544 新幹線レール頭頂面凹凸とその形成機構解析

概要

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The railhead irregularities are investigated over the whole line of Tokaido-SHINKANSEN. The spectra of them almost always show sharp peaks at some discrete wave numbers such as about 0.4,0.55,0.65,0.8,0.95,1.2 and so on. sometimes the spectra have other peaks in rather higher wave numbers of 3,6,9,12 and so on. The mechanism of rail corrugation is analyzed by a mathematical model in which rail is represented as an infinite beam and a row of wheels travel along it. The contact forces, the growing rate of corrugation amplitude and the spectra of irregularities are calculated. At lower wave numbers, it is found that the peaks of spectra calculated by the theory shows good agreement with those of the real line corrugation. It is considered that the deformation waves of rail excited by plural wheels make the interference each other and under some conditions rail shows smaller elasticity at the excited points. This interference is considered as a basic cause of corrugation in rather low numbers.
一般社団法人日本機械学会の論文
2000-09-01