Abstract
It is important to reduce a noise along railway lines not only for high-speed Shinkansen (220-300km/h) but also conventional railways (below 160km/h). The noise of the narrow-gauge lines is composed of rolling noise and traction motor cooling fan noise. This paper describes the effect of wheel shape on rolling noise. We measured the noise by using a one-dimensional horizontal microphone array and did impact testing of Type NA wheel with a doubly curved web. The noise of Type NA wheel with a doubly curved wheel is larger than that of Type A wheel with a curved wheel at about l,250Hz and l,900Hz. The results of wheel characterization measurement by using an impulse hammer show that the rim of Type NA wheel vibrates radially with two nodal diameters with the web vibrating axially at l,250Hz.
