螺旋桨空化对噪声调制特征影响研究
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摘要
针对螺旋桨空化特征的识别问题,采集某试验船在不同转速下的螺旋桨噪声信号,运用小波包原理重构出表征空化的特征信号,提取不同空化状态下的特征信号包络,对比分析特征信号包络时域和频域特性变化,得到空化发展对信号调制特征的影响规律。结果表明:空化初期调制谱的结构出现变化,同时在一定范围内空化特征信号的调制程度随着空化发展而加深。
Aiming at the problem of propeller cavitation detection, propeller noise with different rotate speeds of a trial ship is collected and characteristic signals representing propeller cavitation states are refined from the noise using wavelet packet reconstruction. Envelop of characteristic signals during different cavitation development stages are demodulated and envelop features of time domain and frequency domain are analyzed. The result shows that structure of the characteristic signal's envelop spectrum is changed during initial stage of cavitation, and the degree of demodulation is deepened with cavitation aggravating.
Aiming at the problem of propeller cavitation detection, propeller noise with different rotate speeds of a trial ship is collected and characteristic signals representing propeller cavitation states are refined from the noise using wavelet packet reconstruction. Envelop of characteristic signals during different cavitation development stages are demodulated and envelop features of time domain and frequency domain are analyzed. The result shows that structure of the characteristic signal's envelop spectrum is changed during initial stage of cavitation, and the degree of demodulation is deepened with cavitation aggravating.
引文
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[2]LOURENS J G.Classification of ships using underwater radiated noise[J].Proceedings of IEEE Communications and Signal Processing,1988:130-134.
[3]陶笃纯.舰船噪声节奏的研究(Ⅰ)--数学模型及功率谱密度[J].声学学报,1983(2):65-76.TAO Du-chun.A study on ship radiated noise rhythms(I)--Mathenatical model and power spectrum densidy[J].Acta Acustica,1983(2):65-76.
[4]邱家兴,程玉胜,刘启军,等.船舶大侧斜螺旋桨空化噪声调制谱谐波结构[J].声学技术,2015(4):364-368.QIU Jia-xing,CHENG Yu-sheng,LIU Qi-jun,et al.Demodulation spectrum harmonic line structure of highskewed propeller cavitation noise[J].Technical Acoustics,2015(4):364-368.
[5]史广智,胡均川.舰船噪声调制谱谐波族结构特性理论分析[J].声学学报,2007(1):19-25.SHI Guang-zhi,HU Jun-chuan.Theoretical analysis of the structure law of ship radiated-noise demodulation spectrum harmonic clan feature[J].Acta Acustica,2007(1):19-25.
[6]谢骏,笪良龙,唐帅.舰船螺旋桨空化噪声建模与仿真研究[J].兵工学报,2013(3):294-300.XIE Jun,DA Liang-long,TANG Shuai.Modeling and simulation of vessel propeller cavitation noise[J].Acta Armamentarii,2013(3):294-300.
[7]冯源,陶然,王越.加速螺旋桨水声信号建模及其特性分析[J].中国科学:信息科学,2011(04):476-487.FENG Yuan,TAO Ran,WANG Yue.Modeling and characteristic analysis of underwater acoustic signal of the accelerating propeller[J].Scientia Sinica Informations,2011(04):476-487.
[8]陈韶华,陈川,赵冬艳.包络谱提取的4种方法比较分析[J].水雷战与舰船防,2008(4):9-12.CHEN Shao-hua,CHEN Chuan,ZHAO Dong-yan.Comparison and analysis of 4 methods in envelope spectrum extraction[J].Mine Warfare&Ship Self-defence,2008(4):9-12.
[9]蒋国健,马杰,林建恒,等.舰船噪声不同窄带包络间相关[J].声学学报,2002(5):425-428.JIANG Guo-jian,MA Jie,LIN Jian-heng,et al.Encelops correlation between different narrow-band filtered shio noise[J].Acta Acustica,2002(5):425-428.
[10]王志强,李震宇,吴琳,等.螺旋桨临界转速分析方法研究[C]//第十二届船舶水下噪声学术讨论会,2009.