| The large engineering machinery in the actual production plays more and more important role. In this dissertation, a 12 bars hydraulic excavator with 3 degrees of freedom is presented. Kinematic analysis and optimum design of the working device are studied. All these provide theoretical basises for the further research of the mechanism.First of all, three-dimensional model of the shovel hydraulic excavator is accomplished by designing software. The main working parameters of the working device are analyzed based on the D-H method. The ADAMS software is carried out to solve the model of its kinematics after the appropriate constraints and the driving function are added. The main working parameters and mining area envelope diagram are gained. By comparing the simulation value with the theoretical analysis value, the correctness of the theoretical analysis is verified.Secondly, the optimization design of the working device of the hydraulic excavator is accomplished based on the MATLAB genetic algorithm toolbox in which the position parameter of the hinge point of the working device is the design variable and driving force is the optimization objective function. After several generations of inheritance, the optimized design variables are obtained.Finally, according to the optimized hinge point position parameters, three-dimensional model of the shovel hydraulic excavator is accomplished by designing software. Kinematic analysis of the working device is constructed based on simulation analysis software ADAMS. The mining area and its main working parameters are obtained after the optimization of the working device. The bucket rod separate mining conditions and driving force are analyzed based on the MATLAB software. The optimization of the hydraulic cylinder is required to provide less driving force than ever after the analysis and comparison of graphics and data are accomplished. All these prove that the performance of the excavator is improved after optimization.
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