摘要
针对大型天文相机在旋转方向上出现的像旋现象,用无摩擦、无磨损、免润滑、易维护、分辨率高的柔性铰链轴系设计了一种快速微调机构,使其直接带动相机进行机械消旋.柔性轴系由八个倒圆角柔性单元均匀阵列分布组成,根据单个柔性单元的结构特性应用力学理论建立了该机构的理论模型,分析了刚度与结构参量的关系.进行了有限元仿真,并通过实验进行测试,结果表明:有限元仿真与理论分析最大误差为3.215%,实验测试结果与理论分析最大误差为4.875%,验证了理论公式准确可靠.通过理论公式建立数学模型,方便快捷地确定了该快速微调机构的最优结构参量,实现了满足技术要求并且工作力矩尽量小的设计目标.
Regarding the image rotation happened on the rotation direction of large astronomical cameras,a system of fast adjustment mechanism was designed with the flexible hinge shafting which was characterized by zero friction,non-abrasion,free of lubrication,easy maintenance and high resolution.This system could directly drive the camera for a mechanically despun.The flexible shafting was composed of 8flexible units which were rounded off and evenly distributed.According to the structure of each flexible unit,a theoretical model was also set up for the system guided by applied mechanics theories,by which we analyzed the relationship between the rigidity and the structural parameters,carried out the finite element simulation and made experiments for test.The results showed：The maxim error between the finite element simulation and the theoretical analysis was 3.215%.The maxim error between the testing result and the theoretical analysis was 4.875%.It verified that the theoretical formula is correct and reliable.The mathematical model was built up according to theoretical formula,so that we could define the optimized structural parameters efficiently for the fast adjustment mechanism,and realize the design goal to meet the technical requests and minimize the working moment.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2016年第6期55-61,共7页
Acta Photonica Sinica
基金
国家高新技术研究发展计划(No.2011AA12A103)
设备研发基金(No.08001SA050)资助~~
关键词
机械设计
像旋补偿
结构分析
柔性铰链
快速微调
数学模型
刚度
Machine design
Image spin compensation
Structure analysis
Flexible links
Fast adjustment
Mathematic models
Stiffness
