Research On Interior Noise Control Of High-speed Maglev Train

Maglev train is a new type vehicle which has the advantages of high-speed, little pollution and small energy-consumption. But the high-speed can arouse the air flow, resulting in the bow wave which induces great air-dynamic noise. If the properties of vibration isolation and sound insulation of train body are poor, intense vibration and noise will transfer into the interior which has great effect on the ride comfort. Vibration and noise lead to the early fatigue of some components which decrease the life of train. After all, the research on decreasing the interior noise of maglev train has great significance.Combined with project of national 863 plan for research on interior noise control of high-speed maglev train, the interior noise simulation and control of new type high-speed maglev train TR-SHA are discussed, on basis of comprehensive analysis and experiences of former researchers. This paper mainly includes 4 parts:Firstly, the sound insulation property of plates are researched through experiments and simulation. Using equivalent parametric method to simplify the sandwich plates into homogeneous single layer plate and predicting the sound insulation property of plates, eventually validating the results with experiments ;Secondly, the structure of windows on trains are designed and optimized. Establishing several plans of window structures, computing the sound insulation property combining SEA method and FEM, eventually validating the results with experiments ;Thirdly, developing the floating floors in maglev train and designing the rubber isolators on floating floors. Building the finite element model of rubber isolator, computing the static stiffness, optimizing the section based on requirements, then validating the results with experiments on sample.Eventually, building the element model of train and air cavity, computing the structure and acoustic modes by simulation, analyzing the impact of train with chairs or not on acoustic modes; Based on the former research, setting up the acoustic-structure coupled model, computing the sound field under the outside excitation; analyzing the impact of sound insulation material on the interior noise which has sound insulation material or not and amending the sound pressure error of interior noise resulting from the simplification of insulation material; Optimizing the thickness of damping material on transverse panel to decrease the interior noise through defining the total sound pressure level as objective function and the thickness as design variables.