Measurement of small vessel machinery vibration induced acoustic signature levels

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2019-12-26 DOI:10.3329/jname.v16i2.42030

G. P. Kumar, V. Prasad, B. H. Nagesh

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引用次数: 1

Abstract

Abstract: Ship vibrations, airborne and underwater noise levels have always been a challenging topic from performance point of view in ship design, building and operation. The measurement shall help in monitoring the self-noise and the technical state of their machinery mechanism. The vibration levels of the main engine and auxiliary Genset foundation, airborne noise levels of the engine room and underwater self-noise levels of a small mechanized fishing trawler was measured at the jetty in idling condition. The vibration levels on the foundation measured an average value of 0.207 mm/s for main engine and 1.36 mm/s for auxiliary Genset. The airborne noise levels measured 99 dB (A) in the engine room. The peak underwater sound pressure levels measured 162 dB re 1μPa. The response spectra indicate the peak vibration and noise levels in the lower frequency region <1.2 kHz. The machinery excitation forces transferred to the hull surface as pressure fluctuations which generated the airborne and underwater noise levels. Though the measurement limited to jetty conditions, detailed analysis can be useful for detection, classification and tracking of small vessels.

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小型船舶机械振动诱发声特征级的测量

摘要：从性能的角度来看，在船舶设计、建造和运行中，船舶振动、空气和水下噪声水平一直是一个具有挑战性的话题。测量应有助于监测自身噪声及其机械机构的技术状态。在码头空载条件下，测量了一艘小型机械化拖网渔船主机和辅助发电机组基础的振动水平、机舱的空气噪声水平和水下自噪声水平。基础上的振动水平测得的平均值为0.207 mm/s（主机）和1.36 mm/s（辅助发电机组）。机舱内测得的空气噪声级为99 dB（A）。水下声压峰值测量值为162 dB re 1μPa。响应谱表示在<1.2kHz的低频区域内的峰值振动和噪声水平。机械激振力作为压力波动传递到船体表面，从而产生空气和水下噪声水平。尽管测量仅限于码头条件，但详细分析可用于小型船只的检测、分类和跟踪。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.