermal capacity are the main factors causing thermally induced vibration.Due to weak restrictions and low frequencies of some spatial large scale plates,their thermally induced vibrations may happen easily.This study has higher reference value for engineering design of spatial large scale composite plates.更多还原