Abstract: Aiming at the problems that the current co-simulation technology has a high degree of discretization and the optimization iteration process needed a lot of repetitive work. A distributed axial piston pump co-simulation method based on digital base technology was proposed. Based on the digital base technology, it could realize the template management of the co-simulation model, realize the zero-cost management of the design, and improve the design efficiency. Firstly, through the mechanism analysis of kinematics and dynamics of the rotor shafting of a large displacement axial piston pump, the definition method of the constraint relationship between the moving components was clarified. Then, the co-simulation model of the hydraulic system dynamics of the axial piston pump was constructed, and the kinematics and dynamics characteristics of the components in the pump were calculated. Thirdly, the results of co-simulation were analyzed, and the forcing and motion characteristics of the pump components in the rotation period were analyzed, and the weak part of the design of the piston was discussed by constructing a flexible boy. Finally, based on the digital base platform technology, the automatic optimization design template of the valve plate of the piston pump was built. By configuring the functional model interface, the data scheduling of the co-simulation model and the integration of multi-software design-simulation verification-optimization were realized, and the optimization strategy model of the damping groove structure with multi-objective genetic algorithm was constructed. The online optimization of the optimal configuration of the damping slot and the model self-updating were realized. The research results show that, comparing with the traditional discrete optimization design method, building an integrated design optimization platform can greatly improve the design efficiency, avoid the problem of repeated modeling of the valve plate structure in the traditional optimization design process, and a Pareto frontier judgment component is proposed to solve the optimal structural parameters to achieve automatic modeling of optimization results.
Key words:  digital base technology;axial piston pump; co-simulation; design platform; dynamics analysis; valve plate structure