柱塞泵马达高压油路压力脉动耦合特性

doi:10.12382/bgxb.2024.0405

摘要/Abstract

摘要：

柱塞泵马达系统高压油路存在固有的压力脉动现象,其激发振动和噪音,恶化动力传递的平稳性,严重影响系统的可靠性和寿命。以往的研究主要聚焦于高压柱塞泵的压力脉动,而对柱塞泵马达系统高压油路的压力脉动耦合特性缺少研究。针对以上问题,通过揭示柱塞泵马达系统高压油路压力脉动的耦合机理及耦合特征,提出柱塞泵马达系统高压油路压力脉动解耦新方法。利用解耦新方法研究发现,泵源激励是贡献柱塞泵马达系统高压油路压力脉动的主要根源。对于所研究的联体设计的泵马达,在泵满排量状态下,泵源激励对高压脉动的平均贡献占比高达72%,而马达贡献占比仅为28%。新方法及所得到的新结论加深了对柱塞泵马达系统高压油路压力脉动耦合特性的认识,为进一步抑制和利用柱塞泵马达系统高压油路的压力脉动现象提供了理论支撑。

关键词: 柱塞泵马达, 压力脉动, 耦合特性, 频谱结构, 信号解耦算法

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

中图分类号:

TH137

汪浒江, 毛明, 林宇, 毛飞鸿, 王涛, 唐守生, 包倩倩. 柱塞泵马达高压油路压力脉动耦合特性[J]. 兵工学报, 2024, 45(11): 3781-3791.

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.

图/表 16

图1 柱塞泵马达系统原理图

Fig.1 Schematic diagram of piston pump-motor system

图2 柱塞泵马达系统中配流盘结构

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

图3 Wylie模型对油液体积弹性模量的计算结果

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

表1 柱塞泵马达系统主要参数

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

图4 泵马达高压油路连通关系示意图

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

图5 泵出口流量脉动分量和马达入口流量脉动分量随缸体转角的变化曲线

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

图6 泵(马达)柱塞腔油液体积随泵(马达)缸体转角变化曲线

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)

图7 柱塞泵和柱塞马达配流冲击相互作用

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

图8 泵出口流量、马达入口流量和泵马达高压频谱

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

图9 实测泵马达高压信号

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

图10 实测高压信号频谱

Fig.10 Spectrum of the measured high-pressure signal

图11 仿真与试验结果对比

Fig.11 Comparison of the simulated and test results

图12 基于特征频率的高压脉动信号解耦方法

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

图13 泵出口压力脉动信号分解与重构

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

图14 12个测试工况泵源分量和马达源分量对高压脉动的贡献占比

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

图15 全部工况下泵源及马达源贡献平均占比

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

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