PURPOSE: To restrain turbulence generated in changing the flow direction of fluid effectively so as to make the flow smooth by providing a plurality of flat speakers at the wings of a flying body, and thereby radiating sound waves to the turbulence generating on the top surfaces of the winds in response to the moving speed of the flying body.
CONSTITUTION: In the application to an aircraft, a plurality of flat speakers 12 are arranged juxtaposedly on the top surfaces of wings 11 thereof, and low frequency sound signals (about 20 to 800 Hz)from a sound source 13 is amplified with a variable gain amplifier 14 and radiated as sound waves from the speakers 12. The source 13 and the amplifier 14 can be frequency controlled and gain controlled according to detection speed information from a speed sensor 15. The control is carried out through a computer 16. Namely, since turbulence generated on the top surfaces of wings 11 increases as the moving speed of aircraft increases, the generation frequency of sound source 13 is changed properly according to the increase of moving speed of aircraft so as to increase gains of the amplifier 14.
| WO/1996/040547 | HYDROFOIL CRAFT |
| WO/2016/190822 | AIRFOIL STRUCTURE |
| JPS58218489 | CONSTRUCTION OF SHIP BODY OF TANKER OR THE LIKE |
UTSUNOMIYA KOICHI
AIURA MASAHIRO
