For the experimental system, the sound field parameters have an optimal scope, which includes that frequency is 20~25 kHz, sound intensity is 0.2 to 0.4 W/cm 2, pulse width is more than 10ms, the irradiation times is higher than 3 min, the intermittent ratio is 3 to 5. the parameters chosen in the experiment provide a basis for field application, and obvious effects are achieved in the field.
②When the cylinder is excited at φ=0 by a harmonic(f=10~1 010Hz) line radial force uniformly distributing along the generator,the directivity pattern of the sound field(r=10a) is between "∞"pattern and "∞"and "8"superposeition pattern.
Analysis of 1.25D, 1.5D and 1.75D ultrasonic phased array focused acoustic field
The conventional method of modal analysis doesn't take the acoustic structural coupled factors into account for the control of vehicle interior noise generated by the interaction of structural vibration and acoustic field.
Under the condition of the inhalable particles of burned coal being subject to the action of a high intensity sonic field studied was the impact of different acoustic intensity and particle retention time in sonic field on the change of particle diameter distribution prior to and after the acoustic agglomeration.
This lecture simply introduces the relation between wave and vibration, the classification of ultrasonicwave, the trarsmission character of ultrasonicwave and the sonic field characteristic parameters.
With binaural fitting Triano S(Dual-microphone mode) and Triano 3(Tri-microphone mode), they were tested with speechrecognition in two different sound fields through PB test and investigated by means of questionnaire.
The diffracted sound fields induced by fluid noise of underwater vehicle
Results Significant differences were found between the mean L50(the S/N at which 50% of running speech is correctly understood) obtained from group A versus group B in Tri-microphone adaptive directional condition in multiple sound fields(P<0.01).
Stability of a tangential discontinuity of velocity in an acoustic field
Interaction between a supersonic jet and an acoustic field
Experimental dependences of the mean velocity and the longitudinal intensity of the turbulence are presented as a function of different parameters for both the unperturbed flow and for the flow in the acoustic field.
On the effect of an acoustic field, directed along a jet axis, on the jet
In  the more general problem of interaction of a supersonic jet with an external acoustic field is also formulated, which is in complete correspondence with the physical scheme of the phenomena developed in that article.
Comprehensive studies of sound fields in the Kuril-Kamchatka region of the northwestern Pacific
The technique, experimental conditions, and main results of comprehensive studies of sound fields in the northwestern region of the Pacific Ocean are presented.
The power-frequency, space-time, and correlation characteristics of the sound fields are studied in sonic and infrasonic frequency bands for long-and extra-long-range propagation with the use of cw and explosion-generated sound signals.
The role of front zones in the formation of sound fields received at the coastal shelf and in the open ocean is revealed.
Results of numerical simulation of the total and coherent sound fields and the coherence parameter for a multimode acoustic signal excited by a monochromatic sound source and propagating in an irregular arctic waveguide are presented.