封闭空腔结构-声耦合场内辐射声粗糙度的研究

Study on Radiating Sound Roughness of Acoustic-Structure Coupling Field in Sealed Cavity

基于结构-声耦合场有限元模型以及改进后的Sethares非谐音心理声学模型,计算封闭空腔边界上声固耦合板受简谐力激励后引起的空腔内部辐射声,分析其在评价点被快速调制时产生的粗糙度,并研究调制音声压级、调制音频率以及耦合板刚度对辐射声粗糙度的影响。为计算封闭空腔内部声辐射被其它声源所快速调制时产生的声粗糙度提供依据和预测方法。

Based on the finite element model of acoustic-structure coupling field in a sealed cavity and the improved Senthares non-harmonic psychoacoustics model, the sound pressure level of the internal radiating sound due to the excitation of the harmonic force exerted on the shell of the cavity is calculated. The acoustic-structure coupling effect is considered. The sound roughness caused by the rapid modulation at the evaluation point is analyzed. Moreover, the effects of the sound pressure level of the modulated sound, the frequency of the modulated sound and the stiffness of the shell on the radiating sound roughness are studied. This Work provides the data and method for determination of the internal radiating sound roughness in the cavity caused by the rapid modulation of the other sound sources.