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1、哈爾濱工程大學碩士學位論文摘要結(jié)構(gòu)流固耦合輻射聲場問題涉及多個學科，長期以來一直是結(jié)構(gòu)聲分析和控制領(lǐng)域的前沿性問題。雙層圓柱殼體是工程領(lǐng)域中普遍應用的基本構(gòu)件，研究此類殼體結(jié)構(gòu)水下聲—振特性，對工程結(jié)構(gòu)的噪聲控制和優(yōu)化設(shè)計等都具有重要的理論價值和現(xiàn)實意義。水中彈性結(jié)構(gòu)聲一振特性分析的數(shù)值方法具有適應各種復雜模型的優(yōu)點。本文利用有限元加邊界元方法計算了兩端帶固定障板的雙層帶肋圓柱殼體模型的聲—振特性參數(shù)。通過分類對比各工況模型聲—振參數(shù)的特征，得到了該模型受激水下聲—振特性隨內(nèi)殼厚度、肋厚度、殼間介質(zhì)是否連續(xù)、肋的數(shù)量等因素變化的規(guī)律。其中殼間充
2、水有肋、殼問充水無肋、殼間水層有空氣層且有肋三種工況的振動與聲輻射特性表明：低頻范圍內(nèi)模型主要是通過殼間水層傳遞能量的；隨著頻率的增加，肋的能量傳遞作用增強。減振降噪在低頻時是比較困難的。本文的研究結(jié)果表明在低頻時只要把水的傳遞能量作用抑制就能有效地降低結(jié)構(gòu)的輻射噪聲。本文對今后工程中具有類似殼體結(jié)構(gòu)的設(shè)備或部件的低噪聲優(yōu)化設(shè)計以及噪聲控制提供一定的理論依據(jù)。關(guān)鍵詞：有限元；邊界元：雙層圓柱殼；聲輻射哈爾濱工程大學碩士學位論文ABSTRACTTheproblemofsoundradiationfromshellsoffluid-structur
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