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題 名 | 擁有加強樑平板之聲壓輻射分析=Sound Radiation of Rib-stiffened Plates |
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作 者 | 鄭志鈞; 楊宗仁; | 書刊名 | 中國造船暨輪機工程學刊 |
卷 期 | 18:2 1999.05[民88.05] |
頁 次 | 頁57-67 |
分類號 | 444.2 |
關鍵詞 | 加強樑平板; 流體承載; 聲壓; 方向性; Rib-stiffened plates; Fluid-loaded; Sound pressure; Directivity; |
語 文 | 中文(Chinese) |
中文摘要 | 有限加強樑平板( Rib-Stiffened Plates )在考慮流體承載( Fluid-Loading )及加強樑對於平板的抗彎曲及抗扭轉剛性下,發展加強樑平板的振動聲學理論模型。再依 此模型以加強樑的數目、位置、剛性及質量作為主要的設計變數,探討這些設計變數對於遠 場( Far-Field )聲壓輻射的方向性( Directivity )影響。分析結果顯示,流體承載使 得平板的自然頻率降低,但擺設加強樑使得平板的自然頻率升高,而彎曲剛性愈大的加強樑 組改變加強樑擺設位置對於遠場聲壓的變化愈靈敏,此外,改變加強樑的數目及剛性後,加 強樑的彎曲剛性愈大者其遠場聲壓會愈小,而外力頻率的提高使得其輻射遠場聲壓更具方向 性,但彎曲剛性對結構系統的影響會隨著外力頻率的增加而逐漸變小。 |
英文摘要 | Vibro-acoustic response from a finite, fluid-loaded, rib-stiffened plant is studied. The attached stiffeners will be treated as beam structures having arbitrary sizes, number and locations. A systematic method based on combinations of the eigenfunctions of plates and 3-D acoustic Green's functions was developed to formulate the total radiated acoustic power and radiation pattern from a fluid-loaded stiffened plate. The natural frequencies and farfield pressure directivity are calculated in order to gain understanding of the underlying physics and the controlling parameters, such as number of ribs, rib spacing, etc. Results show that the effects of rib stiffness on sound directivity decrease as the excitation frequency increases and the far field pressure is more sensitive to the rib location when the rib stiffness increases. |
本系統中英文摘要資訊取自各篇刊載內容。