风云四号卫星微振动抑制和试验技术研究

Research on micro-vibration control and testing of FY-4 meteorological satellite

风云四号搭载的干涉式大气垂直探测仪对微振动异常敏感,需要进行微振动抑制.结合星上主要振源和敏感载荷的需求,进行了振源和载荷二级微振动隔离.对隔振系统使用的隔振器单元进行了参数和敏感性分析,对设计的Stewart构型动量轮支架进行了理论和试验研究.采用隔振器和阻尼器的组合设计了三点支撑敏感载荷隔振系统,完成干涉式大气垂直探测仪的二级隔振设计,进一步抑制卫星平台传递至探测仪的微振动干扰.采用近零刚度悬吊系统和超静实验室完成了地面微振动试验,并进行了在轨微振动试验,实测数据表明,隔振系统能够使得卫星平台传递至载荷安装面的微振动量级控制在0.1 mg以下,满足了指标要求.风云四号微振动抑制技术也为相关型号的微振动抑制提供了借鉴和参考.

The spacecraft is developing towards ultra-high precision,ultra-high stability and hyper-spectral sensing directions. Micro-vibration in satellite platform can significant degrade the performance of payload,so that the micro-vibration analysis,control,measurement and experiment is very important to all kinds of high performance satellites.Considering the main vibration source on the FY-4 meteorological satellite and the requirement of the sensitive payload,the vibration suppression isolators are adopted to both vibration source and the sensitive payload.The parameters and sensitivity of the isolator unit are studied to give basic vibration suppression design guideline.Based on the isolator unit,the research on the hexapod vibration isolation chasis for flywheel is carried out theoritically and experimentally.For the sensitive payload vibration isolation,a three-point support using isolator and damper is proposed and the vibration isolation performance is studied.The vibration isolation of the interferometer can be seemed as second level isolation and can further reduce the vibration.The low-frequency suspension system and ultra-quiet laboratory are used to fulfill the micro- vibration experiment on ground.The on-orbit vibration measurement system is carried on FY-4 meteorological satellite and the real data show that the micro-vibration level can be suppressed to under 0.1mg which totally meets the design requirement.The micro-vibration suppression and experiment technique are of great significance and can also be used to other similar satellite.