Study On Sound Field Time Division Simulation Mathod Of Noise In High-Speed Train Coach

Recent years in our country, the high speed railway enjoys rapid development, which not only providing us with enormous convenience, but also promoting our county’s economy. It is expected that by the year of2020, China’s high-speed railway operation mileage will reach18000km, which revealing promising high speed railway market. However, the high-speed vehicles, in contrast with low speed vehicles, have faster running speed, more vibration and stinger air flows. As a result, the noise from mechanical vibration and air flow are strengthening. Therefore, railway research institutions and scientific research personnel highly value to how the noise will take effect on the comfort of passengers. One of the key step is the simulation technology, which used to realize the play of synthetic noise and field noise.The paper states high speed train passenger room sound field time division stimulation research approach based on research of noise in high speed train passenger room. In accordance with the characteristics acoustic wave propagation and the theory of noise testing, the experiment proposes the research method and technical route of the sound pressure level calibration. According to calibration, with one-third times frequency octave center frequency point as the base, the simple tone sweep frequency is done. Through sweep frequency, the experiment can value the noise loss in one-third times frequency octave center frequency point. Furthermore, through the loss transfer function, the test point noise loss in the whole frequency can be simulated, and by interpolation, noise loss of any point in frequency can be found. With the loss transfer function, setting revised calibration in actual measurement full frequency correction, it will get revised noise data in said point. By the same process, the revised data of other points can be respectively valued, and finally the whole time division simulation is completed.This test method is a innovation in noise experimental simulation. It provides test support for further research on high-speed train noise in laboratory simulation and on generalized comfort research.