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- W2075024510 abstract "A single-degree-of-freedom system is excited by a white-noise random force. The system's re sponse can be reduced by a control force of limited magnitude R, and the problem is to minimize the expected response energy at a given time instant T under this constraint. A hybrid solution to the corresponding Hamilton-Jacobi-Bellman (or HJB) equation is obtained for the case of a linear controlled system. Specif ically, an exact analytical solution is obtained within a certain outer domain with respect to a strip with switching lines, indicating optimality of a dry-friction, or the simplest version of the bang-bang control law within this domain. This explicit solution is matched by a numerical solution within an inner domain, where switching lines are illustrated. In the limiting case of a weak control, or small R, the hybrid solution leads to a simple asymptotically suboptimal dry-friction control law, which is well-known for deterministic optimal control problems; more precisely, the difference in expected response energies between cases of opti mal and suboptimal control is shown to be proportional to a small parameter. Numerical results are presented, which illustrate the optimal control law and evolution of the minimized functional. They are used in particular to evaluate convergence rate to the derived analytical results for the suboptimal weak control case. A special case of a nonlinear controlled system is considered also, one with a rigid barrier at the system's equilibrium position. The resulting vibroimpact system is studied for the case of perfectly elastic impacts/rebounds by us ing special piecewise-linear transformation of state variables, which reduces the system to the nonimpacting one. The solution to the HJB equation is shown to be valid for the transformed system as well, resulting in the optimal control law for the vibroimpact system." @default.
- W2075024510 created "2016-06-24" @default.
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- W2075024510 date "2000-07-01" @default.
- W2075024510 modified "2023-10-16" @default.
- W2075024510 title "Optimal Bounded Response Control for a Second-Order System Under a White-Noise Excitation" @default.
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- W2075024510 doi "https://doi.org/10.1177/107754630000600506" @default.
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