光学小卫星振动夹具设计及动特性分析
Design and analysis of dynamic characteristics of the optical satellite vibration fixture
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摘要: 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.Abstract: As the power transmission components of the vibration test of the satellite, the stand or fall of fixture performance directly affect the authenticity and reliability of the vibration test. The general design method of satellite vibration fixture was summarized, and a vibration fixture design work for a certain satellite was done very well. The dynamic characteristics of vibration fixture, such as the stiffness, quality and the natural frequency and dynamic response, were studied by using the finite element software MSC. NASTRAN. The analysis results shows that mean deviation of the dynamic characteristic response is about 6%, the maximum response deviation is about 11%. It is a reasonable range that the vibration fixture impact on the entire satellite dynamic characteristics. Now the vibration fixture has been successfully applied to the ground mechanics environmental test of a certain satellite which according to the mechanics experiment environment standard of GJB1032-90, and the expected results has been achieved. The method can also been applied to other satellite vibration fixture design process.