Abstract
With higher train speeds and less traditional methods of vehicle construction, forecasting of any internal sound field deterioration is important. This investigation has shown that identification of components of internal noise in a vehicle is possible. As operating speeds increase, it is also necessary to take into account turbulent boundary- layer noise. The sound field around a vehicle resulting from the wheel-rail noise alone can be calculated reasonably accurately from a model, and this should remain useful unless a major change in cross-section of a passenger vehicle is proposed.
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