PAPERS |
Yasuo ZENDA Shinichiro TANAKA Kiyoshi NAGAKURA
Takanori OBARA Kiyoshi SATOU Hideki MINAMI
The noise of narrow-gauge lines is composed of rolling noise and traction motor cooling fan noise. We measured the noise by using a one-dimensional horizontal microphone array and an acoustic mirror microphone. The conclusions obtained for rolling noise from the measured results are that@(a) the spectrum of rolling noise depends on that of rail and wheel roughness; (b) the sound power generated by a wheel with a doubly curved web is greater than that generated by a disc wheel with a singly curved web; and@(c) the noise in the frequency range 1 to 2kHz is mainly due to the wheel vibration generated by the radial directional force at the rail/wheel contact point.
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