太阳翼铰链结构的动力学实验与非线性动力学建模

Dynamic Experiments and Nonlinear Dynamics Modeling of Joints in Solar Array

通过动力学实验获得真实的太阳翼板间铰链结构于不同激振频率下的振动响应参数,并采用力状态映射法建立板间铰链的非线性动力学模型。首先,采用单频激励信号模拟外扰对实际的板间铰链结构实施动力学实验;然后,基于其结构具有的多重非线性动力学特性,根据实验数据应用力状态映射法辨识结构的动力学参数,建立其非线性动力学模型;最后,对由太阳翼板间铰链连接的两段梁所构成的系统进行了冲击激励下的振动响应测试,同时进行了有限元动力学仿真,实验测试结果和数值仿真结果取得了较好的一致性。本文建立的太阳翼板间铰链非线性动力学模型能够较好地反映其动力学特性,对于实际太阳翼结构的动力学建模具有理论参考价值。

The vibration response parameters of the actual joint structure in a solar array at different excitation frequencies are obtained by using dynamics experiments, and the nonlinear dynamics model of the joint is established by using the force-state mapping method. First, the single frequency excitation signals are adopted to simulate the external disturbances to carry out the dynamics experiments for the actual joint in a solar array. Then, based on the multiple nonlinear dynamics characters of the joint, the dynamics parameters of the joint are identified by using the force-state mapping method according to experimental data, and its nonlinear dynamics model is established. Finally, the vibration response test under the impact excitation is conducted for a system of two beams connected by the joint, and the finite element dynamics simulation of it is carried out. The test results agree well with the simulation results. The established nonlinear dynamics model of the joint in solar array can well describe its dynamics characters, and is good value for the theoretical reference of the dynamics modeling of actual solar arrays.