摘要
为了使TMT三镜系统具有跟踪瞄准功能,同时可以校正由于重力引起的结构变形,设计一个大型的Stewart平台来完成三镜的Tilt调整。根据初始参数对并联机构进行了位置反解的计算,并分别对支腿轴向力和刚度进行了建模,最后使用了Matlab进行优化计算,得出一组最优解。根据所求出的最优解使用ANSYS建立了三镜系统的参数化模型,并与Matlab联合仿真,对三镜系统的各个工况进行了有限元模拟。仿真得到三镜各个工作位置时的支腿的伸长量、重力下的变形、第一阶模态值以及六根支腿内力。模拟结果显示,最终设计的Stewart平台支腿的最大变形量为0.813 mm,与优化前的模型相比下降了20%;第一阶模态最小值为16.7 Hz,与优化前的模型相比上升了18%;六根支腿的轴向力最大值为27 219 N,相比优化前下降了15.9%。
A huge Stewart platform to implement the Tilt adjustment, which makes the TMT＇s M3S process the capability of pointing and tracking and corrects the deformation caused by the gravity. First, the inverse kinematic solution of Stewart platform was calculated with the initial parameters, and the model of stiffness and axis force were constructed in each leg. Then an optimal solution was obtained by using the Matlab optimization toolbox. At last, a parametric model was constructed in ANSYS with the optimal solution, and simulated with Matlab software to gain the results needed. The results show that the optimal solution gains the advantage over the initial one. The maximum deformation is 0.813 mm, decreasing about 20% compared with the initial one. The minimum of the first modal is up to 16.7 Hz, promoting 18%. In addition, the maximum axis force in each leg descends to 27 219N, decreasing about 15.9%.
出处
《红外与激光工程》
EI
CSCD
北大核心
2012年第12期3336-3341,共6页
Infrared and Laser Engineering
基金
中国科学院长春光学精密机械与物理研究所三期创新工程专项基金
