Applications of Time Delay Systems by John Chiasson, Jean Jacques Loiseau

By John Chiasson, Jean Jacques Loiseau

This e-book offers an replace of the newest study accountable for time hold up structures and functions through global major specialists. it is going to entice engineers, researchers and scholars on top of things.

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First, the problem of robustness with respect to the knowledge of the delay can be tackled by the frequency approach, in the case of a constant delay. Then, the H ∞ synthesis is used to reject a disturbance on the state, by partially taking into account the time variation of the delay. A control scheme using explicitely the network dynamics and an observer-based control law are presented in the third subsection. To finish, we consider some elements of numerical analysis to compensate for the instabilities induced by the computation of the integral term in the state predictor.

18)-(19) can now ˙ be substituted in (15) to obtain the dynamics δ(t). Example 2. Considering the delay induced by the network corresponding to the previous example, the predictor’s horizon is computed for two different values of λ and compared with the exact value (computed using dichotomy) in figure 3. This simulation shows the effectiveness of the proposed estimation to compute the time-varying horizon. The estimated horizon quickly converges toward its exact value (depending on the choice of λ).

4 Numerical Problems Induced by the Computation of the Integral Term The computation of the predictive control law is typically carried out thanks to a finite approximation of the integral part. This leads to a discrete version which can induce some numerical instabilities. Three studies, carried out for the case of the constant delays, are quickly described here: • The implementation by numerical quadrature methods is studied in [22], where it appears that the most precise methods give the worst results (they induce more oscillations).

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