| Summary: | 碩士 === 大同大學 === 機械工程學系(所) === 101 === In this thesis, the acoustic professional boundary element analysis software SYSNOISE (Boundary element method, BEM) method as well as the multiple physical quantities coupled numerical analysis software COMSOL Multiphysics Finite Element (Finite element method, FEM) analysis are adopted. The primary purpose of the research is to assess the acoustical performance of the side inlet/outlet plenums and the multi-fin plenums.
The plenums will be planned and modelled. The plenum’s model will be built by using the computer-aided software. Thereafter, this plenum’s model will be grided and imported into the acoustical analysis to asses the acoustical performance of the plenum.
The thesis has three main axes: (1) A straight-through muffler is changed as a side inlet/outlet plenum. The thin baffles, the extended baffles, and the bilateral extended tubes will be added inside the side inlet/outlet plenum. The acoustical influences with respect to the lengths and the tilt angle of the baffles, extended baffles, and the bilateral tubes will be explored in this paper. (2) The acoustical influences with respect to the number of the baffles and the allocation of the baffles within a length-fixed plenum will be assessed using the COMSOL software.(3) The best allocation of the baffles inside the plenum will be explored using the artificial neual network and the GA optimizer.
Consequently, the plenum design is performed using the SYSNOISE, the COMSOL, the artificial neual netwirk, and the Genetic Algortihm. The acoustical performance of the multi-chamber side inlet/outlet plenum will be optimally improved. The plenum’s competition in market will largely increase.
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