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Extra resources for Singular Perturbations in Systems and Control
Example text
We will now illustrate the procedure of matching and forming composite solutions to first order by working out the details for the slow state x. 25) is satisfied and the boundary layer motions have reached their equilibrium values forT > T* and a> a*. For matching, the following are needed: (i) beha- vior of x0 near t = 0 and t = T; (ii) behavior of xil for large T, and (iii) behavior of x i2 for large a. 8) were used. 2. D. 15), as expected. 39) is a consequence of boundary layer stability and the smoothness of f(•).
1) Then there will be a sequence of initial and terminal boundary layer problems, each of which is a second order system subject to one boundary condition. 9) is identically zero. This condition can be used to furnish the second constant of integration for the boundary layer systems with the result that two point boundary value problems, which generally require iterative solutio~ are avoided in the An Introduction to Singular Perturbations 39 boundary layer problems. In this section, we will apply the method of matched asymptotic exlansion to the nonlinear optimal control problem.
I 2) Yr H u r x (0) r where, for example, f X r o (O); A (T) r 0 denotes f(x ,y ,u ,O,t); the reduced state, adjoint, and r r r control variables are of course functions only of t. 11), called herein the initial and the terminal. 11): (A) additional smoothness of the system functions, (B) existence of a solution to the reduced problem (2. 12), An Introduction to Singular Perturbations 29 (C) satisfaction of an eigenvalue criterion that insures local boundary layer stability, (D) satisfaction of a requirement that the stable boundary layer solutions have enough independent parameters to satisfy all relevant boundary conditions, and (E) assurance that the boundary conditions are in the domain of influence of the reduced solution evaluated at the boundaries.