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The defense date of the thesis is 2015-08-22
The current date is 2019-05-22
This thesis will be accessible at 2020-08-22
URN etd-0822115-163949 Statistics This thesis had been viewed 650 times. Download 3 times. Author Shiuan-En Huang Author's Email Address No Public. Department Mechanical Engineering Year 2014 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 89 Title Three-Dimensional Acoustic Analysis and Design Optimization of Straight and Reversing Muffler Systems Keyword transmission loss three-dimensional acoustic optimization plane wave reversing muffler reversing muffler plane wave optimization three-dimensional acoustic transmission loss Abstract According to plane wave theory, the sound will propagate in mufflers only in a plane wave type at low frequencies; however, for a high frequency, the higher-order mode effect occurred will result in a difference between the measurement and the theory. Currently, the acoustical analysis of three-dimensional propagating inside a one-chamber muffler has been widely discussed; however, the research work of a multi-chamber hybridized with baffles and reversing muffler is few. Therefore, the acoustical performances of reversing chamber mufflers hybridized with multiple baffles in a three-dimensional acoustic mode will be explored in this paper. In addition, the shape optimization of the space-constrained one-chamber hybridized with various baffles will be fulfilled by adjusting the chamber and inlet/outlet tube size.
In this paper, eigen function expansion method will be used to derive the four-port transfer matrix to calculate the acoustic performance of three-dimensional wave propagation in mufflers. Subsequently, analyzing the performance for various mufflers and comparing the theoretical data with the literature yield that the mathematical model of the mufflers is correct. In order to maximize the acoustical performance, the shape optimization of mufflers in conjunction with the genetic algorithm is performed.
Advisor Committee Ying-Chun Chang - advisor
Min-Chie Chiu - co-chair
Shih-Pin Liaw - co-chair
Files Date of Defense 2015-07-17 Date of Submission 2015-08-22