Experimental Study of Sound Pressure Level in Hydraulic Power Unit with External Gear Pump

Abstract

The article presents the results of an experimental study of the sound pressure level (SPL) caused by a hydraulic power unit with an external gear pump. The study was carried out with a specially developed laboratory experimental setup based on a common architecture used in hydraulic power units. Both the hydraulic system and the measuring equipment used are described in detail. The design of the experimental studies performed, including two main configurations with specific parameters regarding the operating modes of the system, is presented. The experimental results obtained are presented in the form of magnitude frequency responses which are compared in accordance with the experiment design. An analysis of the results obtained is performed using various quantitative indicators. For specific operating modes, parametric models were derived by approximation of the experimental data. The resulting models can serve in future work to reduce the SPL by passive or active means (e.g., frequency control of the electric motor). The quantitative analysis can serve as a basis of comparison with results obtained after adding passive (damping ring, etc.) or active means to reduce the SPL.

CFD Modeling and Experimental Validation of the Flow Processes of an External Gear Pump

“…[8][9][10][11][12][13][14][15]. The reason is the existing standards [16] define these characteristics only for the pump as an independent source of noise tested in an anechoic chamber but not for researching the noise characteristics during the operation of the pump in a hydraulic power unit at a normal working environment, with few exceptions [17]. On the other hand, through constructive (design) improvements, the volumetric efficiency could be increased, and this, in turn, motivated a number of studies focusing on gap sizes with the aim of reducing the internal volumetric losses (leakages) [18][19][20][21][22][23].…”

Advanced 2D Computational Fluid Dynamics Model of an External Gear Pump Considering Relief Grooves

“…Another significant part of the research is aimed at changing the number or geometric profile of the teeth in order to reduce the flow rate ripple [10][11][12][13][14]. Often, these studies also contribute to reducing the level or intensity of generated noise [15][16][17][18][19][20][21][22][23][24]. Not infrequently, the goal is to create modifications for continuous work at high pressure [25][26][27].…”