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本文研究了柔性多体系统刚-柔-热耦合动力学特性。以哈勃天文望远镜(HST)为研究对象,基于柔性多体系统动力学理论,考虑了柔性附件弹性变形引起的热辐射边界条件的变化,建立了中心刚体和太阳能毯柔性附件多体系统的刚-柔-热耦合的动力学方程。通过对热载荷作用下哈勃天文望远镜多体系统的数值仿真研究了热辐射角、阻尼系数、比热容、支撑梁、太阳能毯之间的轴向力等参数对于柔性附件热颤振的影响;并提出增加结构阻尼、减小支撑梁和太阳能毯之间的轴向力、选择阻尼系数和比热容均较大的支撑梁材料、采用柔度较大的主体桶材料等改善热颤振的措施。
In this paper, the rigid-flexible-thermal coupling dynamics of flexible multibody system is studied. Taking the Hubble Space Telescope (HST) as the research object, based on the theory of flexible multibody system dynamics, the boundary conditions of heat radiation caused by the elastic deformation of the flexible attachment were considered. The stiffness of the center rigid body and the flexible attachment of solar panel The Dynamics of Soft - Thermal Coupling. The effects of parameters such as thermal radiation angle, damping coefficient, specific heat capacity, axial force between support beam and solar blanket on thermal chattering of flexible attachments were investigated by numerical simulation of Hubble telescope multi-body system under thermal load. Proposed to increase the structural damping, reduce the axial force between the support beam and the solar blanket, select the support beam material with large damping coefficient and specific heat capacity, and adopt the main barrel material with greater flexibility to improve the thermal chattering measures.