Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1991-03-28
1993-02-16
Eldred, J. Woodrow
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181114, 367189, 367 75, G01V 104
Patent
active
051873311
ABSTRACT:
The SH wave generating apparatus includes a driving plate (1) of increased rigidity; a fixing device (6) provided on the bottom of the driving plate for fixing the driving plate onto the earth's surface; a plurality of hydraulic actuators (2) mounted on the driving plate, which have reaction masses and act tangentially on the same circumference from the center of the driving plate; and a driving device (4,5) for reciprocating the plurality of hydraulic actuators (2) at a controlled frequency, thereby generating transverse waves. The plurality of hydraulic actuators (2) are equidistantly mounted on the driving plate (1), and each include a cylinder (2) and a piston rod extending therethrough. The said piston rod is mounted at both ends on supports (3) fixed to the driving plate (1) and the cylinder acts as a reaction mass. Alternatively, the piston rod extending through the cylinder 2 may be provided at both ends with reaction masses. The plurality of hydraulic actuators (2) are reciprocated synchronously or at controlled phases to generate SH or S waves. Also, the driving plate (1) is provided at its center with a vertical member (11) for applying vertical load through a bearing (7) and a pneumatic spring (8). Connected to a central portion of a motor vehicle, the vertical member (11) is designed to apply vertical load to the present apparatus through hydraulic mechanisms and hold up the present apparatus while on wheels.
REFERENCES:
patent: 3280935 (1966-10-01), Brown
patent: 4321981 (1982-03-01), Waters
patent: 4735280 (1988-04-01), Cole
patent: 4842094 (1989-06-01), Willis
patent: 4848512 (1989-07-01), Airhart
patent: 4871045 (1989-10-01), Cole
Agency of Industrial Science and Technology
Eldred J. Woodrow
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