A new method for detecting line spectrum of ship-radiated noise using Duffing oscillator  

作　　者：ZHENG SiYi GUO HongXia LI YaAn WANG BingHe ZHANG PengYi 

机构地区：[1]Department of Communication Engineering, Engineering College of the Chinese People's Armed Police Force, Xi'an 710086 China [2]Department of Basic Science, Engineering College of the Chinese People's Armed Police Force, Xi'an 710086, China [3]College of Marine Engineering, Northwestern Polytechnic University, Xi'an 710072, China

出　　处：《Chinese Science Bulletin》2007年第14期1906-1912,共7页

基　　金：National Natural Science Foundation of China (Grant No. 10474079);a major project of National Defense Science and Technology (Grant No. 41303080301)

摘　　要：A detection scheme for line spectrum of ship-radiated noise is proposed using Duffing oscillator. The chaotic trajectory of Duffing oscillator is analyzed and the state equation of the system is improved to detect weak periodic signals in different frequencies. According to the simulation results, the phase transforms of Duffing oscillator are sensitive to periodic signals and immune to the random noise and the periodic interference signals which have larger angular frequency difference from the referential signal. By employing Lyapunov exponents in the field of detection as the criteria for chaos, the phase transforms of dynamic behaviors in quantity are successfully determined. Meanwhile, the threshold value in critical state has been evaluated more accurately. Based on the phase transforms of Duffing oscillator, a new method for detecting line spectrum of ship-radiated noise is given. Three types of ship-radiated noise signals are analyzed and the values of line spectrum are acquired successfully by this method. The experimental results show that this method has high sensitivity and high resolution.A detection scheme for line spectrum of ship-radiated noise is proposed using Duffing oscillator. The chaotic trajectory of Duffing oscillator is analyzed and the state equation of the system is improved to detect weak periodic signals in different frequencies. According to the simulation results, the phase transforms of Duffing oscillator are sensitive to periodic signals and immune to the random noise and the periodic interference signals which have larger angular frequency difference from the referential signal. By employing Lyapunov exponents in the field of detection as the criteria for chaos, the phase transforms of dynamic behaviors in quantity are successfully determined. Meanwhile, the threshold value in critical state has been evaluated more accurately. Based on the phase transforms of Duffing oscillator, a new method for detecting line spectrum of ship-radiated noise is given. Three types of ship-radiated noise signals are analyzed and the values of line spectrum are acquired successfully by this method. The experimental results show that this method has high sensitivity and high resolution.

关 键 词：光谱 噪声 煤粉震荡器 混沌学说 

分 类 号：O43[机械工程—光学工程]