Preliminary modelling of line spectrum for radiated noise induced by high speed counter rotation of underwater vehicle propellers

This paper analyses some statistical characteristics of line spectrum for radiated noise induced by a high speed underwater manoeure vehicle. It proposed that line spectrum is mainly composed of the leave's rate and harmonic frequencies of propellers. On the basis of above research, math model of line spectrum for radiated noise is established by the periodical signal. Line spectrum frequency of different rotational speed underwater vehicles can be predicted by applying the model.