下載電子全文宣告This thesis is authorized to indicate in-campus access at one year and off-campus not accessible
You can not download at the moment.
Your IP address is 22.214.171.124
The defense date of the thesis is 2013-08-19
The current date is 2019-02-22
This thesis will be accessible at off-campus not accessible
URN etd-0819113-195050 Statistics This thesis had been viewed 1255 times. Download 3 times. Author Yi-Hsin Chou Author's Email Address No Public. Department Mechanical Engineering Year 2012 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 100 Title Performance Analysis and Optimization of Rectangular Expansion Chamber with Multiple Internal Connected and Side Inlet/Outlet tubes Keyword SYSNOISE COMSOL side inlet/outlet side inlet/outlet COMSOL SYSNOISE Abstract 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.
Advisor Committee Ying-Chung Chang - advisor
Min-Chie Chiu - co-chair
Spin Liou - co-chair
Files Date of Defense 2013-07-19 Date of Submission 2013-08-19