Radiation Sound Field Performance in Finite Length Cylindrical Shell by Active Point Excitation

Radiation sound field performance of single-point and multi-point excitation on finite length cylindrical shell is studied theoretically.Donnell shell theory and modal analysis method are used to establish mathematical models of single-point and multi-point excitation on finite length cylindrical shell of sound radiation.Calculation and analysis of low frequency sound radiation characteristics of near-field and far-field on the single-point and multi-point excitation cylindrical shell are based on sound radiation mathematical model.Results show that with the increasing of the excitation force frequency,sound radiation power and efficiency of cylindrical shell increase,radiation sound pressure enhances,and the direction of sound energy radiation is same as excitation force acting direction;at the near-field,the sound pressure attenuates quickly as the frequency falls and has certain fluctuation characteristics;at the far-field,the rules of sound pressure changing are different on different radiation directions,and the attenuation of sound pressure are approximate to spherical wave attenuation.