星载ATP二维转台抗力学环境设计

Design of Space-borne Two-dimensional Turntable of ATP Against the Environment of Force and Vibration

为了使某星载二维光电转台满足飞行平台对载荷动力学性能的要求,首先,对二维转台及其光学负载试验件进行力学摸底试验,找到初期结构抗力学环境性能的缺陷和不足。其次,通过对振动控制理论和轴系支撑刚度理论的分析、总结,指出了二维转台抗力学设计的关键,并为优化设计指明了方法和途径。最后,对二维转台支撑轴系和负载特性进行了详细地优化设计,并对改进后的新结构再次进行全面的力学环境试验。试验结果表明:二维转台的一阶固有频率得到大幅度提高,由之前的60 Hz提高到了90 Hz;沿平台发射方向的共振频率也由70 Hz提高到110 Hz,完全使载荷与平台的振动解耦;并且系统振动响应的非线性也得到了有效的改善。所以,优化设计后二维转台系统的动力学特性从根本上得到了改善,并能够通过航天鉴定级力学环境试验的考核。

One space-borne two-dimensional turntable in order to meet the requirements of mechanical property which the flying platform request.First of all,test component of two-dimensional turntable and its optical load are fabricated,then carry out baseline vibration test,in order to find the defect and shortage of the initial structure against the vibration environment.Secondly,through analysis and summarize the theory of vibration control and shaft support stiffness,the key point of two-dimensional turntable design to face the vibration is find out and indicated the method and way to the optimization design.Finally,the two-dimensional turntable bearing system and load characteristics in detail are redesigned.Then the comprehensive vibration environmental test is carry on to the new improved structure.The test results show that：first-order natural frequency of the two-dimensional turntable was increased greatly,which improve from 60 Hz to 90 Hz.In the direction of platform transmission,the frequency increased to 110 Hz from 70 Hz.So the payload and the platform achieve vibration decoupling completely.In the meantime,nonlinear vibration response of the system is also effectively improved.Therefore,the optimization design of two-dimensional turntable system dynamics characteristics improved fundamentally,and to be able pass the space identification level vibration environmental test evaluation.