考虑热应力、热变形正交各向异性板的动特性及响应规律  

RESEARCHES ON VIBRATION CHARACTERISTIC AND DYNAMIC RESPONSE OF ORTHOTROPIC PLATE WITH THERMAL STRESS AND DEFORMATION

作　　者：胡君逸 李跃明[1] 李海波[2] 程昊[2] HU Jun-yi;LI Yue-ming;LI Hai-bo;CHENG Hao(State Key Laboratory for Strength and Vibration of Mechanical Structures,Shaanxi Key Laboratory of Environment and Control for Flight Vehicle,Xi’an Jiaotong University,Shaanxi 710049,China;Science and Technology on Reliability and Environment Engineering Laboratory,Beijing Institute of Structures and Environment Engineering,Beijing 10076,China)

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室,陕西710049 [2]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《工程力学》2018年第8期218-229,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(11321062)

摘　　要：该文开展了热环境下正交各向异性板固有特性和激励响应的研究,通过实验测试与数值计算,分析了其固有频率随温度的变化规律、模态交换或突跳现象、以及激励作用下响应受温度的影响。结果表明:温度引起的热应力与热变形会改变板的动态特性,但两者在热屈曲前后对板刚度的影响机制不同,导致固有频率随温度先降低后上升,且它们的微小变化会导致正交各向异性板的模态交换或突跳现象;激励作用下整体响应曲线随温度升高向低频漂移。This paper focuses on the study of the natural vibration characteristics and dynamic response of an orthotropic plate under thermal environment by means of experiment and numerical calculation.The variation of natural frequency as well as the interchange of the mode shape and response under excitation during thermal environment are the key points in this research.The result shows that the thermal stresses and thermal deformation due to thermal loading will change the dynamic characteristics of an orthotropic plate.The thermal stresses and thermal deformation are of different effects on the stiffness of the plate,will result in a trend that the fundamental frequency firstly lowers and then rises,and whose slight variation leads to a mode-shape interchange of the plate.The dynamic response curve shifts to the low frequency range with temperature rising.

关 键 词：正交各向异性板 热应力 热变形 模态振型 动态响应 

分 类 号：O327[理学—一般力学与力学基础]