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Experimental and numerical investigation on the noise development in fluid power units: an overview

Fiebig Wiesław, Wróbel Jakub

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e166, 2022

Low noise fluid power units become a rapidly increasing demand in modern industry. This paper describes the generation of vibrations and noise in fluid power units, which in many industrial applications have a decisive influence on the increased noise emission. The causes of vibrations and noise in displacement pumps were first described which are loaded with very high dynamic forces originating from variable pressures. For this reason, positive displacement pumps are often considered the main sources of noise in fluid power units. The location of noise sources shows that often other fluid power unit elements having a larger surface area, such as the electric motor and the tank, can be decisive in the generation of noise. A system-based approach is considered, whereby the entire structure of the fluid power unit, including the fluid. In particular, the FE model of the fluid power unit was developed to calculate the system's natural frequencies, which has been validated using experimental modal analyses. Based on the FEA results, the sensitivity analysis enables the determination of changes leading to the reduction of vibrations and noise. The presented approach can be extended to other configurations of system components and contributes to the development of quieter fluid power units.

Location of Noise Sources in Fluid Power Machines

Fiebig W.

International Journal of Occupational Safety and Ergonomics

2007

Vol. 13, No. 4

441--450

This paper discusses noise generation mechanisms and techniques for noise reduction in fluid power units. Major noise sources in fluid power units can be identified with a sound intensity method. It has been proved that components of power units with larger sound radiating surfaces such as an electric motor and an oil reservoir produce a major part of global noise radiation.