ダクト内回転音響モードの発生・計測システムの開発〔流体工学, 流体機械〕

概要

論文の詳細を見る
The final goal of this research is to establish fundamental technologies for active reduction of fan tones radiated from a turbofan engine. The acoustic system developed comprises a modal detection system, a high-speed signal processing system and a secondary sound source system. The secondary sound source system, which is required for anti-phase acoustic mode generation, is the main topic of this paper. We designed the system to generate and identify arbitrary spinning modes in a duct and examined the performance of the system by conducting experiments. As a result, the system generated spinning modes within the range of 1〜7 lobes. A flush-mounted microphone array could analyze radial modes of higher order as well as circumferential ones with good accuracy. It was clarified that the system can be used as a secondary sound source for the active suppression of fan tones.
一般社団法人日本機械学会の論文
1997-10-25