柱塞泵马达高压油路压力脉动耦合特性

There is inherent pressure pulsation in the high-pressure oil circuit of piston pump-motor system, which causes vibration and noise, and worsens the smoothness of power transmission, thus having serious effect on the reliability and life of the system. Previous studies have focused on the pressure pulsation in high-pressure piston pumps. However, there is a lack of research on the coupling characteristics of pressure pulsation in the high-pressure oil circuit of piston pump-motor system. To address the above problems, the coupling mechanism and characteristics of the pressure pulsation in the high-pressure oil circuit of piston pump-motor system are revealed, and a new method of decoupling the pressure pulsation in the high-pressure oil circuit of piston pump-motor system is proposed. The pump source excitation is found to be the primary source of pressure pulsation in the high-pressure oil circuit of piston pump-motor system by using the proposed decoupling method. For the coupled pump motor in the paper, the average contribution of pump source excitation to the pressure pulsation is as high as 72% when the pump is at full displacement, while the contribution of motor to the pressure pulsation is only 28% . The proposed method and the conclusions drawn deepen the understanding of the coupling characteristics of pressure pulsation in the high-pressure oil circuit of piston pump-motor system. This provides theoretical support for the further suppression and utilization of the pressure pulsation in the high-pressure oil circuit of piston pump-motor system.