Accuracy Analysis And Design Of A Novel 6-(P-2P-S) Parallel Robot

The thesis focuses on the accuracy research on a novel 6-(P-2P-S) orthogonal parallel robot, the robot is developed based on the Stewart platform mechanism.Its layout feature is presented according to the previous research results. The forward and reverse position are established by using spatial mechanisms. The paper also shows that the novel parallel robot is characterized by decoupling at its orthogonal position.Base on the architecture constraints, its workspace is investigated. The effects of the design parameters to the workspace volume are studied quantitatively.Kinematics transmission isotropy evaluation criteria is defined. The distribution of the defined evaluation criteria are presented on the workspace.To get the mapping relationship between the influencing factors and the end error of the 6-(P-2P-S) parallel robot, the kinematics equation are differentiated. The analytic expression of the geometric error of the 6-(P-2P-S) parallel robot is obtained by using the superposition theorem and comprehensively considering the influencing factor. The distribution on terminal platform errors is discussed using Monte-Carlo method. By comprehensively considering the two evaluation indicators: absolute error sensitivity and error isotropy sensitivity, the influence of the influencing factor effecting on the end effector is analyzed.Based on the workspace of a novel 6-(P-2P-S) parallel robot, geometry parameter of the parallel mechanism is optimized which depend on the glob kinematics and the glob equal errors.