一种新型空间微操作平台的设计和性能

发布时间：2018-08-23 14:45

【摘要】：设计一种新型的6自由度精密微动平台,并对其静态和动态性能进行分析。利用3对不同方位的柔性铰链设计一种能实现6自由度运动的柔性运动支链,且支链结构设计在同一平面,将2对支链对称放置形成结构紧凑和高强度的微动平台。采用有限元软件ANSYS对平台进行柔度和运动学分析,分析结果表明对称支链1和3能产生Z和Y方向平动和绕X和Y的转动,而对称支链2和4能产生X和Y方向平动和绕Z和Y的转动,所以平台能实现6自由度运动,2对对称支链可以实现运动互补且具有部分运动解耦性。对平台进行灵敏度分析表明输出位移与输入位移为线性关系,平台沿X和Z方向的位移灵敏度相同,绕X和Z方向转角灵敏度相近,但Y方向灵敏度较小,说明平台在Y方向上运动性能不如其他方向的。对平台进行模态分析,从振型可看出其可实现6自由度方向的运动,并分析了在有和无预应力两种情况下的固有频率,两者差值范围为16.8%~33.9%,说明预应力对平台的固有频率有较大影响。
[Abstract]:A new 6 DOF precision fretting platform is designed and its static and dynamic performance is analyzed. Using 3 pairs of flexible hinges with different azimuth, a flexible motion chain with 6 degrees of freedom is designed, and the structure of the branch chain is designed in the same plane, and two pairs of branches are symmetrically placed to form a compact and high strength micro-moving platform. The finite element software ANSYS is used to analyze the flexibility and kinematics of the platform. The results show that symmetric branching chains 1 and 3 can produce Z and Y directions translation and rotation around X and Y. The symmetrical branching chain 2 and 4 can produce X and Y directions translation and rotation around Z and Y, so the platform can realize 6-DOF motion and can realize the complementary motion and partial kinematic decoupling of the symmetric branched chain. The sensitivity analysis of the platform shows that the output displacement is linear with the input displacement. The displacement sensitivity of the platform along X and Z directions is the same, and the sensitivity of rotation angle around X and Z directions is similar, but the sensitivity of Y direction is relatively small. It shows that the motion performance of the platform in Y direction is not as good as that in other directions. The modal analysis of the platform shows that it can realize the motion in the direction of 6 degrees of freedom, and the natural frequency of the platform with and without prestress is analyzed. The difference between them is 16.8and 33.9. it shows that the prestress has great influence on the natural frequency of the platform.
【作者单位】：江西理工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51265016) 江西省教育厅科技项目(GJJ12358) 江西省科学基金资助项目(20122BAB216029) 江西理工大学科研基金资助项目(jxxj12050)
【分类号】：TH703

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