Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent
1981-04-13
1985-01-08
Wilbur, Maynard R.
Acoustics
Geophysical or subsurface exploration
Seismic wave generation
181401, 367189, G01V 109
Patent
active
044922850
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Background of the Invention
1. Field of the Invention
The invention relates generally to seismic energy vibrators and, more particularly, but not by way of limitation, it relates to an improved form of vibrator system carried by a vehicle and capable of high frequency, high force input of seismic energy to the earth medium.
2. Description of the Prior Art
The prior art, of course, includes numerous types of carrier-mounted seismic vibrators which have generally taken the form of single vibrator units either center-mounted or carried across the vehicle rear end structure. U.S. Pat. No. 3,777,843 is of interest in that it discloses a dual seismic vibrator system that is center-mounted on the carrier vehicle with the vibrators carried in laterally aligned manner utilizing a single baseplate and a single lift system for engagement control. Another patent of interest is that to Silverman, U.S. Pat. No. 3,983,957, wherein dual, tandem seismic vibrators are utilized on a carrier member; however, this teaching diverges greatly from the general vibrator construction in that the carrier vehicle itself is utilized as a single reaction mass for the two seismic vibrators. Finally, a patent in the name of Meucke et al., U.S. Pat. No. 3,717,217, discloses two individually controllable seismic vibrators carried from a tracked vehicle. This teaching is directed to a mechanism mounted front and rear of the tracked vehicle which enables control and placement of the hydraulic vibrators either in front of or behind the vehicle.
SUMMARY OF THE INVENTION
The present invention contemplates a seismic vibrator system wherein dual vibrator units are carried in tandem and center-mounted on a carrier vehicle while utilizing separate vibrator lift systems and specialized carrier weight or loading control in order to achieve greater force of higher frequency input energy to the earth medium. The vibrator units are a type capable of high frequency vibration and are disposed in tandem juxtaposition on the carrier as controlled for placement by individual lift systems including vibration isolation structure and earth-coupling baseplates. Hydraulic control of the individual lift systems is maintained through a pressure regulator valve that sets a maximum lift force that is pre-adjusted at a value less than the dead weight of the carrier. Each vibrator unit is individually controlled by a separate servo valve and separate electronic control circuit, which are driven in synchronism with a common sweep control signal, as preselected.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevation showing the carrier-mounted vibrators in accordance with the present invention;
FIG. 2 is an enlarged side elevation of the vibrator assemblies of FIG. 1;
FIG. 3 is a cross-section taken along line 3--3 of FIG. 2;
FIG. 4 is a schematic illustration of the hydraulic lift system used in the present invention; and
FIG. 5 is a block diagram of the hydraulic drive and control circuitry of the present invention.
DETAILED DESCRIPTION
Referring to FIG. 1, a heavy-duty carrier vibrator vehicle 10 is constructed to carry, in tandem and center-mounted, a first vibrator assembly 12F and a second vibrator assembly 12R. The vehicle 10 may be a heavy-duty truck (as shown), a Crane Company vehicle, or it may be an off road vehicle which may or may not be articulated. Such vehicles are adaptable for various vehicle support applications. Such basic vehicle 10 includes the driving or control cab 14 as mounted on a forward wheel frame 16 and carried over forward wheels 18. A second load frame 20 is then rigidly secured on the rearward portion of front frame 16 to extend rearward terminating in support of drive engine 22 over rearwheels 24. The rearwheels 24 are a tandem drive combination while forward wheels 18 are mounted on separately steerable front axles.
An engine 26 provides power for energizing all of the associated hydraulic equipment for controlling the vibrator assemblies 12. Engine 26 in present design is a Detroit Diesel, Model 6V71. The
REFERENCES:
patent: 3106982 (1963-10-01), Wade
patent: 3717217 (1973-02-01), Muecke et al.
patent: 3777843 (1973-12-01), Fair et al.
patent: 3929206 (1975-12-01), Bedenbender et al.
patent: 3983957 (1976-10-01), Silverman
Litton Resources Flyer "Articulated Hydrostatic Vehicles" 1976.
Buller Paul L.
Fair Delbert W.
Conoco Inc.
Kaiser K. R.
Miller William J.
Wilbur Maynard R.
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