STRUCTURAL CONFIGURATION AND ACOUSTICAL PERFORMANCE OF ENGINE EXHAUST MUFFLERS FOR CONSTRUCTION EQUIPMENT AND MACHINERY

Authors

  • Trong Cuong Le Le Quy Don Technical University
  • Van Hai Trinh Le Quy Don Technical University
  • Dinh Vu Dang Le Quy Don Technical University
  • Van Hien Nguyen Le Quy Don Technical University

DOI:

https://doi.org/10.56651/lqdtu.jst.v14.n03.444

Keywords:

Noise emission; engine exhaust muffler; construction equipment and machinery; sound transmission loss.

Abstract

The main objective of the present work is to characterize numerically the link between the geometrical parameters and the functional noise reduction properties of typical engine exhaust mufflers for construction equipment and machinery. To this regard, the acoustical modeling of these devices is first presented using the finite element approach. Then, we investigate the effects of both the geometrical parameters and the shape configuration of some typical mufflers (e.g., chambered, turbo, reactive, absorptive…) on their sound transmission loss. In terms of acoustics, for a given total length (600 mm), mufflers show a better acoustic performance (up to 50 dB) with a high number of chambers/partitions or using absorbing layers, especially micro-perforated panel with hole size of 24 mm and its fraction 48% can improve the sound transmission loss up to 100 dB at low frequency less than 1 kHz. The obtained results show clearly that the noise reduction target could be successfully achieved over an individual octave band or the whole frequency range by tuning structures of appropriate engine exhaust mufflers.

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Published

2022-10-26

How to Cite

Le, T. C. ., Trinh, V. H. ., Dang, D. V. ., & Nguyen, V. H. . (2022). STRUCTURAL CONFIGURATION AND ACOUSTICAL PERFORMANCE OF ENGINE EXHAUST MUFFLERS FOR CONSTRUCTION EQUIPMENT AND MACHINERY. Journal of Science and Technique, 14(03). https://doi.org/10.56651/lqdtu.jst.v14.n03.444

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