Characteristics and High-Precision Positioning Analysis of Fluid-Solid Noise Sources in Inclined Axis Piston Motor

doi:10.12141/j.issn.1000-565X.250044

Abstract

Abstract:

As the main actuator in hydraulic systems, motors generate significant noise radiation that increasingly fails to meet low-noise requirements. Due to unresolved issues such as unclear primary noise sources and low loca-lization accuracy, noise reduction in motors remains challenging. Therefore, to identify the main noise sources and improve localization accuracy, this study employed multiple approaches: A fluid simulation model of the motor was established using Pumplinx software to obtain the variation of fluid excitation forces at the motor’s port plate. A co-simulation using ADAMS and AMESim was conducted to acquire the variation of excitation forces caused by pistons impacting the cylinder block during motor operation. Combined with transient finite element analysis, the transient analysis method in ANSYS was used to obtain the vibration displacement response on the surfaces of the motor housing and rear end cover. Using this vibration data from ANSYS as acoustic boundary conditions, a boundary element analysis was performed in LMS Virtual Lab to simulate the motor’s acoustic field, thereby identifying the main noise sources and primary noise generation areas. Subsequently, a motor sound intensity noise test bench was designed to obtain sound intensity variation cloud maps, verifying the accuracy of the multi-physics simulation results. Then, considering the relationships among the observation matrix, sparse representation, and reconstruction algorithm, the regularized orthogonal matching pursuit reconstruction algorithm was adopted to determine the loca-lization areas of the main motor noise. Finally, the feasibility of the optimized reconstruction algorithm in improving loca-lization accuracy was verified with the sound intensity test bench. The results show that the multi-physics field simulation of the motor model is correct, the main noise sources are the pressure impact at the valve plate and piston collisions, the main noise area is distributed around the valve plate, and the new localization accuracy reaches 25 mm, achieving the determination of the main motor noise sources and an improvement in localization accuracy.

Key words: inclined axis piston motor, fluid-solid noise source, exciting force analysis, sound intensity image, regularized orthogonal matching pursuit

CLC Number:

TH137.51

CHEN Fulong, HUANG Hui, DU Heng, SU Junshou, LI Yuzheng, LI Fuqi. Characteristics and High-Precision Positioning Analysis of Fluid-Solid Noise Sources in Inclined Axis Piston Motor[J]. Journal of South China University of Technology(Natural Science Edition), 2026, 54(1): 149-160.

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网格尺寸/ mm	压力误差/%	计算时间/h
0.080	3.5	0.3
0.050	2.0	1.5
0.020	1.5	4.0
0.010	1.3	10.0
0.008	1.2	20.0

设置项目	参数
动力黏度/（Pa·s）	0.007
油液密度/（kg·m^-3）	870
弹性模量/MPa	1 500
饱和压力/Pa	400
环境温度/K	333

设备	类型	参数
电机	功率/kW	200
电机	最大转速/（r·min^-1）	2 980
液压泵	最大排量/（cm³·r^-1）	160
液压泵	最高转速/（r·min^-1）	2 000
斜轴式马达	最大排量/（cm³·r^-1）	80
斜轴式马达	额定压力/MPa	35
压力传感器	测量范围/MPa	0~40
压力传感器	精度	±0.25%FS
数据采集卡	最大采样频率/kHz	204.8
数据采集卡	高精度通道数	6
声强探头	灵敏度/（mV·Pa^-1）	11.2
声强探头	幅值响应偏差/dB	0.2
声强校准器	校准频率/Hz	251.2