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为了对20cm口径离子推力器栅极组件开展结构性能模拟分析,通过材料力学分析方法对栅极组件进行结构等效处理并进行验证,利用ANSYS有限元软件得到推力器的模态分析结果和栅极组件的模态振型,并开展基频扫描试验验证模态分析结果的正确性,最后模拟了推力器在1600g冲击载荷作用时,栅极组件的应力分布和形变结果。结果显示:将栅极组件等效为拱高不变且无孔的结构后,屏栅等效弹性模量为20.79GPa,加速栅等效弹性模量为89.43GPa;栅极组件表面的螺栓预应力大约在20~33MPa范围之间;模态分析结果显示,大于320Hz的振动频率时,栅极组件会出现较大的结构变化;通过10~1000Hz的基频扫描试验得到推力器基频在168Hz,分析结果 (185.23Hz)相比误差约10%;1600g的冲击载荷作用下,栅极组件边缘处最大形变达到约0.27mm,且表面边缘处的应力相对中心处较大,更容易发生破裂。
In order to simulate the structural performance of the 20cm ion thruster gate assembly, the structural equivalent of the gate assembly was verified by the method of material mechanics analysis. The results of the modal analysis of the thruster were obtained by ANSYS finite element software. The modal vibration mode of the module was tested. The results of modal analysis were verified by the fundamental frequency sweep test. Finally, the stress distribution and deformation of the gate module under the impact load of 1600 g were simulated. The results show that the equivalent elastic modulus of the grid is 20.79GPa and the equivalent elastic modulus of the acceleration grid is 89.43GPa after the grid structure is equivalent to the structure with the same height and no hole. The bolt pre- The stress is about 20 ~ 33MPa range; modal analysis results show that greater than 320Hz vibration frequency, the gate assembly will appear larger structural changes; 10 ~ 1000Hz fundamental frequency sweep test obtained thruster base frequency at 168Hz , And the result is about 10% compared with the result of 185.23Hz. Under the impact load of 1600g, the maximum deformation at the edge of the gate assembly reaches about 0.27mm, and the stress at the edge of the surface is relatively larger and more prone to rupture.