碩士 / 國立中興大學 / 機械工程學系 / 93 / Abstract
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.
| Identifer | oai:union.ndltd.org:TW/093NCHU0489029 |
| Date | January 2005 |
| Creators | Chih-Wen Cheng, 鄭志文 |
| Contributors | Jung-Yi Lin, 林忠逸 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 101 |
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