Title page for etd-0904107-105146


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URN etd-0904107-105146
Author Tsun-hsien Chao
Author's Email Address chao_tsunhsien@yahoo.com.tw
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Department Undersea Technology
Year 2006
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The Study of Ambient Noise in First Seaway area of Kaohsiung Harbor
Date of Defense 2007-07-14
Page Count 87
Keyword
  • Ship Noise
  • Ambient Noise
  • Kaohsiung Harbor
  • Abstract It can be a real challenge to construct the ambient noise modeling among the harbors of very frequent shipping. Therefore, in these harbors, a great amount of resource has to be utilized for precisely control the ambient noise occurring parameters. In this study, the underwater measuring skill is adapted to collect the ambient noise raw data among the first harbor area of Kaohsiung Harbor and the sound intensity of various ships as well. Besides, the signal processing skill is also conducted for ship tracing experiment.
    The harbor ambient noise mainly comes from ships. Thus, the understanding of ship activity and their different sound intensity can be a great help to construct the ambient noise modeling. The results of this study indicate´╝ÜShips outside the harbor create more low-frequency noise than those inside the harbor.Waves inside the harbor create more middle-frequency noise than those outside the harbor.In the harbor, those ships with onboard electricity create more noise and there is less noise around the wharfs without any ships.
    In the part of ship noise study, the intensity is usually correlated with ship types, displacement, ship speed, primary engine and auxiliary engine, etc. However, only two ship types, small and large ships, are categorized in this study. Small ships can be operated easily with the most power outcome, which can create the sound intensity of 155 to 165 dB in average. On the contrary, large ships are usually limited within their operating range and can not move with the most power outcome under the security consideration. Therefore, the sound intensity of large ships is measured between 169 to 177 dB. In the ship tracing experiment, operations are the basis for constructing the harbor ambient noise model.
    Advisory Committee
  • Bin-Bing Ma - chair
  • Chen-Fen Huang - co-chair
  • Jin-Yuan Liu - advisor
  • Files
  • etd-0904107-105146.pdf
  • indicate access worldwide
    Date of Submission 2007-09-04

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