Filtering Characteristics of WJGL Pulsation Attenuator Based on Electro-Hydraulic Analogy Principles

doi:10.3969/j.issn.1004-132X.2025.09.007

Abstract

Abstract:

In WJGL， the instability in water jet from low-frequency pressure pulsations （0~500 Hz） in fluid supply systems needed urgent resolution. A water pressure pulsation attenuator was designed using flexible liners for coupling vibrations and Herschel-Quincke tubes （HQ tubes） for phase cancellation， achieving dual filtering. A transfer matrix model was established based on one-dimensional analytical approach and electro-hydraulic analogy principle， and the feasibility was experimentally verified through prototype testing. The influence mechanism of key parameters， such as HQ tube structures， insert tube lengths， and liner elastic modulus on low-frequency pulsation attenuation were quantitative analyzed in simulations. The results show that the damping performance of polyurethane liners improves as their elastic modulus decreases， while the loss angle negatively affects transmission loss. Under certain conditions， changing the insert tube lengths has minimal impact on transmission loss（TL）， but increasing the HQ tube lengths and reducing the diameter enhances attenuation.

Key words: water jet guided laser（WJGL） fluid supplying system, low frequency pressure pulsation, electro-hydraulic analogy method, transfer matrix acoustic model

摘要：

供液系统低频压力脉动（0~500 Hz）导致的水束不稳定是水导激光（WJGL）中急需解决的问题。设计了一种利用柔性衬里耦合振动及Herschel-Quincke 管（HQ管）反相位相消原理实现双重滤波的水压脉动衰减器。采用一维解析法及电液类比原理建立传递矩阵模型，通过试验验证理论建模的可行性。通过仿真定量分析了HQ管结构参数、内插管长度、衬里弹性模量等关键参数对低频脉动抑制效果的影响机制。结果表明，聚氨酯衬里的减振能力随着其弹性模量的减小而增强，损耗角对传递损失具有负面影响；在一定条件下改变内插管长度对传递损失影响不大，而增大HQ管的长度和减小管径可以增强衰减效果。

关键词: 水导激光供液系统, 低频压力脉动, 电液类比法, 传递矩阵声学模型

CLC Number:

TH137

Chaozhong MENG, Fan YANG, Jiaxin YU, Yuqiang WANG. Filtering Characteristics of WJGL Pulsation Attenuator Based on Electro-Hydraulic Analogy Principles[J]. China Mechanical Engineering, 2025, 36(9): 1961-1967.

孟朝中, 杨帆, 余家欣, 王宇强. 基于电液类比原理的水导激光水压脉动衰减器滤波特性[J]. 中国机械工程, 2025, 36(9): 1961-1967.

Figures/Tables 13

Fig.1 Comparison of DTETC theoretical insertion loss with experimental measurements［11］

Fig.2 Schematic diagram of hydraulic pulsation attenuator test platform

Fig.3 Hydraulic pulsation test section test rig

Fig.4 Hydraulic pulsation test result

Fig.5 Composite pulsation attenuator acoustic unit division

Fig.6 Equivalent circuit model of flexible liner

Tab.1 parameter setting

类别	参数	数值
水参数	运动黏度/（m²·s^-1）	1.01×10^-6
	密度ρ/（kg·m^-3）	890
	体积弹性模量/GPa	2.18
	动力黏度/（Pa·m）	46
弹性模量参数	不锈钢的弹性模量/GPa	200
	聚氨酯储能弹性模量/MPa	15.97
	橡胶厚度/mm	30
管道参数	内插管直径/mm	38
	内插管1长度/mm	78
	内插管2长度/mm	39
	扩张室直径/mm	90
	扩张室长度/mm	175
	HQ管长度/mm	600
	HQ管直径/mm	20

Fig.7 Schematic structure of a composite pulsation attenuator

Fig.8 Influence of HQ tube structural parameters on the transmission loss of pulsation attenuators

Fig.9 The effect of HQ tube length on transmission loss of hydraulic pulsation attenuators

Fig. 10 The effect of endotube length on transmission loss of pulsatile attenuators

Fig.11 The effect of storage bulk modulus on transmission loss of pulsation attenuators

Fig.12 The effect of tangent loss angle on transmission loss of pulsation attenuators

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