This paper focuses on the optimization and stiffness performance analysis of three kinds of three degrees of freedom (DOF) spatial and spherical parallel mechanisms. Firstly, the kinematic model and the Jacobian matrix for the 3-DOF parallel mechanisms are established and solved, and the objective functions for stiffness and workspace optimization are formed; secondly, by using stiffness and workspace as objective functions and applying different multi-objective optimization methods, the general procedure for the multi-objective optimization problem for the parallel mechanisms are established. Finally, the correspondence and the differences between several stiffness models are compared and illustrated.

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