Investigation On Characteristics Of Stern's Noise And Simulation Of The Propeller's Hydrodynamic Performance

When underwater vehicle is running in the water,the interaction of propeller,shaft,rudder and shell structure will cause stronger underwater noise,which is the key point of the vibration noise.Currently,the research about underwater vehicle noise is more concentrated in the field of flow noise,flow-induced nose and propeller noise.Coupling of shell-shaft-propeller is less studied.Studying on the extracting of propeller force,most of literatures focus uniform loads,lacking distributed loads.Based on the SUBOFF model,this paper establishes a underwater vehicle shell-shaft-propeller coupling model meeting the stability requirements and strength requirements,and establishes its finite element model.Based on CFD,this paper carries out the flow field simulation calculation,extracts the exciting force of the propeller came from the unsteady wake field,as well as explores the propeller hydrodynamic characteristics.And then this paper loads it into the blades in the form of distributed loads,simulated computes the tail shell's coupled vibration and radiated noise caused by the propeller excitation.Through the analysis of cross-section direction of sound pressure level and the sound pressure level of selected reference points to research the underwater sound radiation characteristics.This paper compares the influences of different flow field conditions and structural parameters on propeller excitation force and the resulting underwater sound radiation characteristics.This paper simulates the underwater sound radiation process of underwater vehicle-shaft coupling model under the effect of propeller hydrodynamic,and carries out a variety of comparison between working conditions and models.It provides reference for the further study of vibration and noise reduction and optimization.