Vibratory apparatus for use in seismic exploration

Details Vibratory apparatus for use in seismic exploration Vibratory apparatus for use in seismic exploration

1975-04-14

1977-03-29

Sebastian, Leland A.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181119, 181121, 181142, 181401, 340 17R, G01V 104

Patent

active

040144038

ABSTRACT:
In a variable frequency seismic vibrator including an earth coupling plate, means for generating a reaction impedance, and an energy source for generating reciprocating movement of the coupling plate relative to the reaction impedance, the reaction impedance is generated by a reaction mass and a spring of variable stiffness which couples the reaction mass to the vibrator. As the frequency of vibration changes, the stiffness of the spring is automatically adjusted so that the impedance of the spring resonates with the impedance of the mass to maximize the reaction impedance, thereby increasing the operating efficiency of the vibrator.

REFERENCES:
patent: 3106982 (1963-10-01), Wade
patent: 3363720 (1968-01-01), Mifsud et al.
patent: 3373841 (1968-03-01), Miller
patent: 3578102 (1971-05-01), Ross

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