1、 中文 2450 字 作者： Chunhui Yang Shimin Luo 国籍： China 出处： 2010 Intemational Conference on System,Engineering Drdign and Manufacturing Informatization Circular are flexible hinge stiffness character analysis Abstract-Flexible hinges are widely used in micro robotic. Its tigidity directly influences an org
2、anizations terminal localization. Its actual structure geometry size cannot satisfy the theoretical analysis completely in a theoretical supposition condition. In this paper. We analayzed the rotation rigidity of a ellliptical flexible hinge in different parameters using finite element software ANSY
3、S. The errors are discovered and compared with theoretical result. Though the graph of the flexible hinge parameters on the performance of a elliptical flexible hinge was carried out. The key manufacture parameters that affect the performance of an elliptical flexible hinge the most and rules of des
4、ign are given, which can provide directions of design precision for the flexible hinge. Keywords-flexible hinge； elllipse； finite element analysisl；rigidity .INTRODUCTION Flexible hinge have some characteristics, such as small volume, without tubs, ceaseless, good rigidity and high sensitivity. With
5、 micocomputer electrical system series (MEMS) technical rapidly expanding, flexible hinge are widely applied in the displacement which requests small angular and high-precision rotation, such as gyroscopes,accelerometers, percision instruments and so on. It has broad application prospects in the mic
6、ron level domain. The common flexible hinge is in two kinds:beam-shape flexible hinge and arc-shaped flexible hinge. The beam-shaped flexible hinge has a big slewing area, but the movement precision is bad. The arc-shaped flexible hinges movement percision is bad. The arc-shaped flexible hinge is re
7、latively small. In order to take into account the movement ptecision and scope, the following several rotation flexible hinges have been generated: parabolic flexure hinge, an elliptical flexure hinge and a hyperbola-shaped hinge, etc. The properties of flexible hinges are rigidity precision and str
8、ess characteristic etc. the rigidity performance reflects the stress ability and also manifests movement to a vice-flexible degree. In 1965, Parosetal announced his design development of the circular flexible hinge for the first time, and gave the rigidity formula.Smithetal used the similar method t
9、o obtain an elliptic flexible hinge mechanics expression. Nicolae Lodonitu inferred the parabola and the hyperbolic flexible hinges rigidity formula. Wei Xu and Tim king analyzed the tectangular and elllipse flexible hinges rigidity and rotarion precision using the finite element method. In this pap
10、er the elliptical flexible hinge stiffness to different geometrical parameters is analyzed with software ANSYs10.0. Compared with ressults of theoretical analysis and finite element analysis(FEA), the errors are analyzed. Theough the graph of the flexible hinge parameters and its performanve, an ana
11、lysis of changes of parameters on the performance of the elliptical fexible hinge was carried out. The key manufacture parameters that affect the performances of an elliptical flexible hinge the most and rules of design are given, which can guve direcrions of design precision for the flexible hinge.
12、 .RIGIDITY FORMULA OF THE ELLIPTICAL FLEXIBLE HINGE An elliptical flexible hing,as shown in Figure 1, is a particular type of flexure that consists of a neckde down section. Parameters t,h,b are flexible hinges smallest thickness,height and width ,resoectively, Parameter x is the semimajor axis of e
13、llipse, and y is the semimajor axis of elllipse. As shown in Figure 1(a), the infinitesimal is intercepted in the abscissa axis. To begin, the infinitesimal section is vertical to the abscissa axis. The flexible hinges angular deformation z is generated under torque zM as given in Equation(1). datE
14、b aaMdxxEIxMyyxzaazzxz 22 33c o s22c o s12（ 1） )12()14()1416(214a r c ta n)14()12(12c o s22c o s223422 3 sssssssssdatfy（ 2） Wheretas y The rotation rigidity fotmula is given by Euation(3) 1312 faEbaKxy (3) When yx , the flexible hinge is the circular flexible hinge. Its rotantion rigidity formula is given by Equatuin(4) fEbaK 122 (4) The rorarion rigidity formula of circular flexible hinge is consistent with the reference2. (a) (b) Figure 1 Model of elliptical flexible hinge . FEA MODEL OF ELLIPTOCAL FLEXIBLE HINGE
