Reduction of axial piston pump pressure ripple

Harrison, K A; Edge, K A

doi:10.1243/0959651001540519

Cited by 63 publications

(43 citation statements)

References 1 publication

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“…The axial piston pump including nine pistons is driven by a variable-speed motor. One noticeable point is that the source flow ripple radiated from the axial piston pump can interact with the characteristics of the hydraulic circuit to produce pressure pulsations in the hydraulic energy system [22][23][24]. The pressure pulsations are transmitted from the source (pump) through the servo-valve to the oil tank.…”

Section: Transmission Of the Pressure Pulsations Inside A Hydraulic Ementioning

confidence: 99%

“…The pump parameters such as the pump speed, piston number and maximum supply pressure greatly affected the pressure pulsations of the hydraulic energy system and its components in practice [20][21][22]. However, from the previous works, it can be seen that the self-excited (squeal) noise of the servo-valve has been paid little attention in their studies since it was hardly excited by the servo-valve in the experiment.…”

Section: Introductionmentioning

confidence: 99%

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Suppression of Squeal Noise Excited by the Pressure Pulsation from the Flapper-Nozzle Valve inside a Hydraulic Energy System

Chen

Xiang

et al. 2018

Energies

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Squeal noise often occurs in a two-stage electrohydraulic servo-valve, which is an unfavorable issue of modern hydraulic energy systems. The root causes of such noise from the servo-valve are still unclear. The objective of this paper is to explore the noise mechanism in a servo-valve excited by the pressure pulsations from the hydraulic energy system perspective. The suppressing capability of squeal noise energy is investigated by changing the pressure pulsation frequency and natural frequency of the flapper-armature assembly. The frequencies of the pressure pulsations are adjusted by setting different speeds of the hydraulic pump varying from 10,400-14,400 rpm, and two flapper-armature assemblies with different armature lengths are used in the tested hydraulic energy system. The first eight vibration mode shapes and natural frequencies of the flapper-armature assembly are obtained by numerical modal analysis using two different armature lengths. The characteristics of pressure pulsations at the pump outlet and in the chamber of the flapper-nozzle valve, armature vibration and noise are tested and compared with the natural frequencies of the flapper-armature assembly. The results reveal that the flapper-armature assembly vibrates and makes the noise with the same frequencies as the pressure pulsations inside the hydraulic energy system. Resonance appears when the frequency of the pressure pulsations coincides with the natural frequency of the flapper-armature assembly. Therefore, it can be concluded that the pressure pulsation energy from the power supply may excite the vibration of the flapper-armature assembly, which may consequently cause the squeal noise inside the servo-valve. It is verified by the numerical simulations and experiments that setting the pressure pulsation frequencies different from the natural frequencies of the flapper-armature assembly can suppress the resonance and squeal noise.

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Section: Transmission Of the Pressure Pulsations Inside A Hydraulic Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suppression of Squeal Noise Excited by the Pressure Pulsation from the Flapper-Nozzle Valve inside a Hydraulic Energy System

Chen

Xiang

et al. 2018

Energies

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“…While some works focus on reducing internal sources of SBN [2], the main focus in most research on noise in hydraulic pumps is on reducing the magnitude of the pressure ripple oscillations at the outlet port [3][4][5][6][7][8]. For EGMs, this effort has resulted in the formulation of design solutions that involve tooth profile modifications able to reduce the kinematic flow oscillations: Manring and Huang formulated criteria suitable for standard involute designs [6,9]; Negrini introduced the so-called dual-flank principle, a zero-backlash solution currently adopted by several manufacturers that permits to increase the number of displacement chambers [4] to reduce the flow oscillations.…”

Section: Introductionmentioning

confidence: 99%

Modeling Noise Sources and Propagation in External Gear Pumps

et al. 2017

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As a key component in power transfer, positive displacement machines often represent the major source of noise in hydraulic systems. Thus, investigation into the sources of noise and discovering strategies to reduce noise is a key part of improving the performance of current hydraulic systems, as well as applying fluid power systems to a wider range of applications. The present work aims at developing modeling techniques on the topic of noise generation caused by external gear pumps for high pressure applications, which can be useful and effective in investigating the interaction between noise sources and radiated noise and establishing the design guide for a quiet pump. In particular, this study classifies the internal noise sources into four types of effective load functions and, in the proposed model, these load functions are applied to the corresponding areas of the pump case in a realistic way. Vibration and sound radiation can then be predicted using a combined finite element and boundary element vibro-acoustic model. The radiated sound power and sound pressure for the different operating conditions are presented as the main outcomes of the acoustic model. The noise prediction was validated through comparison with the experimentally measured sound power levels.

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“…The research group led by Palmberg set a precompression volume in valve plate between the discharged kidney slot and sucked kidney slot [17]. They found that small precompression volume can amazingly lessen enormous problems of noise, pulsation, and hydraulic impact [18,19]. And an axial piston pump's valve plate which adopts a prepressurization fluid path consisting of a damping hole, a buffer chamber, and an orifice can reduce flow ripple to some extent [20].…”

Section: Introductionmentioning

confidence: 99%

Research on Distribution of Flow Field and Simulation of Working Pulsation Based on Rotating-Sleeve Distributing-Flow System

Zhang

Yang

Zhao

et al. 2017

Modelling and Simulation in Engineering

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To solve problems of leakage, vibration, and noise caused by disorders of flow field distribution and working pulsation in the rotating-sleeve distributing-flow system, governing equations of plunger and rotating sleeve and computational fluid dynamics (CFD) model are developed through sliding mesh and dynamic mesh technology to simulate flow field and working pulsation. Simulation results show that the following issues exist: obviously periodic fluctuation and sharp corner in flow pulsation, backward flow when fluid is transformed between discharge and suction, and serious turbulence and large loss in kinetic energy around the damping groove in transitional movements. Pressure in the pump chamber rapidly rises to 2.2 MPa involving over 10% more than nominal pressure when the plunger is at the Top Dead Center (TDC) considering changes about damping groove's position and flow area in two transitional movements. Shortly pressure overshoot gradually decreases to a normal condition with increasing flow area. Similarly, pressure in the pump chamber instantaneously drops to a saturated vapor pressure −98.9 KPa when the plunger is at the Bottom Dead Center (BDC). With increasing flow area the overshoot gradually increases to the normal condition. This research provides foundations for investigating flow field characteristic and structure optimization of rotating-sleeve distributingflow system.

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Reduction of axial piston pump pressure ripple

Cited by 63 publications

References 1 publication

Suppression of Squeal Noise Excited by the Pressure Pulsation from the Flapper-Nozzle Valve inside a Hydraulic Energy System

Suppression of Squeal Noise Excited by the Pressure Pulsation from the Flapper-Nozzle Valve inside a Hydraulic Energy System

Modeling Noise Sources and Propagation in External Gear Pumps

Research on Distribution of Flow Field and Simulation of Working Pulsation Based on Rotating-Sleeve Distributing-Flow System

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