本文選題：頻散 + 淺海　； 參考：《廈門大學》2014年碩士論文

【摘要】：指向性聲源在水聲工程中被大量使用,如圓柱形換能器作為發(fā)射機被廣泛應用于水聲通訊系統(tǒng),故對海下指向性聲源瞬態(tài)輻射聲場作深入研究非常必要。然而,長期以來,關于水下聲源輻射聲場的研究多集中于無指向性點源所輻射聲場,而關于水下指向性聲源瞬態(tài)輻射聲場的研究較為匱乏。本文將圍繞淺海水下圓柱殼式換能器瞬態(tài)輻射聲場展開研究。 由于獲得一些常用水下指向性聲源的勢函數并非易事,故本文在研究水下圓柱殼形換能器瞬態(tài)輻射聲場時,采用瞬態(tài)矢量位移波動方程,而非瞬態(tài)聲壓波動方程。在此基礎上,首先,導出均勻淺海中簡諧波頻散方程,通過數值計算對不同深度淺海中導波頻散特性進行分析；然后,利用本征函數展開法(簡正波法)導出均勻淺海中圓柱殼形換能器瞬態(tài)輻射聲壓解析解,進一步,通過數值計算得到圓柱殼形換能器瞬態(tài)輻射聲場幅度的空間分布,以及瞬態(tài)徑向位移,瞬態(tài)軸向位移和瞬態(tài)聲壓的時域波形。最后,導出分層淺海中簡諧波頻散方程,并進行求解,此外,導出了分層淺海中圓柱殼形換能器瞬態(tài)輻射聲場解析解。 本文創(chuàng)新點在于采用本征函數展開法(簡正波法)對瞬態(tài)矢量位移波動方程進行求解,導出了形式簡潔,物理概念清晰的水下圓柱殼形換能器瞬態(tài)輻射聲場解析解。論文研究成果對水聲通訊等實際應用具有一定的理論參考價值。
[Abstract]:Directional sound sources are widely used in underwater acoustic engineering, such as cylindrical transducers, which are widely used in underwater acoustic communication systems. However, for a long time, the research on the acoustic field of underwater acoustic source is mostly focused on the acoustic field radiated by the point source without directivity, but the research on the transient radiation field of the underwater directional sound source is relatively scarce. In this paper, the transient radiation sound field of underwater cylindrical shell transducers in shallow water is studied. Since it is not easy to obtain the potential functions of some commonly used underwater directional sound sources, the transient vector displacement wave equation, rather than the transient acoustic pressure wave equation, is used to study the transient radiation sound field of underwater cylindrical shell transducer in this paper. On this basis, first of all, the simple harmonic dispersion equation in homogeneous shallow water is derived, and the dispersion characteristics of guided waves in shallow water with different depths are analyzed by numerical calculation. By using the eigenfunction expansion method (the normal wave method), the analytical solution of the transient radiation sound pressure of the cylindrical shell transducer in the shallow water is derived. Furthermore, the spatial distribution of the amplitude of the transient radiation sound field of the cylindrical shell transducer is obtained by numerical calculation. And transient radial displacement, transient axial displacement and transient acoustic pressure in time domain waveform. Finally, a simple harmonic dispersion equation in a stratified shallow sea is derived and solved. In addition, an analytical solution to the transient radiation sound field of a cylindrical shell transducer in a stratified shallow water is derived. The innovation of this paper lies in the solution of the transient vector displacement wave equation by using the eigenfunction expansion method (the normal wave method), and the analytical solution of the transient radiation sound field of the underwater cylindrical shell transducer is derived, which is simple in form and clear in physical concept. The research results of this paper have certain theoretical reference value for practical applications such as underwater acoustic communication.
【學位授予單位】：廈門大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P733.2

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