To improve the control effect of active muffling control for rotor blade tip noise.SOLUTION: The noise reduction device according to the present embodiment includes speakers, microphones, and a control signal generator. The speakers are disposed around the rotor and emit control sounds on the basis of control signals. Microphones are disposed around the rotor and collects the control sounds and noise emitted from the rotor and converts them into microphone signals. The control signal generation unit generates the control signals for reducing an acoustic power at positions of the microphones on the basis of the microphone signals, a rotational speed of the rotary blade, and phases of the noise arriving at the microphones from the rotary blade.SELECTED DRAWING: Figure 1
【課題】回転翼の翼端騒音に対する能動消音制御の制御効果を向上すること。【解決手段】本実施形態に係る騒音低減装置は、スピーカ、マイクロフォン及び制御信号生成部を有する。スピーカは、回転翼の周囲に配置され、制御信号に基づいて制御音を発する。マイクロフォンは、回転翼の周囲に配置され、制御音と回転翼から発せられる騒音とを収集してマイク信号に変換する。制御信号生成部は、マイク信号と回転翼の回転速度と回転翼からマイクロフォンに到達する騒音の位相とに基づいて、マイクロフォンの位置の音響パワーを低減するための前記制御信号を生成する。【選択図】 図1
NOISE REDUCTION DEVICE, AIRCRAFT, POWER GENERATION DEVICE, NOISE REDUCTION METHOD AND NOISE REDUCTION PROGRAM
騒音低減装置、飛行体、発電装置、騒音低減方法及び騒音低減プログラム
2019-04-04
Patent
Electronic Resource
Japanese
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