Study On Ship Vibration And Noise Prediction Method Based On Transfer Matrix

For ships and underwater vehicle structures,the vibration and noise level is an important indicator to measure their combat effectiveness and vitality.How to achieve rapid prediction of vibration and noise of ships and underwater vehicle structures has become an urgent problem to be solved in the engineering field;On the other hand,the existing ship and underwater vehicle structure vibration noise simulation assessment has large calculation scale and low solution efficiency,which seriously affects the ship design and construction progress.This paper adopts a combination of theoretical analysis,numerical calculation and model test.The transfer matrix theory establishes the vibration analysis model of ship and underwater vehicle structure and the analysis model of acoustic performance of composite structure,and validates the effectiveness.At the same time,it studies the influence of structural form and other factors on the acoustic performance of ship vibration and composite structures.Developed a rapid forecasting software for ship vibration and cabin noise,and proposed a ship cabin noise protection and protection procedure,which aims to provide reference for the design of ship cabin noise protection and protection.Firstly,the dissertation expounds the method of forecasting the vibration and noise of ships and underwater vehicles.The paper summarizes the advantages and disadvantages of different methods for evaluating vibration and noise of ships and underwater vehicles,and based on the existing analytical methods and numerical forecasting methods.A semi-analytical transfer matrix method was proposed to evaluate the vibration and noise characteristics of ships and underwater vehicles.Secondly,based on the transfer matrix method,this paper establishes the structural vibration analysis model of ship and underwater vehicle,and validates the validity of the model by finite element method.Then based on it,it develops a rapid forecast of vibration characteristics of ship and underwater vehicle structure.The software verifies the rapidity of the analysis model.Finally,taking an underwater vehicle as the research object,the vibration characteristics of the underwater vehicle under different working conditions are analyzed,and the influence of different characteristic parameters on the vibration characteristics of the underwater vehicle structure is further studied.The ship and water can be designed for the design stage.The method for providing vibration and noise forecast of the lower aircraft structure and its data reference.Thirdly,based on the transfer matrix method,an acoustic performance analysis model of composite structure was established,and the validity of the model was verified by the acoustic performance test of the composite structure.At the same time,the influence of different structural forms and parameters on the microscopic acoustical properties of the composite structure was investigated.On this basis,the protective process of cabin noise protection is put forward,and the macro noise reduction effect of the model cabin is analyzed.The research shows that the sound-absorbing and sound-insulating composite structure can increase the noise transmission energy loss,reduce the noise transmission energy,make the cabin noise level significantly improve,and can provide new ideas for solving practical engineering problems.Finally,a rapid forecasting software for ship cabin noise was developed based on statistical energy method.Taking a certain type of patrol boat as an example,the noise characteristics of the entire cabin are analyzed under typical navigation conditions and the design noise of the cabin is determined.On this basis,the acoustic optimization design is applied to cabins and areas with excessive noise.The study proposes a targeted noise protection solution for ship cabin noise,which can provide technical support for noise control of ships and underwater vehicle cabins.