Modeling Noise Sources and Propagation in External Gear Pumps

Abstract

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.

Design of Delivery Valve for Hydraulic Pumps

“…with k ranging between 30 and 100. Assigning n, and µ•v being already fixed, as has been said discussing (14), Formula (38) allows us to establish a/sinδ so that, in the case of the ring valve, if it is accepted that the speed in the section (π/4) (d e (33) and (34)), its value is 2•h max .…”

“…The time integration step has been chosen so as to ensure the fulfillment of the stability constraints of the numerical scheme used. These methods were applied also in other papers [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”

Three-dimensional model of an external gear pump with an experimental evaluation of the flow ripple

“…The possibility of directly measuring such a ripple could be useful to determine the source of the fluid-borne noise. 25…”

Energy Efficiency and Controllability of Fluid Power Systems

“…Woo et al [11] consider a similar design for a pressure compensated external gear pump, and perform instead a study related to the numerical prediction of the airborne noise emitted by the pump. In their work, they present a simulation model than includes the numerical prediction of the noise at all the domains: fluid-borne noise, structure-borne noise, and air-borne noise.…”

“…New approaches for the analysis, modeling, and design of hydraulic and pneumatic components This book contains the successful invited submissions [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] to the Special Issue.…”