URN etd-0901111-112226 Statistics This thesis had been viewed 2047 times. Download 1287 times. Author Yuan-Hung Chien Author's Email Address No Public. Department Mechanical Engineering Year 2010 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 132 Title Boundary Element Analysis and Shape Optimization of Multiple Absorption and Reflection Plenum Chambers Keyword I-DEAS Partition Transmission Loss SYSNOISE SYSNOISE Transmission Loss Partition I-DEAS Abstract This paper uses acoustic analysis software – SYSNOICE, one kind of boundary element method (BEM). Its main purpose is to study the acoustical-performance analysis for an acoustical plenum with multiple sound absorption and reflection cancellation size design.
The model number will be planed. Later, using the I-DEAS software, the outline model with battles and sound- absorbing material is established and imported to the SYSNOISE for further assessment of plenum’s sound transmission loss (TL).
Paper is divided into three parts : (1) to investigate the influence of the acoustical plenum’s performance with respect to both the number and allocation of the battles inside the plenum. (2) to optimally design the best shape of the acoustical plenum with multiple sound absorption and reflection by using the number networks and genetic algorism in conjunction with the finite element method (FEM). (3) to assess the acoustical performance for the acoustical plenum using a series of experimental works.
An accuracy verification is performed and found to be in good agreement by using the experimental data and the theoretical value. Consequently, the optimization applied in industry corn effectively reduces the design time, lower the manufacturing cost and enhance the product competitiveness.Advisor Committee Ying-Chun Chang - advisor
Min Chie Chiu - co-chair
Spin Liaw - co-chair
Files indicate accessible at a year Date of Defense 2011-07-23 Date of Submission 2011-09-01