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In ADAMS, the hinge point of the transmission mechanism was established, and the virtual prototyping model of the eight-bar linkage mechanism was established. The vertical and horizontal coordinates of each hinge point were parameterized as the design variables, and the more sensitive design variables were chosen as optimization variables by comparing the influence of each design variable on the standard deviation of the slider speed within the work stroke. Then, the minimum value of the standard deviation of the slider speed in the working stroke was regarded as the optimization target based on the existence of crank to establish restrictions. Furthermore, inequality constraints were turned to equality constraints by generalized reduced gradient and introducing the slack variable, and the objective function was changed into the expression with non-base variables by taking the non-base variables expressing the base variables. Finally, the optimal results were obtained by adjusting appropriately design variables. Compared with the pre-optimization mechanism, the maximum speed is decreased from 590 mm·s-1 to 425 mm·s-1, and the standard deviation of the speed is decreased from 175 mm·s-1 to 120 mm·s-1 within the work stroke.
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