【摘要】 论文对辐射换热条件下闭口薄壁杆件与单枝开口薄壁杆件的瞬态温度场问题,提出了一种一维傅立叶温度有限元,克服了传统一维温度单元只能计算薄壁杆截面平均温度的缺点,通过增加结点摄动温度自由度的方法,该一维单元能计算杆截面的温度分布.在此一维温度单元与梁位移单元相协调的基础上,进一步发展了大型空间结构热诱发振动稳定性判据与热颤振响应有限元计算方法.对于柔性空间结构发展了考虑几何非线性的热-结构动力学耦合有限元计算方法,成功地对这类结构的热动力屈曲问题进行了数值模拟.更多还原

【Abstract】 A kind of 1D-Fourier element for transient temperature-structural analysis of thin-walled beams with radiant thermal boundary is presented.The sections of thin-walled beam elements could be closed or open.Different from traditional 1D-temperature finite elements,some perturbation temperature freedoms are added at each node,so that not only the average temperature,but also the temperature distribution in the section can be analyzed with the present 1D-temperature finite element method.The stability conditions of the thermally induced vibration and the thermal flutter response of large space structures can be analyzed by this kind of finite element,which shares the same mesh in both the transient temperature analysis and the structural dynamic analysis.In addition,a thermal-dynamic coupling finite element method considering geometric nonlinearity is developed and thermal dynamic buckling behaviors are simulated numerically for large scale flexible space structures.更多还原