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夹具是卫星振动试验的传力部件,夹具性能的好坏直接影响到振动试验的真实性和可靠性。总结了卫星振动夹具设计的一般方法和思路,针对某光学小卫星振动夹具进行了设计工作,利用有限元软件MSC.NASTRAN对振动夹具动特性进行了分析,对其刚度、质量、固有频率及动特性响应间的关系进行了研究,完成了某光学小卫星振动夹具的设计工作,从其动特性响应分析结果看,带振动夹具后整星动特性响应平均偏差约为6%,最大响应偏差约为11%,振动夹具对整星动特性影响在合理范围内,目前该振动夹具已成功应用于某光学小卫星按GJB1032-90所规定的地面力学环境试验中,并取得了预期的效果,该方法可应用于其他卫星振动夹具的设计中。
Fixture is the force transmission component of the satellite vibration test, fixture performance directly affects the vibration test the authenticity and reliability. Summarized the general method and idea of satellite vibration fixture design, aiming at the design of an optical satellite vibration fixture, the dynamic characteristics of the vibration fixture were analyzed by finite element software MSC.NASTRAN. The stiffness, mass, natural frequency and dynamic The relationship between the characteristics of response was studied and the design work of an optical small satellite vibration fixture was completed. According to the dynamic response analysis results, the average response of the whole dynamic response with the vibration fixture is about 6%, and the maximum response deviation is about Is 11%. The influence of the vibration fixture on the whole-star moving characteristics is within a reasonable range. At present, the vibration fixture has been successfully applied to the ground mechanical environmental test specified by GJB1032-90 for an optical small satellite and has achieved the expected effect. The method can be applied to the design of other satellite vibration fixtures.