127 OA機器冷却系の低騒音化 : 音響透過ダクトの活用(振動・騒音の制御技術,騒音・振動改善技術)

概要

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In this paper, a silencing unit was developed for reducing noise radiated from the cooling systems of OA-equipments or measuring instruments. It was proved by model experiments that a silencing rectangular bend with rather thin sound absorbing material for high frequency and acoustically transparent walls for low frequency is compact and has high noise reducing performance. They can reduce the radiate noise by about 7dB in the studied example. The noise reducing mechanism of acoustically transparent walls is considered to be that the acoustic energy radiated into a silencing rectangular bend and reflected from the duct exit passes through the acoustically transparent walls into a box and dispersed and absorbed by some electrical plates in the box.
2005-07-06