Mass oscillator having an adjustable gas spring

Details Mass oscillator having an adjustable gas spring Mass oscillator having an adjustable gas spring

1994-03-25

1996-02-13

Lobo, Ian J.

Acoustics

Geophysical or subsurface exploration

Well logging

181119, G01V 140, G01V 104

Patent

active

054913063

ABSTRACT:
An apparatus for oscillating a mass at a plurality of selective frequencies includes a source of compressible fluid and a cylinder having a bore filled with the compressible fluid. The cylinder includes a port opening to the bore, the port being connected to the source of compressible fluid. A piston slides in the bore to define a chamber. The piston is operably connected to the fluid mass to oscillate the mass. An average volume of the chamber is adjusted to change the frequency of the oscillating mass.

REFERENCES:
patent: 3909776 (1975-09-01), Broding et al.
patent: 4396088 (1983-08-01), Bayhi
patent: 4483411 (1984-11-01), Mifsud
patent: 4671379 (1987-06-01), Kennedy et al.
patent: 4834210 (1989-05-01), Kennedy
patent: 4850449 (1989-07-01), Cheung
patent: 4993001 (1991-02-01), Winbow et al.
patent: 5371330 (1994-12-01), Winbow

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