多用途飞船返回舱虚拟振动试验研究

利用虚拟振动试验软件系统、多用途飞船返回舱的有限元模型和"神舟一号"返回舱的历史试验数据,对多用途飞船返回舱进行虚拟正弦和随机振动试验,考核了返回舱经受动力学环境的能力,研究发现设计方案在一阶共振区响应过大,存在较大的设计缺陷,经过多次迭代优化设计后的模型满足设计要求。研究结果为多用途飞船返回舱的设计和优化提供了依据。

Virtual vibration analysis and verification of the re-entry capsule for a multi-functional spaceship

The vibrations of a re-entry spacecraft capsule are investigated by using the virtual vibration software. Combining the finite element model of the capsule and the history experimental data acquired from Shenzhou-1, the virtual sinusoidal/random vibration experiments are carried out to test the capsule''s ability of surviving the vibration environment during the launch stage. This analysis provides reliable and significant data for the optimized design of the capsule since the real vibration tests will not be carried out in the design stage. The model 1, which is before optimization, is found to have defects and the resonant response of the nodes in the Dadi region is too large to satisfy the experimental requirements. After the iterative optimization, the mode finally satisfies the design requirements. To reduce the cost and save time, instead of the real vibration test, the virtual vibration tests are beneficial. This is the first spacecraft designed based only on the virtual vibration in China.