Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1979-02-07
1981-02-03
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181401, 73666, G01V 1133
Patent
active
042483247
ABSTRACT:
A method and apparatus for improving the power output of a seismic vibrator are provided. Compliant elements with variable stiffnesses are interposed between and connected to the holddown mass and the baseplate. When the compliant elements have a first stiffness, the vibrator-earth system has a first resonant frequency. When the compliant elements have a second stiffness, the vibrator-earth system has a second resonant frequency. During sweep, the compliant elements are set on the first stiffness until the vibrator has passed through the first resonant frequency; then the compliant elements are changed to their second stiffness and the sweep continues through the second resonant frequency.
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Exxon Production Research Company
Glober George E.
Moskowitz Nelson
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