Dynamic Stiffness And Stiffness Model Analysis Of3-PRS Parallel Mechanisms

In recent years, with further increase global productivity able to adapt to morecomplex production environment and meet the needs of the more diverse marketinstitutions and the new multifunction systems has become the machinerymanufacturing industry competing to explore and research directions. At this timeparallel mechanism came into being. Relative to the serial mechanism, it is a new typeof organization. Its main advantage is its higher stiffness, higher accuracy and smallererrors, and these benefits just to meet the goal of modern machinery, which makes thewidely used parallel mechanism. Stiffness analysis and performance evaluation is animportant part in PKM structural design. How can I find rigidity analytical modelingand evaluation method is suitable for the needs of conceptual design, detailed designstudies to meet the needs of the whole stiffness fast and accurate finite elementmodeling and experimental methods in order to PKM designed to provide a moreaccurate stiffness analysis and performance evaluation model is placed in front of themachinery manufacturers a big challenge. This is also the main contents of this paper.In this paper,3-PRS parallel mechanism for the research mode. First of itskinematic analysis of this model has been compared Jacques matrix, through itsJacobian matrix stiffness matrix model to establish a tradition of this model.Finite element software ANSYS Workbench to3-PRS parallel mechanism hascarried on the comprehensive dynamic analysis. In modal analysis is obtained in itsnatural frequencies and mode shapes. Harmonic analysis obtained after its loadbearing frequency diagram. Transient kinetic analysis of this model is finally obtainedstiffness during exercise at different times and in different pose, that is, its dynamicstiffness. This method avoids the need for different bit-shaped finite element model toremesh and solver.Choose to have a greater impact on the3-PRS parallel mechanism platformradius, as well as the cross-sectional diameter of the rotating hinge lever to move therod side length of the study. Application of orthogonal experiment and the size of arepresentative data are combined to establish orthogonal. ANSYS Workbenchsoftware orthogonal dimensions apply in combination statics analysis and the staticstiffness. Application of the least squares method to the data in the final orthogonal fitting regression models get two stiffness and pick a best regression model.MINITAB software application stiffness model3-PRS parallel mechanism forauthentication and the best subset regression analysis, regression analysis, regressionanalysis and forward selection backward elimination regression analysis. Applicationof MATLAB software for single factor and double factors effect on the3-PRS parallelmechanism. Comprehensive validation analysis to provide a new direction for thefuture and the basis for the stiffness of parallel mechanisms.