A224 円柱から発生するエオルス音の特性

概要

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The Aeolian tone generated from circular cylinders has been studied widely since Strouhal's well known experiment. The subject revived for the control of pantograph noise for high-speed trains in last 10 years. The author and his colleagues have performed experimental studies of the generation mechanism and control of the Aeolian tone. The Strouhal number, the peak levels of the Aeolian tone and the surface pressure fluctuations were measured simultaneously for the wide range of the Reynolds number between 5×10^3 and 2×10^6,covering sub-critical, super-critical and trans-critical ranges. The Strouhal number jumped up to 0.45 and the Aeolian tone sharply decreased in the super-critical Reynolds number range. The Aeolian tone peak level was predicted using Curle's theory from the measured surface pressure fluctuation, resulted in fair agreement with the measured peak level.
2000-07-25