摘要
以薄铝板为研究对象,采用杜阿梅尔-诺依曼线性结构理论分析温度场对结构固有振动的影响。温度对结构固有频率的影响主要在于,结构温度变化不均匀,热变形不能自由进行,在物体中产生拉压热应力,使得结构局部刚度增加或减小,改变了初始结构刚度分布,同时温度也会对结构的材料属性产生影响,因此可将结构刚度看作是由热效应引起的初应力刚度和结构自身的几何刚度的叠加,通过仿真分析发现热效应会使结构的固有振动频率降低,还会产生频率跃。
Duarte Mel-Neumann linear theory is used to analyze the impact of temperature on the natural frequencies of the structure with thin plate.Uneven temperature change and unfreeze thermal deformation cause temperature gradient which generates non-uniform thermal stress.and the stiffness of the structure will be changed,and the temperature at the same time also have an impact on structural properties of materials.So the structural stiffness can be regarded as the superposition of the initial stress stiffness caused by the thermal effect and the geometric stiffness.By finite element calculation,thermal effects make the natural vibration frequency of a structure lessening,and there is a frequency step.
出处
《工业建筑》
CSCD
北大核心
2013年第S1期334-336,共3页
Industrial Construction
关键词
热载荷
有限元
薄板
热应力
thermal load
FEM
thin plate
thermal stress
