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Volume 58 Number 1
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Hydraulic limitations, non‐rigidity of the baseplate as well as variable characteristics of the ground constantly distort the downgoing energy output by vibrators. Therefore, a real time feedback control must be performed to continuously adjust the emitted force to the reference pilot signal. This ground force is represented by the weighted sum of the reaction mass and the baseplate accelerations. It was first controlled with an amplitude and phase locked loop system, poorly reactive and sensitive to noise. Later on, new vibrator electronics based on a digital model of the vibrator were introduced. This model is based on the physical equations of the vibrator and of the ground. During an ‘identification’ process, the model is adjusted to each particular vibrator. Completed by a Kalman adaptive filter to remove the noise, it computes ten estimated states via a linear quadratic estimator. These states are used by a linear quadratic control to compute the torque motor input and to compare the ground force estimated from the states with the pilot signal. Test results using downhole geophones demonstrate the benefit of filtered mode operation.

© 2009 European Association of Geoscientists & Engineers
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2009-12-01
2024-04-23

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Developments in vibrator control
Geophysical Prospecting 58, 33 (2010); https://doi.org/10.1111/j.1365-2478.2009.00848.x
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  • Article Type: Research Article

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