Title: A frequency domain-based study for fluid-borne noise reduction in hydraulic system with simple passive elements

Authors: Leandro Danes; Andrea Vacca

Addresses: Purdue University, Maha Fluid Power Research Center, 1500 Kepner Drive, 47905, Lafayette, IN, USA ' Purdue University, Maha Fluid Power Research Center, 1500 Kepner Drive, 47905, Lafayette, IN, USA

Abstract: This article performs a holistic study on passive elements for hydraulic lines to reduce fluid borne noise. The solutions are investigated by developing a line model based on the method of characteristics and simulating elements that are purely reactive and do not introduce energy in the system. Simple and cost-effective solutions such as closed branches and Quincke tubes (parallel lines) are selected, and properly sized through simulation results. A test setup is also created to implement and test these solutions experimentally. Four indicators (target pressure ripples) are chosen as a metric for summarising passive line elements behaviour in the frequency domain, targeting the 50-5,000 Hz frequency spectrum. The dependency of resonances based on the length of the line is identified and isolated in simulation. A pseudo-insertion loss power spectral is suggested as a metric of evaluation to compare attenuation when introducing the passive element preserving the circuit's original length. The experimental results show how the three passive elements are an effective solution for reducing noise, yielding to total sound pressure reduction up to 3 dB in some operation conditions with mitigation up to 15 dB in specific frequencies.

Keywords: fluid power; passive noise control; fluid borne noise reduction; Quincke tube; closed-branch silencer.

DOI: 10.1504/IJHM.2021.118006

International Journal of Hydromechatronics, 2021 Vol.4 No.3, pp.203 - 229

Received: 09 Sep 2020
Accepted: 16 Dec 2020

Published online: 29 Sep 2021 *

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