Thesis (M.Sc.Eng.) PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / In previous works, baffled-piston with small ratio of piston radius a over the baffle wall aperture radius b, or say, small gap was discussed on subjects mainly focused on acoustics gains. In this thesis, we focus more on baffled-piston models with large gaps and find out what could be the difference these new models may have on the acoustic gains. First we introduce a general description about the original models and further develop it into cavity-backed models with either closed or open end on one side. We use finite difference approximation to evaluate the influential parameters L and lE on acoustic gain. Afterwards calculate and plot curves for gains in related with piston motion frequency f for closed and open cavity models with different configuration parameters with are a/b, b/L and ΞΆ0/b and analyse them and compare with previous works. / 2031-01-01
| Identifer | oai:union.ndltd.org:bu.edu/oai:open.bu.edu:2144/21207 |
| Date | January 2014 |
| Creators | Li, Xiangyu |
| Publisher | Boston University |
| Source Sets | Boston University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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