空间冷热环境下航天器梁、板结构的参数辨识与模型修正研究

Hot and cold space environments have a great influence on the spacecraft structures, could lead to significant temperature gradients on the surface or even in the interior of the structure, not only resulting in uneven distribution of thermal stress, but also to change the mechanical properties and boundary conditions of the structure, also may cause thermally induced vibration or thermal buckling. From the time varying characteristics of the beam and plate structures of spacecraft in the hot and cold space environment, this project studies some of the dynamic behavior and model correction method for linear, nonlinear thermo-elastic structure. Surrounding the influence mechanism of the beam and plate structure of the spacecraft in hot and cold space environment, the dynamical modeling and modal parameter identification for beam and plate structures in the temperature varying environment, the model updating of thermo-elastic structure with temperature-dependent material, the experimental studies on the dynamical characteristics and model updating of thin plate structure and the nonlinear dynamical characteristics analysis of beam and plate structures are studied, to establish the scientific basis for the precision dynamical modeling for the typical spacecraft structures under hot and cold space environments.

空间冷热环境对航天器结构有很大影响，可能导致结构表面甚至内部出现大温度梯度环境，不仅造成不均匀的热应力分布，还会改变材料的力学性能和结构的边界条件，还可能引起结构发生热致振动或者热屈曲。本课题从空间冷热环境下航天器梁、板结构的时变特性出发，研究线性、非线性体制下热弹性结构的一些动力学行为与模型修正方法。围绕空间冷热环境对航天器梁、板结构的影响机理，开展时变温度环境下梁板结构的动力学建模分析与模态参数识别、温变材料属性梁板结构的模型修正、热弹性薄板动力学特性及模型修正的实验研究、空间交变热环境下梁板结构非线性动力学特性分析等研究，为空间冷热环境下航天器典型结构的动力学精细建模奠定科学基础。

空间冷热环境对航天器结构有很大影响，可能导致结构表面甚至内部出现大温度梯度环境.，不仅造成不均匀的热应力分布，还会改变材料的力学性能和结构的边界条件，还可能引起结构发生热致振动或者热屈曲。本项目从空间冷热环境下航天器梁、板结构的时变特性出发，研究了线性、非线性体制下热弹性结构的一些动力学行为与模型修正方法。围绕空间冷热环境对航天器梁、板结构的影响机理，开展了时变温度环境下梁板结构的动力学建模分析与模态参数识别、温变材料属性梁板结构的模型修正、热弹性薄板动力学特性及模型修正的实验研究、空间交变热环境下梁板结构非线性动力学特性分析等研究，为空间冷热环境下航天器典型结构的动力学精细建模奠定了科学基础。