A STUDY ON SHIP RADIATED NOISEIRHYTHMS （I）——MATHEMATICAL MODEL AND POWER SPECTRUM DENSIDY

The sources of ship-radiated noise rhythms are analysed, the frequent types of rhythms are classified in this paper. The noise modulation envelope is treated as a pulsatory random process with same shape, equal iterative period, random amplitute and structure of group by group in this paper. Various types of modulation envelope power spectra are calculated. The theoretical results are in good agreement with experimental results.