Technique Research Of Vibration And Noise Reduction On Metro Car

Subway transportation have some advantages of great transportation capacity, rapid running speed, good properties of running controllability and reliability. And subway can make double use of urban road area, promote the city's property development and reduce air pollution. With high speed developing of railcar industry, more and more cities start building subway transportation.However, on the other hand, the noise in metro car also attracted attention. Vehicle noise not only seriously affect the comfort of passengers, but also can bring parts fatigue damage of railway vehicle in early stage. So it reduce the service life of railway vehicle and restrict the development of railway traffic to a certain extent.In order to get vibration value and the rule of sound field distribution in metro car, and do study on vibration and noise reduction to it, this paper mainly aims at following aspects:Firstly, on different running speed, according to some standards in and abroad, used HEAD acoustics noise and vibration test and analysis system, did points distribution and did a test in the metro car.Through noise and vibration spectrum analysis, get sound pressure level and vibration accelerations of every test point on different frequencies. Through the analysis, educed the main noise sources in the metro car consist of wheel-rail noise, air conditioning unit noise, windshield and electrical equipments noise. the vibration condition in the metro as follows:the vibration acceleration of the floor surface on bogie and in the car central are the biggest, mainly are medium and low frequency; the next are the vibration accelerations of air conditioning unit, mainly are medium and high frequency; the vibration at side walls are the minimum, mainly are medium and low frequency.Base on the analysis, take some vibration and noise reduction measures to air condition units, side walls and floor as follows:Adding super absorbing glass cotton at air condition units; coating damping material on side walls; pasting damping material on floor,aim to reduce noise and vibration.Lastly, by using ANSYS finite element software, do analysis to the improved floor, show that method is feasible.