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Sound Field Modelling and Noise Reduction for a Forklift Power Compartment Based on Perfectly Matched Layer and Acoustic Packaging Design

Zhang Enlai, Liu Zhiqi, Zhang Jingjing, Lin Jiahe

Archives of Acoustics

2021

Vol. 46, No. 3

491--498

The core goal of this paper is to put forward a feasible scheme of noise reduction for a target forklift on the basis of solving the problem of vibration and acoustic radiation from complex structures in infinite domain. Based on the previous report and vibration acceleration tests, the acoustic virtual wind tunnel model of forklift power compartment was established using finite element method and boundary element method, in which the perfectly matched layer was first applied to simulate the attenuation propagation of sound waves in air. In addition, according to the distribution characteristics of sound pressure field with different frequencies, the acoustic energy mainly radiated through the bottom and right side, and concentrated in the low frequency. Consequently, the acoustic packaging design for the whole forklift power compartment was presented, and a satisfying noise reduction effect was achieved.

Vibro-acoustic Modelling of Machines

Engel Z., Stryczniewicz L.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2001

vol. 49, nr 2

379-392

Problems concerning the modelling of the vibro-acoustic emission of machines have been presented in the paper. Several algorithms useful in modelling of the acoustic field around machines have also been shown. Results of acoustic pressure and sound intensity measurements around industrial sound sources were the bases of model formations. The sound field modelling of the actual sound source by the pressure method requires the estimation of the spatial sound pressure distribution. Measurements of the sound intensity around machines performed by a dual-microphone probe are quite common in industry. These results can be utilised for the development of substitute sound models based on the intensity method. Described methods can be also useful in constructing models of pipelines treated as a system of cylindrical sources. Mathematical equations, algorithms of modelling and exemplary calculation results are also presented in the paper.