Abstract

 

The Normal Waves Excitation by the Pulse Parametric Acoustic Array in the Shallow-Water Waveguide

V.Kurin, S.A.Egorychev, S.N.Gurbatov, N.V.Pronchatov-Rubtsov (Nizhny Novgorod State University, Nizhny Novgorod, Russia)

e-mail: nikvas@rf.unn.runnet.ru

Often as a source of a pulse radiation in shallow-water waveguides the parametric acoustics  array are used. In this case at the analysis of experimental dates (in particular, the pulse  propagation time), it is necessary to take into account the peculiarities of a difference frequency wave field formation in these conditions. This experimental work is dedicated to the travel time  examination of modal pulses at different methods of the waveguide excitation (linear and  nonlinear). The selection of pulses was done on their arrival times in a point of reception.  Besides the sound intensity dependence on depth of the receiver in each of these pulses was  investigated. It is shown that the mean group velocity of modes at the waveguide parametric  excitation is a little higher, than in a linear regime. This work was supported by the RFBR grant 02-02-17374.

 

Section : 6