Research On Hydrodynamic Noise Of Sonar Plate

Hydrodynamic noise is one of the main noise source of sonar dome.On high aquatic-speed and mid-high frequency,hydrodynamic noise is more obvious.With the appearance of more effective control on mechanical noise and high-speed navigation body,reducing hydrodynamic noise inside sonar effectively has important meaning on increasing work efficiency of sonar.Thus,how to decrease hydrodynamic noise inside sonar has become popular subject on vibration and noise control about sonar plate.Based on this,this paper selected the model of bulbous bow's sonar dome as the research object,a complex numerical model was established,which is composed of many kinds of software used for calculating fluid data and acoustic data,LES,Lighthill acoustic analogy theory,structural FEM and IEM.Then,hydrodynamic noise inside sonar dome of bulbous bow was numerical calculated,based on which the analysis of hydrodynamic noise inside sonar dome has been carried out for several cases,including three different kinds of materials of sonar dome,single and double layer sonar domes.To verify the precision of numerical calculation,the experiment on hydrodynamic noise inner a sonar dome model of bulbous bow was carried out in the gravitational water tunnel of underwater acoustic technique laboratory,in which a corrected reverberation measuring method is used.The experiment result coincides well with the simulation solution.