六自由度机构弹性变形分析

iming at the problem that a wind tunnel capture trajectory test mechanism is subject to elastic deformation due to external load, which affects the motion accuracy of the mechanism, a combination of Solidworks and AnsysWorkbench is proposed to obtain the stiffness coefficient matrix of the mechanism in different poses. The RBF radial basis function is used to simulate Method of forecasting. The inverse solution of the kinematics of the mechanism is derived; an auxiliary steel plate is added at the end of the mechanism, and the joints of Solidworks and AnsysWorkbench are used to obtain the deformation of the four vertices of the auxiliary steel plate in three translational directions under external load. The average value is the deformation in the three translation directions of the center of the end surface of the mechanism. The simulation deformation data is processed by establishing a wind tunnel coordinate system, a rigid body fixed coordinate system, and a deformation coordinate system. The infinitely small rotation principle is used to obtain the end center of the mechanism. Deformation in three directions of rotation; the stiffness coefficient matrix of the mechanism is obtained from the theory of elastic deformation; and the RBF radial basis function is used to fit and predict the required stiffness. The stiffness coefficient matrix obtained through simulation is compared with the predicted stiffness coefficient matrix in the same pose. The error between the two is small, which meets the accuracy requirements.