Configuration Design And Static Stiffness Analysis Of A Dualboard Skiing Simulation Platform

The successful bid for the Beijing Winter Olympic Games has made snow sports rapidly popular in China.However,the development of ice and snow projects in China is late,and the cost of skiing and the risk of injury are high,which makes it impossible to popularize in China.Therefore,a double-board skiing simulation platform is proposed,which can simulate the pitch,deflection and braking during the double-board skiing process to meet the needs of simulated skiing.The main contents of this paper are as follows :Firstly,the configuration design of the double-board simulated ski platform is carried out.By analyzing the action of double-board skiing,the degree of freedom and range of motion are obtained,and the hybrid mechanism is formed by series-parallel superposition to meet the design requirements.The configuration design of the hybrid mechanism is carried out by using the atlas method and the screw theory.The parallel mechanism satisfies the main motion form,and the series mechanism complements the degree of freedom.Finally,the corresponding hybrid mechanism can be obtained through the degree of freedom configuration,configuration design and superposition series mechanism of the parallel mechanism.Secondly,the kinematics analysis of the hybrid simulated skiing mechanism was conducted in this study.The analysis was divided into two parts: the kinematics analysis of the series mechanism and the kinematics analysis of the parallel mechanism.By employing the principles of screw theory,the degree of freedom,forward and inverse solutions of the motion,velocity Jacobian matrix,and workspace of the mechanism were determined.The workspace was visualized using Matlab.Then,the static analysis of the parallel mechanism is carried out by using the vector method,and the static stiffness characteristics of the mechanism are analyzed based on the principle of virtual work.By applying external loads to the force point of the parallel mechanism,the restraining force and moment of the branch chain on the upper platform are calculated,and the static model of the parallel mechanism is established.By splitting the branch chain of the parallel mechanism,the force of each kinematic pair in the branch chain is obtained.On this basis,the Solid Works 3D model of the mechanism is drawn,and it is imported into Adams for simulation analysis,and the force curves of each kinematic pair under external loads are obtained,and compared with the theoretical results to prove its accuracy.Under the action of external load,the end of the upper platform of the parallel mechanism deforms.This deformation has six dimensions along the three coordinate directions,and can be decomposed into the axial deformation of the branch chain.The static stiffness model of the branch chain is obtained by linearly superimposing the stiffness of each component of the branch chain,and then the static stiffness model of the whole mechanism is obtained by applying the principle of deformation superposition.Finally,the finite element analysis of the single-foot pedal platform was completed,and the weak points of the structural part were obtained,and the size optimization and structural design were carried out for the weak parts of the rigidity,and on this basis,the appropriate driving parts and materials were selected,and finally built a hybrid ski simulation platform that meets the safety and design requirements.