【作者】 许斌； 杨炳渊； 张文；

【Author】 Xu,Bin~(1,2),Yang Bingyuan~2,Zhang Wen~1 (Department of Mechanics and Engineering Science,Fudan University,Shanghai,200433,P.R.China) 1 (The 8~(th) Institute of Shanghai Academy of Aerospace Technology,Shanghai,200233,P.R.China) 2

【机构】 复旦大学力学与工程科学系； 上海航天技术研究院第八设计部；

【摘要】 针对热环境下薄壁细长旋成体模态的有限元分析问题,结合具体实例讨论温度对此类结构刚度矩阵的影响,并从理论上加以阐述说明。由温度应力引起的初始应力刚度矩阵对薄壁细长旋成体结构的自由弯曲模态影响较小,可以采用仅计及温度对材料性能影响的四边形单元模型进行模态分析,其结果偏差也在可接受范围之内。更多还原

【Abstract】 The normal modal of the slender spinning axisymmetric body of thin shell in the thermal environment is analyzed by finite element method.A case study is investigated to reveal the temperature effect to the stiffness matrix of this kind of structure.The theoretical analysis is conducted to explain the temperature effect on the beading modal of these structures.It is concluded that the contribution of the differential stiffness matrix induced by the thermal stress to the bending modal of the slender spinning axisymmetric body is small and can be ignored. A finite element model compose of quadric elements of this kind of structure is used to compute the normal modal. The error of the result of the simplified model is small comparing to the 3D finite element model.更多还原