| dc.description.abstract | The high-speed carriage noise is not only effected by the car body, aerodynamic, pantograph, rail/wheel interaction, track form and civil structure etc., but the factor of vehicle interior noise (i.e. train speed, structure type gradients, radius and driving characteristics) is also very important. The change of noise within the carriage is the key in this paper.
This paper is based on noise literature from home and abroad, and measurement standards and methods (i.e. ISO 3381, JIS E 4021). The internal noise monitoring of the carriage of the 700T train was carried out using three pairs of cars, each consisting of a power car and a non-power car. The differences of status and change were observed when the train passes by different structures.
Because of the different factors of train speed, carriage location and structure form, the carriage noise value can change randomly, so the different sound levels will appear in the individual carriage, carriage location and structure form. The study results have shown the maximal difference of noise appeared in tunnel sections (longer tunnel sections were louder than short tunnel sections). Second highest are viaduct sections and cut/embankment sections. The minimal value is the mechanical sound when the train is approaching a station or stop. In general, the obvious differences appear when the train speed is 250KM/h or higher. At 250KM/h and above the noise value is up to 70-71dB. The noise value is 68-69dB when the speed is lower than 250KM/h. In addition, the maximal noise difference appeared in the 4th power carriage (located below the pantograph), the non-power car is second and the power business car is minimal value. At last, the noise value of the seats located in both sides of the carriage nearby the door is greater than the seats located in center section of the same train. | en_US |