CAJ | 학술논문

舰船声呐罩以及舱室、车厢等常见的非规则声腔受湍流边界层脉动压力随机面激励产生的水（气）动力噪声，已经或将成为声呐自噪声和舱室噪声的主要成因。文中以一个非规则形状的三维声腔为例，考虑声腔结构振动与内外声场的耦合，采用虚拟膜技术和集成模态法以及功率谱密度概念，建立了声腔受湍流边界层脉动压力随机面激励的自噪声计算模型和方法。数值计算分析表明：虚拟膜技术和集成模态法可用于舰船声呐罩以及列车和汽车车厢等非规则声腔自噪声计算的声学建模，预报声腔内部水动力噪声或气动力噪声的低中频分量，具有数值方法能够模拟复杂形状声腔和解析方法相应的声振耦合方程维数少的优点。
함선성눌조이급창실、차상등상견적비규칙성강수단류변계층맥동압력수궤면격려산생적수（기）동력조성，이경혹장성위성눌자조성화창실조성적주요성인。문중이일개비규칙형상적삼유성강위례，고필성강결구진동여내외성장적우합，채용허의막기술화집성모태법이급공솔보밀도개념，건립료성강수단류변계층맥동압력수궤면격려적자조성계산모형화방법。수치계산분석표명：허의막기술화집성모태법가용우함선성눌조이급열차화기차차상등비규칙성강자조성계산적성학건모，예보성강내부수동력조성혹기동력조성적저중빈분량，구유수치방법능구모의복잡형상성강화해석방법상응적성진우합방정유수소적우점。
The hydrodynamic (aerodynamic) noise, which is induced by random pressure fluctuation be-neath the turbulence boundary layer, has been becoming the main contribution to self-noise of those cavi-ties such as sonar self-noise and cabin noise. In this paper, to analyze the sound field in those cavities which are excited by the random pressure fluctuation on the flexible surface, the virtual elastic membrane technique and modal analysis method are adopted, the coupling effect of the structural vibration and the in-terior and exterior acoustic field is considered, the integral-modal analysis approach is used, and the power spectrum density and coupling impedance of the acoustic modes produced by the non-orthogonal interface are deduced. By all of these, the mathematical physical model is established and the hydrodynamic noise of a sonar dome is numerically computed. And the numerical analysis results show that the virtual elastic membrane technique and the integral-modal analysis approach can be effectively used to predict the sound field in varied irregular acoustic cavity in low and middle frequency range. This method has the ad-vantages of the numerical method, which can simulate the complicated acoustic cavity and the less dimen-sion of the analytical method of corresponding acoustic coupling equation.