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Content available remote Experimental and numerical investigation on the noise development in fluid power units: an overview
Fiebig Wiesław, Wróbel Jakub
Archives of Civil and Mechanical Engineering
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2022
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Vol. 22, no. 4
art. no. e166, 2022
EN
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.
2
Content available remote Analysis of vane loads and motion in a hydraulic double vane pump with integrated electrical drive
Fiebig Wiesław, Cependa Piotr, Kuczwara Hubert, Wang Feng
Archives of Civil and Mechanical Engineering
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2021
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Vol. 21, no. 3
472--486
EN
In this paper, the results of the analysis of the forces acting on vanes in a double-acting vane pump with an integrated electric drive have been presented. In the new motor pump unit, the pump is assembled inside the rotor of the electric motor. A dynamic model representing the vane movement has been developed considering the impact of pressure load distribution, vane support forces and friction forces. The loss of contact between the vane head and the cam ring lead to the noise and reduction of the volumetric pump efficiency. The dynamic model which describes the vane motion and contact between the vane tip and cam ring has been solved using MATLAB software. The influence of load distribution, pump design and operational parameters on the vane dynamics has been analysed.
3
Content available remote Energy accumulation in mechanical resonance and its use in drive systems of impact machines
Fiebig Wiesław, Wróbel Jakub
Archives of Civil and Mechanical Engineering
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2020
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Vol. 20, no. 1
415--425
EN
An innovative method utilizing the phenomenon of mechanical resonance in machine drive systems of impact machines has been described. Energy accumulated in mechanical resonance is typically multiple times larger than the continuously supplied excitation energy. The amount of accumulated energy depends on the amplitude of vibration, mass and stiffness of system and present energy dissipation mechanisms. This form of energy can be extracted periodically each time after the amplitude of vibration reaches its maximum value. This effect could be implemented in drive systems of periodically operating machines, such as punching machines and presses. Significant reduction of energy demand in machines that use mechanical resonance in comparison with conventional machines was confirmed by means of simulations and experiments. Accumulation of the energy at mechanical resonance and its sequential extraction were presented together with a new pro-totype resonance punching press.
4
Content available Use of Acoustic Camera for Noise Sources Localization and Noise Reduction in the Industrial Plant
Fiebig Wiesław, Dąbrowski Damian
Archives of Acoustics
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2020
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Vol. 45, No. 1
111--117
EN
The paper presents results of the localization of main noise sources in the industrial plant. Identification of main noise sources was made with an acoustic camera using Beamforming Method. Parallel to the measurements by means of the acoustic camera, sound level measurements on the main noise sources have been performed. Based on the calculations, prediction regarding the noise emission at residential buildings located near to the plant has been determined. Acoustic noise maps have been performed with LEQ Professional software, which includes the 3D geometry of the buildings inside the plant. It has been established that, after introduction of noise reduction measures in the plant, the noise levels at the observation points in the residential area meets the limit values.
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