1.Institute of Advanced Machines, Zhejiang University, Hangzhou 310014, China 2.State Key Laboratory of Fundamental Components of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310058, China 3.State Key Laboratory of Intelligent Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Because of the asymmetric structure of axial piston pump, its output pressure and output flow have pulsating characteristics, which affects the output stability and reliability of hydraulic system. Therefore, an optimization design method of low pulsation structure of swashplate axial piston pump based on multi-objective genetic algorithm is proposed. Firstly, the CFD (computational fluid dynamics) simulation analysis method was used to analyze the generation mechanism of pressure-flow pulsation at the upper/lower dead points of the axial piston pump; secondly, the influence of damping groove structural parameters on the output pressure-flow pulsation of axial piston pump was analyzed, and a multi-objective optimization model of damping groove structure was constructed; finally, the structure of the low pulsation damping groove was solved. The optimized structural parameters were as follows: the damping groove radius was 2.21 mm, the damping groove length was 10.32 mm, and the damping groove deflection angle was 16.54°. After optimization, the pressure pulsation rate was 0.59%, which was reduced by 0.16% compared to the pre-optimization value of 0.75%, and the pulsation amplitude was 0.25 MPa. The flow pulsation rate was 12.02%, which was reduced by 43.59% compared to the pre-optimization rate of 55.61%. The research results provide effective theoretical support and practical guidance for the optimal design of low pulsation structure of axial piston pump.
Fig.1 Structural profile of rotor of axial piston pump
Fig.2 Structure of mating surface of valve plate and cylinder body of axial piston pump
Fig.3 Flow field division of axial piston pump
交界面
边界类型
吸/排油流域与配流腰型窗口流域交界面
inlet_mgi_vp
配流腰型窗口流域与配流副间隙油膜交界面
vp_mgi_film
配流副间隙油膜与缸体柱塞孔顶部窗口交界面
film_mgi_piston
柱塞流域底部窗口与滑靴流域顶部窗口交界面
piston_mgi_shoe
Table 1Setting of interaction boundary of flow field model of axial piston pump
Fig.4 Outlet flow curve of axial piston pump
Fig.5 Schematic of movement starting position of piston cavity
Fig.6 Inlet flow curve of piston pump and pressure curve of piston cavity in one pulsating period
Fig.7 Pressure curve of single piston cavity of axial piston pump
Fig.8 Cloud map of pressure variation in pre-boost area of axial piston pump
Fig.9 Structure of valve plate
Fig.10 Cloud map of pressure distribution in full contact between damping groove and piston cavity (spindle rotating 21°)
Fig.11 Cloud map of turbulent kinetic energy at reinforcement of valve plate (spindle rotating 21°)
Fig.12 Schematic of key structural parameters of cylindrical damping groove
Fig.13 Optimization process of structural parameter of damping groove
Fig.14 Outlet pressure curves of axial piston pump under different damping groove radius
Fig.15 Outlet flow curves of axial piston pump under different damping groove radius
Fig.16 Outlet pressure curves of axial piston pump under different damping groove lengths
Fig.17 Outlet flow curves of axial piston pump under different damping groove lengths
Fig.18 Outlet flow curves of axial piston pump under different damping groove deflection angles
Fig.19 Outlet pressure curves of axial piston pump before and after optimization
Fig.20 Outlet flow curves of axial piston pump before and after optimization
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