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題 名 | Marine Diesel Engine Noise Identification by Using Holography Reconstruction=全像投射法在確認船用柴油引擎噪音源之應用 |
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作 者 | 李仁傑; 陳毅聰; | 書刊名 | 中華民國音響學刊 |
卷 期 | 5:1 1998.06[民87.06] |
頁 次 | 頁1-18 |
分類號 | 334.2 |
關鍵詞 | 音源確認; 聲強現場量測; 全像投射; 聲音功率頻譜; Noise identification; Intensity in situ measurements; Holography reconstruction; Sound power spectrum; |
語 文 | 英文(English) |
中文摘要 | 本文以聲強現場量測的全像投射技術,確認船用中速柴油引擎的噪音源及其主要 頻率。噪音源的主要頻率分佈能由擎表面聲音功率頻譜得知,而在某噪音頻率時全像面上的 聲音壓力,則由聲強現場量測所得的主動聲強訂量算出。全像投射技術是由全像面上的聲音 壓力推算出引擎表面聲音壓力分佈,據此確認引擎表面的噪音源。聲強現場量測在定性上符 合四個聲場指標的要求,在定量上則與表面聲強量測結果作比較,顯示聲強現場量測的可靠 性,文中所確認船用中速柴油引擎的噪音源與由聲音功率頻譜分析的結果相同,故聲強現場 量測的全像投射技術能用在確認船用中速柴油引擎的噪音源及其主要頻率。 |
英文摘要 | In this study, the most powerful source and its dominant frequency of marine medium-speed diesel engine can be identified by using holography reconstruction from intensity in situ measurements. The dominant frequency of the most powerful engine noise is found from the peak of engine surface sound power spectrum; the complex pressure of the hologram plane at this dominant frequency can be calculated from the active intensity vector which is given from intensity in situ measurements. The pressure distribution of diesel engine surface, reconstructed by acoustic holography from the complex pressure of the hologram plane, can be used to identify the engine noise sources. The intensity in situ measurements, qualified by four field indexes, are performed at the marine engineering workshop which is used to simulate the complex sound field of engine room. The accuracy of intensity measurements is also checked by comparison with the surface intensity method, and the agreement of these two methods are found. The most powerful noise source of a marine medium-speed diesel engine identified from the holography reconstruction is the same as that from the sound power spectrum analysis. Therefore the moise sources of large marine medium- speed diesel engine can be identified by using holography reconstruction from intensity in situ measurements. |
本系統中英文摘要資訊取自各篇刊載內容。