著者
上松 一雄 森 秀隆 間瀬 正隆
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.31, no.11, pp.808-816, 1996-11-01 (Released:2010-12-08)
参考文献数
7

Mitsubishi Heavy Industies, Ltd. developed high-efficient, high-reliable and compact, ‘Marine Gas Turbine MFT 8’ for Goverment sponsored project ‘Techno Super Liner’ which is getting much attention as Marine Super Express. As a result we succeeded Sea Trial in '94 and real transportation test including night operation in '95 by using a experimental ship ‘TSL-A70’ which were developed by Mitsubishi and Mitsui. This paper reports these results and the future of Marine Gas Turbine.
著者
米澤 徹 大久保 稔 石田 慎一郎 苅田 広
出版者
公益社団法人 日本マリンエンジニアリング学会
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.35, no.5, pp.309-317, 2000-05-01 (Released:2010-05-31)
参考文献数
7

In recent years, the demand for reduction of noise emitted into the environment has strongly increased for preventing noise pollution. For example, the ships, which have high noise levels, are refused entry to ports at night. As the major contributor of emitted noise to the environment is exhaust noise, it is necessary to reduce the exhaust noise as much as possible.Conventionally, such as passive silencer technique, a larger silencer is needed in order to achieve larger noise reduction. Therefore, because of the limitation of space, it was actually difficult to reduce the exhaust noise of the ship.For reducing the exhaust noise as well as minimizing the occupied space, the active noise cancellation technique was applied to the exhaust noise silencer for a diesel engine. In order to reduce the exhaust noise efficiently, at first, the acoustic behavior in an exhaust pipe was calculated by the boundary element method. At first, for optimizing the length of pipes and the positions of microphones and speakers, the active exhaust noise cancellation system (AENC) could be applied to the main engine for marine use. Also, by applying acoustic resonance aggressively, the AENC with only one speaker system could be developed for auxiliary engine.The Filtered-X LMS algorithm with a signal filter was used for adaptive control. Finally, by assembling a passive silencer for high frequency noise, the active exhaust noise silencer was developed. Then the exhaust noise was drastically reduced to less than 65dB (A) at lm from the outlet.