热冲击载荷诱发空间结构振动分析方法研究

摘要

空间站在轨运行期间会周期性的受到太阳辐射、地球反照等，在热载荷作用下可能会诱发空间站结构的振动。通过研究热载荷诱发振动的机理，提出了一种计算非耦合热诱发振动的有限元分析方法，以传热学、弹性力学、动力学的基本理论为依据，按照节点位移等效原则计算有限元模型各节点的等效温度载荷，并以载荷作为激励研究结构的振动。根据结构的一阶固有频率，使用不同频率的热冲击载荷验证了热诱发振动分析方法的可行性。通过与经典理论和其他学者的分析结果作对比，验证了上述分析方法的精确性。使用Python前后处理程序可以高效地执行载荷读取、模型加载等操作，可以提高复杂模型的前后处理效率。该热诱发振动分析方法和Python前后处理程序可以高效地完成复杂空间结构的非耦合热诱发振动分析。%Structures of space station maybe vibrate induced by the thermal loads from the sun and the earth dur-ing running on orbit. By studying the theory of thermally induced vibration ( UTIV) , a finite analysis method of un-coupled thermally induced vibration was proposed. Based on the basic theories of heat transfer, elasticity and dynam-ics, equivalent temperature loads of nodes were calculated according to equivalent displacement principle of nodes and used to study the vibration of a structure as excitation loads. Three thermal shock loads with different frequencies were used to test the feasibility of UTIV analysis method considering the first order natural frequency. Comparative studies were carried out to prove the accuracy of this method. Pre- and post-processing Python programs were used to read load data and create loads on finite model, they can also complete pre-and post-process for complex model high effi-ciently. This UTIV method and Python programs can complete UTIV analysis of complex spacial structures high effi-ciently.