Simulation And Prediction Of Interior Noise Of 400 Km/h High Speed Train

With the increase of train operation speed and the requirement of strong quantification,more attention has been paid to the ride comfort of high-speed trains.In order to meet the noise index of a high-speed train running at 400km/h,this paper takes a certain type of high-speed train as the research object,focuses on the analysis of the noise environment of the front car area of the train,establishes the simulation model of the front car of the high-speed train by using the hybrid finite element statistical energy analysis method,and calculates the acoustic parameters of the car under the speed of400km/h by loading excitation,so as to evaluate the interior noise condition,The optimization design is carried out according to the interior noise index,which provides technical support for the design of 400km/h high-speed train.Before the acoustic simulation model is established,the calculation method of coupling loss factor between structures is proposed by using statistical energy analysis method,and the main factors affecting the numerical change of coupling loss factor are analyzed.According to the analysis results,the parameter design of the cab sightseeing area connection structure is adjusted.Combined with the calculation results of the coupling loss factor of the connection structure,the optimal parameter design scheme is selected to improve the noise transmission loss between structures.The optimization results of coupling loss factor are applied to the simulation analysis of the head car,and the influence of weakening the lateral transmission on the interior noise is obtained.The 3D geometric model and the finite element model of the high-speed train head are established in turn,and the auxiliary surface is established to divide the acoustic cavity subsystem of the car body in VA one;The hollow profiles of car body are equivalent to multi-layer plate,and the modal characteristics and sound transmission loss of the equivalent plate are verified by experiments;By applying350 km/h excitation data to the simulation model,the simulation results of vehicle interior noise are obtained,which are compared with the measured data to verify the accuracy of the model;The external vibration noise of the vehicle is recursively obtained under 400km/h operation by using the actual measurement results of the EMU,and the interior noise is calculated by using the statistical analysis model;By comparing the difference between the interior noise and the design standard of the interior noise at the target speed level,the noise reduction method of optimizing the sound insulation of the car body is adopted to improve the noise level.