Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1977-03-03
1978-09-26
Birmiel, Howard A.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181114, 180116, G01V 114
Patent
active
041163010
ABSTRACT:
Apparatus for supplying a large amount of air periodically at a controlled rate to the air cushion beneath an air-cushion vehicle as particularly employed for coupling of controlled frequency seismic energy into the earth. The apparatus consists of a vehicle body which includes a compressed air supply or input to a self-contained plenum chamber space for applying air pressure through a multi-port rotary valve thereafter to be directed into an air cushion formed between the vehicle and the earth surface with periodic exhaust to the atmosphere. The rotary air modulator or valve is comprised of a cylindrical stator, a rotor, and a shutter, each of which includes a plurality of equispaced ports, and air flow from the plenum chamber to the air cushion is modulated by passage through the stator and rotor in accordance with an intermediate shutter position; pressure exhaust is similarly controlled. The rotary air modulator valve may be driven by a servo controlled hydraulic motor to enable control of the periodic rate of flow into and out of the air cushion.
REFERENCES:
patent: 3701968 (1972-10-01), Broding
patent: 3727717 (1973-04-01), Miller
patent: 3792751 (1974-02-01), Fair
patent: 3915257 (1975-10-01), Dunlap et al.
Birmiel Howard A.
Continental Oil Company
Miller William J.
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