摘要
基于光纤水声传感器,提出了一种水声信号能量阈值与强线谱时频特征相结合进行内河航道航运流量监测的方法,解决了内河航运流量较大时,特别是多艘船只同时通过时的船只计数难题.时长45min的现场声压数据的处理结果验证了该方法的有效性.
Based on a set of optic fiber sensors,an algorithm was proposed to count ships in inland waterways by combining the threshold of sound energy and the time-frequency characteristics of strong line spectrums,which solved the counting problem emerged when a number of ships went through the monitored water area in parallel.The processing results of a piece of 45 minutes long sound pressure data proved the effectiveness of this algorithm.
引文
[1]WANG Wen-sheng,YANG Xiu-ting.Theoretical performance of near-field conventional beamforming by using linear array sonar[J].Technical Acoustics,2009,28(6):729-733.
[2]HUI Juan,HU Dan,HUI Jun-ying.Researches on the measurement of distribution image of radiated noise using focused beamforming[J].Chinese Journal of Acoustics,2008,27(2):119-128.
[3]吴国清,李靖,陈耀明.舰船噪声识别(I)—总体框架、线谱分析和提取[J].声学学报,1998,23(5):394-400.WU Guo-qing,LI Jing,CHEN Yao-ming.Ship radiated-noise recognition(I)the overall framework,analysis and extraction of line-spectrum[J].Acta Acustica,1998,23(5):394-400.
[4]罗建,湛雅倩,马定坤.舰船多辐射声源近距离通过特性的仿真[J].应用声学,2008,27(2):108-112.LUO Jian,ZHAN Ya-qian,MA Ding-kun.Simulation of short-distance-through-signature considering multiradiation sources of a ship[J].Applied Acoustics,2008,27(2):108-112.
[5]李奇虎,李敏,杨秀庭.水下目标辐射噪声中单频信号分量的监测:理论分析[J].声学学报,2008,33(3):193-196.LI Qi-hu,LI Min,YANG Xiu-ting.The detection of single frequency component of underwater radiated noise of target:Theoretical analysis[J].Acta Acustica,2008,33(3):193-196.
[6]刘小峰,柏林,秦树人.基于瞬时转速的变窗STFT变换[J].振动与冲击,2010,29(4):27-29.LIU Xiao-feng,BO Lin,QIN Shu-ren.Rotating speed-based variable window STFT[J].Journal of Vibration and Shock,2010,29(4):27-29.