Prediction of interior lowfrequency structure noise characteristics of aluminum alloy metro vehicle
1.Institute of Vibration and Noise, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Department of Vehicle Engineering, Nanjing Institute of Technology, Nanjing, Jiangsu 211167, China; 3.Technology Department, Nanjing SR Puzhen Rail Transport Limited Liability Company, Nanjing, Jiangsu 210031, China
Abstract：To analysis the interior low-frequency structural noise caused by car body panels vibration from track irregularities, the finite element model of aluminum alloy metro vehicle car body and the sound field boundary element model of car interior space were established. The dynamic analysis was performed based on the proposed models of vehicletrack coupled dynamic system.According to the dynamic loads on involved positions of body structure and the finite element harmonic response analysis method in ANSYS software, the vehicle structure body vibration responses under random irregular rail-track actuations were achieved. The vehicle body structure vibration responses were transfered as boundary conditions to the boundary element model of car interior sound field in SYSNOISE software. The interior sound field characteristics were predicted in the range of 0-200 Hz at different inside place of car. The results indicate that the maximum inner sound pressure level is more than 75 dB.The interior lowfrequency structural noise characteristics in car body of aluminum alloy metro is influenced directly by car body structure characteristics and actuating loads.The interior structural noise can be reduced by decreasing rail-track actuations or optimizing vehicle body structure.
2012, Vol. 33 
