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題 名 | Predictions of Ship Structural Vibration Transmission and Radiated Underwater Sound Power at Medium Frequency Ranges=中頻結構振動傳遞及輻射至水中噪音之預估 |
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作 者 | 許榮均; 張建仁; 劉翔偉; | 書刊名 | 中國機械工程學刊 |
卷 期 | 19:5 1998.10[民87.10] |
頁 次 | 頁487-495 |
分類號 | 444.1 |
關鍵詞 | 中頻結構; 振動; 輻射; 水中噪音; Finite element method; Statistical energy analysis; Structural borne sound; Coupling loss factor; |
語 文 | 英文(English) |
中文摘要 | 本研究主要在探討使用能量統計法與有限元素法來計算同主機運轉而傳至船體其 他部位結構的振動及輻射至水中之能量。 有限元素法在本研究中是用來計算統計能量法中 的耦合損失因子,以此來突破統計能量法只能用於高頻之限制。而本文所提的方法可用於頻 率較低的中頻範圍。本研究除了建立理論預估的程式外,並建立一船艙模型進行振動與水中 噪音實驗,來檢驗本文所提理論方法之可行性。 |
英文摘要 | In this paper the Statistical Energy Analysis(SEA) Method and Finite Element Method was used to estimate the amount of vibrational energy generated by the main engine on board ship that is transmitted to the nearby structures and the surrounding water. Finite element method was used to estimate the coupling loss factor between subsystems for use in the SEA model to predict the structural response. The purpose of combining these two methods is to avoid the restriction in using SEA, that is, it can only be used when the modal density is high, i.e., in higher frequency ranges, whereas the combined model applies to medium frequency ranges. A model of an engine room section was built to conduct experiments on vibrational energy transmission into adjacent structures and water. Finally, the results from the experiments and theoretical predictions were compared to check the validity of the proposed theory. |
本系統中英文摘要資訊取自各篇刊載內容。