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標題: 拖船機艙噪音頻譜分析及局部空間消音控制
Noise Spectrums Analysis and Local Space Noise Reduction in Tug Engine Room
作者: 鄭志文
Cheng, Chih-Wen
關鍵字: Tug''s Noise;拖船噪音;Active Noise;Passive Noise;被動式消音;主動式消音
出版社: 機械工程學系
摘 要

This study investigates spectrums distribution of noise generated from various devices in engine room of a tug. By understanding the spectrums distribution of the individual noise devices, we can get some guidelines for devices selection. If possible, devices are selected for insensitive ears that can reduce the noise in the engine room. This study also examines methods including passive and active ways to reduce the noise level for commutation at a certain location in the engine room. A septum booth is built to create a local space for communication in the engine room for experiments. It is found that passive materials can effectively eliminate the noise at high frequencies but have less or no effect at low frequencies. Active noise control (ANC) is then designed and applied to attenuate the noise level at low frequencies. Experiments show that the ANC can further reduce the noise level in the septum booth, demonstrating the effectiveness of the combined passive and active approach.
Appears in Collections:機械工程學系所

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