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Approximation of control laws with distributed delays: a necessary condition for stability

Sabine MondiéMichel DambrineOmar Santos — 2002

Kybernetika

The implementation of control laws with distributed delays that assign the spectrum of unstable linear multivariable systems with delay in the input requires an approximation of the integral. A necessary condition for stability of the closed-loop system is shown to be the stability of the controller itself. An illustrative multivariable example is given.

The control of drilling vibrations: A coupled PDE-ODE modeling approach

Belem SaldivarSabine MondiéJuan Carlos Avila Vilchis — 2016

International Journal of Applied Mathematics and Computer Science

The main purpose of this contribution is the control of both torsional and axial vibrations occurring along a rotary oilwell drilling system. The model considered consists of a wave equation coupled to an ordinary differential equation (ODE) through a nonlinear function describing the rock-bit interaction. We propose a systematic method to design feedback controllers guaranteeing ultimate boundedness of the system trajectories and leading consequently to the suppression of harmful dynamics. The...

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