By H. Kanda, H. Tsuda, K. Ichikawa, S. Yoshida (auth.), Burkhard Schulte-Werning, David Thompson, Pierre-Etienne Gautier, Carl Hanson, Brian Hemsworth, James Nelson, Tatsuo Maeda, Paul de Vos (eds.)

This quantity comprises the contributions to the 9th overseas Workshop on Railway Noise, held Sept 04-08, 2007, in Munich, Germany. The workshop featured lectures by means of overseas leaders within the box of railway noise and vibration.

All matters when it comes to railway noise as noise assets (rolling noise, aerodynamic noise, bridge noise, sonic boom), prediction instruments and theoretical versions, new noise relief, expertise in addition to ground-borne vibration are tackled.

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The accuracy of source localization using the near-flow microphone array is improved to a location error of better than 10 mm, which is suitable for narrow areas such as the gap sections of a scaled train model. 1 Experimental Method We investigated the noise characteristics of the gap sections using a 1/8-scale train model. Figure 2 shows the experimental set-up of the train model and microphones. 2 (a). The A-weighted sound pressure level (the noise level) was also measured using an omni-directional microphone.

The amount of noise reduction level obtained using this technique was estimated approximately as 6 to 7 dB. Finally, we verified the effect of noise reduction technique for the gap section in the field tests qualitatively. : Study on Optimization of Panhead Shape Possessing Low Noise and Stable Aerodynamic Characteristics. : Method of analyzing the Wind Tunnel Test data measured with directional microphone systems. : Acoustic Source Localization of Pantograph Using a 2-D Microphone Array (in Japanese).

Five seismic cone penetration tests (SCPT) and two spectral analysis of surface wave (SASW) tests have been performed to determine the soil layering and the small strain dynamic soil characteristics. 0 m and a shear wave velocity of 150 m/s on top of a halfspace with a shear wave velocity of 280 m/s. The results of the SCPT tests confirm these observations. 03 for the material damping ratio β of all soil layers in deviatoric and volumetric deformation. A value of 1/3 has been assumed for the Poisson’s ratio and a density ρ equal to 2000 kg/m3 .

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