Control means for pressure fluid vibrators for generating seismi

Details Control means for pressure fluid vibrators for generating seismi Control means for pressure fluid vibrators for generating seismi

1974-08-07

1977-12-20

Wilbur, Maynard R.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

181114, 340 17R, G01V 114

Patent

active

040636135

ABSTRACT:
Improvement in electro-fluid vibrator means used for generating seismic waves in the earth in which the flow of pressurized fluid to the vibrator is controlled in accordance with the resultant holddown pressure on the baseplate in contact with the earth, so that there is always a positive pressure on the baseplate, preventing it from being lifted off the surface of the earth. Force measuring means are provided in the holddown means. So long as this force is large and positive (in the direction to hold the baseplate to the earth) no control is required. When this positive force becomes less than a preselected value, the pressure fluid system is controlled to reduce the maximum pressure of, or rate of flow of, pressure fluid to the vibrator. The force measuring system can conveniently utilize the compliances in the holddown system as the force measuring elements.

REFERENCES:
patent: 3578102 (1971-05-01), Ross et al.
patent: 3840090 (1974-10-01), Silverman

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