碩士 / 國立臺灣海洋大學 / 輪機工程學系 / 107 / According to governing equation, the analysis of propeller noise can be divided into transient analysis and steady-state analysis, different results can be used to analyze physical characteristics of propeller, and finally, constructing the verification procedures of propeller noise. That is to say, through comparing the phenomena of transient analysis and steady-state analysis, the accurate of sound field radiation can be vertified. For transient analysis, Calculateing the differential pressure generated by propeller blade surface flow is based on unsteady Reynold-averaged Navier-Stokes equation (URANS), Through Ffowcs-Williams and Hawkings acoustic model (FW-H model) solves the transient propeller noise base on finite volume method (FVM). For steady-state analysis, substituting dipole for propeller blade sound pressure and extracting propeller blade pressure pulsation from a transient propeller flow field as the boundary condition, the steady state propeller noise is solved by the boundary element method (BEM). Comparing the result of transient analysis and steady-state analysis, the sound pressure qualitative trends are consistent, as a result it proves that certain accuracy is exist in transient and steady-state analyses of propeller noise, Moreover, the results satisfy sound field radiation characteristics of near-field and far-field and are critical in engineering applications and military applications.
| Identifer | oai:union.ndltd.org:TW/107NTOU5484026 |
| Date | January 2019 |
| Creators | Yang, Wen-Chih, 楊文智 |
| Contributors | Soon, Shin-Ping, 宋世平 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 71 |
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