Development Of Modeling And Analysis Software Of Compliant Mechanisms Based On Chained Beam Constraint Model

Compliant mechanisms achieve transduction and conversion between movement,force,and energy through non-linear elastic deformation of the compliant components.Compared with traditional rigid-body mechanisms,compliant mechanisms have the advantages of high precision,frictionless and simple assembly.Planar compliant beam is an important component of the compliant mechanism.It is simple in structure and can provide a wide range of motion.Therefore,it is widely used in the fields of precision instrument and medical bionics.The Chained Beam-Constraint-Model is a very mature algorithm for calculating the nonlinear deformation of planar compliant beams.In order to facilitate flexure hinge mechanism designers to discuss and brain-storm,this study has developed an Android application(APP)for rapid modeling and analysis in planar compliant mechanisms used in Android smart phones.In this paper,the main research work is as follows:(1)On the basis of the basic particle swarm optimization algorithm,the influence factors of the particle with the optimal global velocity are integrated into the velocity updating formula of the particle,and an improved particle swarm optimization algorithm is proposed.The accuracy of this algorithm is verified by several typical functions.Then,this particle swarm optimization algorithm is used to optimize the objective function to solve the nonlinear equations and provide technical support for the software solution module.(2)The preliminary demand analysis and design of MASCM are completed.The software development language and development platform are identified.The demand analysis of MASMC is carried out from two aspects of function and performance.Under the guidance of software requirements,the software structure and the function module of MASCM is determined.This paper analyzes the constraint relationship between mechanism and provides a theoretical basis for the determination of the topological relationship of the mechanism in MASCM.(3)Planar compliant mechanism modeling and analysis APP(MASCM)modules are implemented on the Android platform.The software user interface model is available for users to quickly draw the simplified model of the planar compliant mechanism;drawing module defines the drawing system and provides the drawing function;parameters input module is used to define each component parameters of mechanism;digitalization module can transform and storage information of mechanism;mathematical modeling module is based on CBCM,and combines the parameters of the unit in the mechanism to obtain the mechanism's geometric nonlinear equations;the model solution module is used to solve nonlinear equations based on VEPSO;the post-processing module can display the motion of the mechanism in real time and show the force-displacement curve and data of the mechanism,et al.(4)The operation flow of MASCM for the modeling and analysis of the planar compliant mechanism are introduced through several classic planar compliant mechanisms,such as partial compliant four-bar mechanism,circular-guide compliant mechanism and cross-axis flexural pivot,et al.The results of the analysis are compared with the results obtained in other ways.By building an experimental platform of a partial compliant four-bar mechanism,the MASCM analysis is verified,which means that MASCM's analysis have reference value to the designers.Finally,through the unit testing of MASCM through Junit,the quality of MASCM software is guaranteed.