石英系光ファイバ素線紡糸過程における素線外径変動の摂動解法による数値計算(機械力学,計測,自動制御)

概要

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One-dimensional numerical model of optical fiber drawing to predict diameter fluctuation caused by periodical fluctuation of heat transfer between silica glass preform and furnace gas, has been developed by using perturbation method based on steady solution. It is assumed that heat transfer coefficient is fluctuating in neck-down region and its frequency range is 0.001〜100 Hz. As a result, it is revealed that relationship between fluctuation of heat transfer coefficient and that of diameter can be divided into three modes by the order of diameter gradient and velocity gradient at heat transfer fluctuating point. The diameter fluctuation of first mode is large in low frequency range and that of third mode is so in high frequency range. As drawing velocity become higher, the fluctuation of third mode becomes larger, because velocity gradient becomes higher. And as heater becomes longer, the region of second mode becomes wider, because velocity gradient of heater region decreases.
一般社団法人日本機械学会の論文
2003-09-25