... The rings were sounded by monostatic scheme operating at frequency 1 MHz, ping duration 40 us, repetition period 0.16 s. Simultaneously, optical visualization of the rings was performed, so the geometry of the scattering ring itself as well as the wake ...
... of noise generation in vortex rings (quadrupole and octupole components) built by ... is shown theoretically by the example of vortex ring, that the main difference from ...
... Nonlinear evolution equations for an axisymmetric ring element of the sheet are derived by means of the membrane approximation under the influence of its own inertia, surface tension and gaseous hydrostatic pressure. ...
... In this domain the ring up times of fundamental frequency signal can be greater than the duration of the pump pulse, and the corresponding component in the radiation spectrum can be interpreted as the appearance of subharmonic component below threshold. ...
... Experimental Study of Sound Scattering by Vortex Rings . Y.D.Chashechkin, V.E.Prokhorov (Institute for Problems in Mechanics RAS, Moscow, Russia) . ...