摘要: |
国内太阳翼预紧力绝大多数由压紧释放装置中的压紧杆提供,在卫星发射阶段,当太阳翼压紧杆的预紧力不足时,太阳翼与卫星本体会出现耦合现象,对太阳翼的结构特性和在轨展开产生一定的影响。文章提出采用有限元仿真计算与振动试验相结合的方式对太阳翼压紧杆的预紧力进行研究,针对某型号太阳翼完成了振动试验。试验结果表明:压紧杆预紧力由3000N递减到1000N时,太阳翼一阶频率减小约7Hz,同时太阳翼的最大响应值增大约0.5g,最大响应值较输入值X方向放大约20倍,Y方向放大约7倍,Z方向放大约17倍。因此,振动试验获知的数据可以更准确反映太阳翼压紧杆预紧力对其结构特性的影响。 |
关键词: 太阳翼;压紧杆;预紧力;模态分析;振动试验 |
基金项目:陕西省自然科学基础研究计划(天地一体化信息网络) |
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The Effects of Pre-tightening Force of Compression Bar for Structural Characteristics of Solar Array Wing |
Zhang Yanna1,2
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1. The 39th Research Institute of China Electronics Technology Group Corporation, Xi’an 710065;2. Key Laboratory of Atenna and Control Technology of Shanxi Province, Xi’an 710065
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Abstract: |
The bonding strength of electroformed nickel/zirconium copper at high temperature or after thermal cycle was measured by tensile test. Fracture surface morphology and microstructure after high temperature or thermal cycle were observed by scanning electron microscope. Results show that recrystallization of electroformed nickel and electroformed copper occurs after high temperature preservation, and grains transform from columnar along the electroforming direction to equiaxed while the microstructure was homogenized. The grain size of electroformed copper grows rapidly as temperature increases. With the increase of tensile temperature, the bonding strength of electroformed nickel/zirconium copper decreases, and the transgranular fracture changes to intergranular one. The room temperature bonding strength after thermal cycle increased slightly when the maximum temperature was below or equal to 400℃. Bonding strength decreased slightly when the maximum temperature was above or equal to 500℃. |
Key words: solar wing; compression bar;pre-tightening force;modal analysis;vibration test |