Seismic vibrator controlled by directly detecting base plate...

G - Physics – 01 – V

Patent

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Details

G01V 1/143 (2006.01) G01V 1/133 (2006.01)

Patent

CA 2760695

A seismic vibrator has a base plate with at least four isolators isolating a frame from the base plate. Each of these isolators is offset from the plate's footprint on shelves to free up area on the plate's top surface. An accelerometer disposed directly on the base plate detects the acceleration imparted to the plate. To reduce flexing and bending, the plate has an increased stiffness and approximately the same mass of a plate for a comparably rated vibrator. The accelerometer disposes at a particular location of the plate that experiences transition between longitudinal flexing along the plate's length. This transition location better represents the actual acceleration of the plate during vibration and avoids overly increased and decreased acceleration readings that would be obtained from other locations on the plate.

L'invention concerne un vibrateur sismique doté d'une semelle et d'un bâti isolé de la semelle par au moins quatre isolateurs. Chacun de ces isolateurs est décalé par rapport à l'emprise de la semelle sur des plateaux afin de dégager un espace sur la surface supérieure de la semelle. Un accéléromètre disposé directement sur la semelle détecte l'accélération communiquée à celle-ci. Afin de réduire la flexion et le gauchissement, la semelle présente une rigidité accrue et approximativement la même masse qu'une semelle prévue pour un vibrateur de classe comparable. L'accéléromètre se trouve à un emplacement particulier sur la semelle, soumis à une transition entre des modes de flexion longitudinale suivant la longueur de la semelle. Cet emplacement de transition location représente mieux l'accélération effective de la semelle en cours de vibration et évite des indications d'accélération exagérément accrues et diminuées qui seraient obtenues à partir d'autres emplacements sur la semelle.

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