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研究生:陳炳旭
研究生(外文):Chen, Ping-Hsu
論文名稱:機械引致船舶結構噪音之抑制參數探討
論文名稱(外文):Parameter Analysis on Structure-borne Noise Reduction Induced by Machinery
指導教授:王偉輝王偉輝引用關係
指導教授(外文):Wei-Hui Wang
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:造船工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:125
中文關鍵詞:結構噪音彈性墊動性水效應四端參數
外文關鍵詞:Structure-borne noisemountmobilitywater effectfour-pole parameter
相關次數:
  • 被引用被引用:11
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  • 收藏至我的研究室書目清單書目收藏:1
為有效抑制船舶結構噪音之傳遞,在本論文中針對四項重要參數加以探討
。分別為彈性墊、阻尼制振複合材料、分支結構以及水效應。 針
對彈性墊部分,以實驗量得動性頻譜,配合四端參數之動性理論來預估。
文中並搭配使用不同材料、厚度之橡膠墊片,研究比較其減振隔噪效果。
分支結構之削音效果可由板的應力波理論推得理論解,然後以有限元素法
分析比較。 文中為了解決有限元素法在分析振動噪音問題時元素
大小的限制,推導出應力波在板與樑中運動的有限元素動性矩陣型式,運
用有限元素理論,編撰一有限元素動性分析程式,並比較其理論解。
由實驗與分析結果發現,彈性墊之減振效果在20~40dB不等,加上阻尼制
振材料可再多隔振5dB,分支結構可減少3~5dB,而水的效應會使得彈性墊
效果減低,約只有10~25dB的隔振效果。 由本論文之結果可證實
,運用四端參數動性理論預估船體結構噪音之傳遞功率是準確可行的。
Four important measures has been discussed for effectively
reducing the transmission of structure-borne noise onboard ships
in this thesis. They are the utilization of resilient mounts,
viscoelastic damping material, branch structure and fluid
radiation damping. The effectiveness of resilient mount
for the isolation of vibration and noise can be evaluated by the
four-pole parameters theory combining with the measurement of
mobility spectra. The effects of different kinds of
antivibration rubber in a sleeve type of resilient mount were
studied analytically and experimentally in this paper.
Noise attenuation effects of branch structure is analyzed by
elastic wave approach and compared the result with that by the
finite element method. In the elastic wave approach, the element
mobility matrices of finite beam and rectangular plate have been
derived. This approach has the advantage to reduce the number of
degrees of freedom in the analysis, especially in the higher
frequency range of structure-borne noise transmission.From the
results by analysis and measurement of a model structure, it has
been shown that the vibration reduction is 20~40 dB via the
mounts. Around more 5 dB reduction can be got by using the CFRP
damping strips. For branch structure of the case of two plates
joined in right angle, it can be able to make a 3~5 dB radiated
noise reduction. The radiation damping effect due to water which
contacting the structure can reduce 5~30 dB noise transmission
in structure. Contrarily, the contacted water has an adverse
effect to reduce the isolation effectiveness of the resilient
mounts. By experiment validation, the four-pole
parameters method can be used to predict the structure-borne
noise transmission of power flow.
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