Coupling Characteristics of Pressure Pulsation in the High-pressure Oil Circuit of Piston Pump-motor System

doi:10.12382/bgxb.2024.0405

Abstract

Abstract:

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.

Key words: piston pump-motor system, pressure pulsation, coupling characteristics, spectral structure, signal decoupling algorithm

CLC Number:

TH137

WANG Hujiang, MAO Ming, LIN Yu, MAO Feihong, WANG Tao, TANG Shousheng, BAO Qianqian. Coupling Characteristics of Pressure Pulsation in the High-pressure Oil Circuit of Piston Pump-motor System[J]. Acta Armamentarii, 2024, 45(11): 3781-3791.

Figures/Tables 16

Fig.1 Schematic diagram of piston pump-motor system

Fig.2 Structure of valve plate in the piston pump-motor system

Fig.3 Calculation of the bulk modulus of oil by Wylie model

Table 1 Main parameters of piston pump-motor system

参数	数值
柱塞直径d/mm	31
斜盘最大摆角α/(°)	17.5
配流盘的闭死角θ'/(°)	33
柱塞腔尾端腰型槽夹角θ₀/(°)	30
高压油路容积V_h/mm³	3.4×10⁵
油液密度ρ/(kg·m^-3)	702
油液运动黏度ν/(mm²·s^-1)	20.8
油液体积含气率c(标准大气压下)	0.005

Fig.4 Schematic diagram of the connectivity of high-pressure oil circuit in the pump-motor system

Fig.5 The variation curves of the pulsation component of the outlet flow of the pump and the pulsation component of the inlet flow of the motor as the function of the cylinder block rotation angle

Fig.6 Variation of the volume of oil in the piston chamber of pump (motor) with the rotation angle of the cylinder of pump (motor)

Fig.7 Interaction of flow distribution impacts of the piston pump and piston motor

Fig.8 Signal spectrum of pump outlet flow, motor inlet flow and pump-motor high pressure

Fig.9 Measured high-pressure signal of pump-motor

Fig.10 Spectrum of the measured high-pressure signal

Fig.11 Comparison of the simulated and test results

Fig.12 Decoupling method for high-pressure pulsation signal based on characteristic frequency

Fig.13 Decomposition and reconstruction of pump outlet pressure pulsation signal

Fig.14 Contributions of pump source component and motor source component to high-pressure pulsation under 12 test conditions

Fig.15 Average percentages of pump source contribution and motor source contribution under all operating conditions

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