RT Monograph SR 00 A1 Muellers, K. T1 Regulation of Oscillatory Systems Subjected to Viability Constraints YR 1994 FD 1994-09 SP 27 AB Regarding forcing terms of oscillatory systems of second-order differential equations as controls, we look for feedback (set-valued) maps governing the evolution of solutions satisfying viability of state constraints. We give a condition ensuring the existence of minimally forced solutions: the oscillation is unforced as long as viability is not at stake. Finally we compare "minimally forced oscillations" with free oscillations. PB WP-94-096 PP IIASA, Laxenburg, Austria AV Published LK https://pure.iiasa.ac.at/id/eprint/4115/