Multi-Objective Optimization Design of Four-Gap Planar Connecting Rod with Low Consumption and Stability
In order to improve the efficiency of optimization design and more in line with engineering prac-tice,a set of quantifiable optimization design and evaluation system for low-consumption and stable planar linkage mechanism is proposed.Firstly,from the perspective of low-consumption and stability in the motion process,based on the theoretical model of planar linkage with friction pairs,an optimization model of four-linkage with low-consumption and stability is established.Then,based on the genetic algorithm,the pareto solutions of crank moment,peak force at hinge point and rocker angular acceleration are obtained.Finally,the theoretical model of planar linkage with four clearances and the Runge-Kutta method are used to solve the dynamics of five groups of solutions and compare the selection.The results show that,under the design requirements,compared with the scheme 5 with balanced objectives,the driving torque of the scheme 1 in-creases by 0.63％,the rocker angular acceleration decreases by 0.41％,and the forces at each hinge point decrease by 2.94％,11.92％,12.92％,and 12.04％,which can not only be low and smooth,but also help reduce wear.The system can effectively reduce the optimization time and the gap between the traditional theoretical model and the actual situation.
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