Strength Analysis Of 70% Low-floor Light Rail Vehicle's Body And Prediction Of Interior Noise

Light rail vehicle (light railway which the distance between vehicle floor and orbital plane is less than 400 mm) is widely used in foreign countries for low manufacturing costs, low energy consumption and facility of get on and off, therefore, the development in China is still in initial stage. This paper focuses on static strength analysis, fatigue strength analysis and interior noise prediction of 70% low-floor light rail vehicle. The main contents are as follows:Firstly, finite element model of block trains has been built based upon geometric model and connection relationship of 70% low-floor light rail vehicle; evaluation of static strength is accomplished by obtain Von.Mises stress contours of car body under six load cases which offered by EN 12663 standard and design task.Secondly, fatigue analysis of the block trains under two kinds of load case which offered by EN 12663 standard is discussed; evaluation of fatigue strength of the car body has been studied by obtain relatively weak position of fatigue strength under vertical and lateral fatigue loading based on nominal stress method and BE standard.Then, finite element model and boundary element model of the light rail vehicle using for vibration analysis and acoustic response analysis have been established based on finite element method and boundary element method; frequency response of car body under unite exciting force has been studied to be use as boundary condition of interior noise analysis; sound pressure level distributions of interior test points and field planes which set by GB/T 12816-91 and design task are researched; acoustic contribution of car body at low frequency is discussed on the base of acoustic transfer vector.Finally, SEA model has been established based on statistical energy analysis method; sound pressure level distribution of interior sound field at wheel-rail and air-condition excitation radiation is discussed; parts with larger contribution to interior noise in high frequency bound have been determined by velocity response analysis of plane subsystem.