摘要
针对直梁型柔性铰链转动存在寄生位移难以实现微机电系统机构高精度运动应用,基于直梁圆角型柔性铰链,提出含平面对称孔隙或偏置孔隙结构、具有局部泊松比特征的新型柔性铰链。结合柔性铰链闭环柔度方程构造对标柔性铰链有限元计算模型;对具有相同孔隙率但不同组合形式孔隙的柔性铰链进行旋转柔度、回转精度及模态分析。结果表明,相同孔隙率下,对称布置孔隙铰链的柔度、中心回转精度均高于偏置孔隙铰链,其中3×3对称布置孔隙结构可将铰链自由端挠度提升20%,中心回转精度提高11.97%;孔隙结构柔性铰链自由端载荷与该端位移呈近似线性关系。本研究为多孔异构形式新型柔性铰链在特定精度与受多向力场合应用提供新思路。
Due to the parasitic displacement of the straight beam flexible hinge,it is difficult to get the high precision motion of the MEMS mechanism.A novel flexible hinge with plane symmetrical and offset porous characteristics is presented.The finite element calculation model for flexible hinge is established,and its feasibility and correctness is checked with the closed-form compliance equation.Compliance,precision and modal analysis of flexible hinges of same porosity but different combination are calculated.The results show that the porous structure enhances the compliance of hinges.With the same porosity,the compliance and rotation precision of the symmetrical pore characteristics hinge are higher than that of the offset pore hinge,and the 3×3 symmetric arrangement of the porous structure can improve the deflection of the hinge free end by 20%,the center rotation precision is improved by 11.97%.The relationship between the free-end load-displacement of the flexible hinge and the porous structure is approximately linear.Those results provides a new idea for applying the porous hinges to the specific precision,large rotation angle and multi-direction forces.
作者
王明远
杭鲁滨
黄晓波
白乐乐
汪千升
Wang Mingyuan;Hang Lubin;Huang Xiaobo;Bai Lele;Wang Qiansheng(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《机械科学与技术》
CSCD
北大核心
2020年第1期102-108,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51475050)
上海汽车工业科技发展基金会项目(1617)
上海工程技术大学基金项目(18KY0111)资助.
关键词
柔性铰链
孔隙结构
柔度
回转精度
有限元分析
flexible hinge
porous structure
compliance
rotation precision
finite element simulation
