A technique of quasi-optimum control

B. Friedland

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


To find the optimum control law u = u(x) for the process x = f(x, u), the Hamiltonian H = p′f is formed. The optimum control law can be expressed as u = u* = σ(p, x), where u* maximizes H. The transformation from the state x to the “costate” p entails the analytic solution of the nonlinear system: x = f(x, σ(p, x)); p = - fx p with boundary conditions at two points. Since such a solution generally can not be found, we seek a quasi-optimum control law of the form u = σ(P + Mξ, x), where x = X + ξ with small, and X, P are the solutions of a simplified problem, obtained by setting ξ = 0 in the above two-point boundary-value problem. We assume that P(X) is known. It is shown that the matrix M satisfies a Riccati equation, - M = MHXP + HPX M + MHPPM + HXX and can. be computed by solving a linear system of equations. A simple example illustrates the application of the technique to a problem with a bounded control variable.

Original languageEnglish (US)
Pages (from-to)437-443
Number of pages7
JournalJournal of Fluids Engineering, Transactions of the ASME
Issue number2
StatePublished - 1966
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering


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