Optimal Control of a Double Integrator: A Primer on Maximum by Arturo Locatelli

By Arturo Locatelli

This ebook presents an introductory but rigorous remedy of Pontryagin’s greatest precept and its software to optimum keep an eye on difficulties while basic and intricate constraints act on country and keep an eye on variables, the 2 sessions of variable in such difficulties. The achievements as a result of first-order variational tools are illustrated just about a good number of difficulties that, nearly universally, relate to a selected second-order, linear and time-invariant dynamical procedure, known as the double integrator. The e-book is perfect for college kids who've a few wisdom of the fundamentals of procedure and keep an eye on conception and own the calculus heritage ordinarily taught in undergraduate curricula in engineering.

Optimal keep watch over thought, of which the utmost precept needs to be thought of a cornerstone, has been extremely popular ever because the overdue Nineteen Fifties. notwithstanding, the potentially over the top preliminary enthusiasm engendered by means of its perceived power to unravel any form of challenge gave technique to its both unjustified rejection whilst it got here to be regarded as a only summary notion without genuine software. lately it's been well-known that the reality lies someplace among those extremes, and optimum regulate has came upon its (appropriate but restricted) position inside any curriculum within which process and keep an eye on thought performs an important role.

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Thus let us denote the two switching times with τ1 and τ2 . It is apparent that u(0) = 1, because x1 (t f ) > x1 (0) and x2 (0) = 0, so that Fig. 3. State trajectories corresponding to u(·) = 1 (dash-double-dotted line), u(·) = 0 (solid line), u(·) = −1 (dash-single-dotted line) x2 0 x1 3 Simple Constraints: J = , x(t0 ) = Given 36 0 ≤ t < τ1 u(t) = 1 0 ≤ t ≤ τ1 1 x1 (t) = t 2 2 τ 1 < t < τ2 u(t) = 0 τ 1 ≤ t ≤ τ2 x2 (t) = t x2 (t) = τ1 τ2 < t ≤ t f u(t) = −1 τ2 ≤ t ≤ t f 1 x1 (t) = − (τ12 + τ22 )+ 2 1 +(τ1 + τ2 )t − t 2 2 x2 (t) = τ1 − (t − τ2 ) 1 x1 (t) = τ1 t − τ12 2 By enforcing control feasibility (x1 t f = 1, x2 t f = 0) and recalling that 0 ≤ τ1 ≤ τ2 ≤ t f , we conclude that the NC can be verified only if t f ≥ 2 and τ1 = tf − t 2f − 4 2 , τ2 = tf + t 2f − 4 2 The lower bound for the final time can easily be determined by resorting to the material of Chap.

4). We end this short presentation of the material aimed at illustrating the NC in the forthcoming nine chapters by strengthening that the conditions of the Maximum Principle presented in Sect. 2 must always be taken into account, no matter what the considered problems are and not just in the presence of simple constraints only. 4 in the last chapter of the book (Chap. 12) constitute significant applications of the local sufficient conditions of optimality. Finally, in many figures we have plotted the state trajectories of the controlled system.

All of them refer to various choices of ϕ. The state trajectories are plotted in Fig. 16. Note that the magnitude of x2 increases with ϕ. In fact an increase of ϕ causes the use of control to be less penalized when approaching the final time. Consistently, it is convenient that the variable x1 (which should be small during the transient, as expressed by the performance index) tends to x1 (t f ) = 2 as late as possible. But, then, we need large values of x2 (t) at the end of the control interval.

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