Abstract
The aerodynamic noise generated from bogie sections is one of the main sources of noise when high-speed trains run above 300 km/h. A new wind tunnel test method is proposed herein to determine the sound source distribution in detail and clarify the generation mechanism of the aerodynamic bogie noise in railways. Our wind tunnel test conducted for the latest Shinkansen vehicle indicated that the aerodynamic bogie noise at around 250 Hz to 315 Hz is generated by the cavity structure of the bogie section. Moreover, the noise source at around 400 Hz to 500 Hz is located at the traction motors and a gear unit. Three countermeasures were used herein to control the flow at the upstream of the bogie (i.e., two-dimensional deflector, three-dimensional (3D) deflector, and bottom lowering). Consequently, the aerodynamic bogie noise is properly reduced by the 3D deflector and bottom lowering.
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Sawamura, Y., Uda, T., Kitagawa, T., Yokoyama, H., Iida, A. (2021). Measurement and Reduction of the Aerodynamic Bogie Noise Generated by High-Speed Trains in Terms of Wind Tunnel Testing. In: Degrande, G., et al. Noise and Vibration Mitigation for Rail Transportation Systems. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 150. Springer, Cham. https://doi.org/10.1007/978-3-030-70289-2_5
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DOI: https://doi.org/10.1007/978-3-030-70289-2_5
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