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US 4,785,430 AGranted
Hydraulic vibrator with wide dynamic range
AssigneeConoco Inc.
InventorJack H. Cole
Life of this patent
Estimating the term…
Abstract
Vibrator apparatus having adjustable cylinder volume by means of a continuously adjustable end sleeve that varies the axial limit of the cylinder. A reaction mass with an axial cylinder bore reciprocates on a double rod piston. Frist and second end sleeves define the cylinder volume and one end sleeve is threaded and axially translatable relative to the piston to vary volume while a position sensing device continually maintains centering of the piston in the cylinder.
Claims11
Apparatus for generating controlled vibrations, comprising:
- a frame means;
- piston means extending opposite first and second rod ends which are rigidly secured in said frame means;
- a reaction mass having a cylinder bore that is reciprocally disposed on said piston means;
- first sleeve means secured between said first rod end and said reaction mass cylinder bore;
- threaded adjustable sleeve means positioned between said second rod end and said reaction mass cylinder bore and being spaced from said first sleeve means to define a cylinder space therebetween;
- a ring gear affixed to rotate said adjustable sleeve means;
- motor means energizable to drive said ring gear and adjustable sleeve means in movement to vary the volume of said cylinder space;
- shaft encoder means driven by said ring gear to produce an output indication of adjustable sleeve means position relative to said piston means;
- hydraulic means alternating fluid pressure in said cylinder bore on opposite sides of said piston means;
- and
- control means responsive to said output indication of sleeve means position to effect hydraulic centering of said piston means relative to said cylinder bore.
8 more elements
A seismic vibrator having variable bandwith capability comprising:
- a frame for imparting vibratory energy;
- a reaction mass having a cylinder bore with first and second ends and a central chamber;
- piston means having first and second rod ends securely affixed to said frame and being reciprocally disposed in said cylinder bore;
- first sleeve means sealing a first end of said cylinder bore;
- adjustable sleeve means threadedly received and sealing the second end of said cylinder bore;
- a ring gear affixed to rotate said adjustable sleeve means;
- means for driving said adjustable sleeve means to vary the volume of said central chamber;
- shaft encoder means driven by said ring gear to produce an output indication of adjustable sleeve means position relative to said piston means;
- hydraulic drive means in fluid communication with said central chamber to impart reciprocal movement at preselected frequency between said reaction mass and the frame and piston means;
- and
- control means controlling said means for driving and said hydraulic drive means and responsive to said output indication of sleeve means position to effect hydraulic centering of said piston means relative to said cylinder bore and to control said hydraulic drive means to impart said reciprocal movement.
8 more elements
Dependencies are inferred from the claim text.