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星载设备遭受的冲击振动环境恶劣,其结构和元器件极易出现由于过大的冲击而导致的结构破坏、功能失效等动力学问题。为了减小星载设备过大的冲击振动响应,提高其抗冲击安全性,本文基于结构有限元方法建立了某星载设备的结构动力学模型,运用大质量法进行了模态分析和冲击谱分析;基于模态分析和冲击谱分析的结果对结构的薄弱环节进行了改进设计。分析结果表明,结构改进设计后,以结构增重仅1.03%的微小代价使结构基频提高了14.7%,最大Mises应力响应降低了8.73%,满足了结构强度的要求,验证了修改方法的可行性。
Impact of the spaceborne equipment Vibrating environment is harsh, its structure and components are prone to kinetic problems such as structural failure and functional failure due to excessive impact. In order to reduce the overshoot vibration response of satellite-borne equipment and enhance its impact safety, the structural dynamics model of a spaceborne equipment is established based on the structural finite element method. The modal analysis and the shock spectrum Based on the results of modal analysis and shock spectrum analysis, the weak points of the structure were improved. The analysis results show that after the structural design is improved, the fundamental frequency of the structure is increased by 14.7% at a slight price of only 1.03% of the weight of the structure, and the maximum Mises stress response is reduced by 8.73%, which meets the requirements of the structural strength and verifies the feasibility of the modification method Sex.