A frequency domain-based study for fluid-borne noise reduction in hydraulic system with simple passive elements
by Leandro Danes; Andrea Vacca
International Journal of Hydromechatronics (IJHM), Vol. 4, No. 3, 2021

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.

Online publication date: Thu, 07-Oct-2021

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