某TMA遥感器桁架支撑结构动态特性研究
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摘要
空间遥感器中,支撑结构是保证光学元件结构位置精度及成像质量的关键。为了提高支撑结构的设计性能,确保结构的稳定性,利用CAE技术考核动态特性是遥感器研制过程中的一个重要环节。利用有限元平台,运用大质量法,建立了某TMA遥感器桁架支撑结构的动力学模型,进行了动态特性的仿真分析。依据动态特性仿真结果,发现了支撑结构中的薄弱环节,并进行了优化设计。仿真分析结果表明,优化后的遥感器桁架支撑结构固有频率明显提高,第一阶固有频率达到122.1Hz,保证了遥感器桁架支撑结构在外界动态载荷作用下的动力学响应。
In order to get high positional accuracy and imaging quality of optical elements,the design of support structure is very important in space remote sensor. And in order to improve the structure design of support structure,it is very important to qualify for the dynamic characteristics in the design process. Based on finite element method,the dynamics model of the space remote sensor with TMA optical system has been established by using great mass method,then the dynamic characteristics of support structure were worked out. According to the result of analysis,the weakness of the structure was found and improved. The result of analysis indicated that the natural frequency of the improved structure has been increased greatly,Model 1 reached 122.1Hz,which guaranteed the dynamic response of the support structure under the condition of low frequency vibration.
In order to get high positional accuracy and imaging quality of optical elements,the design of support structure is very important in space remote sensor. And in order to improve the structure design of support structure,it is very important to qualify for the dynamic characteristics in the design process. Based on finite element method,the dynamics model of the space remote sensor with TMA optical system has been established by using great mass method,then the dynamic characteristics of support structure were worked out. According to the result of analysis,the weakness of the structure was found and improved. The result of analysis indicated that the natural frequency of the improved structure has been increased greatly,Model 1 reached 122.1Hz,which guaranteed the dynamic response of the support structure under the condition of low frequency vibration.
引文
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[3]王有智,夏卫华.用大质量法计算东风EQ140汽车前面罩的强迫运动响应[J].力学与实践,2007,28(2):32-34.
[4]谢开仲,等.大跨度CFST拱桥行波效应的地震反应分析[J].桂林工学院学报,2005,25(4):455-459.
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[9]范钦珊,殷雅俊.材料力学[M].北京:清华大学出版社,2004.
[2]卢威,傅丹鹰,陶家生.基于有限元法的离轴TMA结构选型分析[J].航天返回与遥感,1998,6(6):34-38.
[3]王有智,夏卫华.用大质量法计算东风EQ140汽车前面罩的强迫运动响应[J].力学与实践,2007,28(2):32-34.
[4]谢开仲,等.大跨度CFST拱桥行波效应的地震反应分析[J].桂林工学院学报,2005,25(4):455-459.
[5]李延伟.大口径主反射镜轻量化结构拓扑优化设计[D].中国科学院长春光学精密机械与物理研究所,2008.
[6]林再文,等.碳纤维增强复合材料在空间光学结构中的应用[J].光学精密工程,2007,15(8):1181-1185.
[7]刘磊.空间光学遥感器轻型支撑结构研究[D].中国科学院长春光学精密机械与物理研究所,2006.
[8]耿麒先,杨洪波.空间遥感器动态特性研究[J].电子器件,2007,30(5):1638-1640.
[9]范钦珊,殷雅俊.材料力学[M].北京:清华大学出版社,2004.
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