A new semi-active control based on nonlinear inhomogeneous optimal control for mixed base isolation

Duc Chuan Vu (1) , Ioannis Politopoulos (1) , Sette Diop (2)

1 EMSI - Laboratoire d'Etudes de Mécanique Sismique
2 L2S - Laboratoire des signaux et systèmes

This paper presents a control algorithm for seismic mixed base isolation, combining passive isolators and semi-active viscous dampers. The objective is to limit base displacement while avoiding undesirable amplification of the response of the non-isolated modes. To this end, the proposed algorithm takes into account the constraints on the damping coefficient of the semi-active damper and information on the excitation. It is based on the approximate iterative solution, at each control time step, of a nonlinear inhomogeneous constrained optimal control problem. An autoregressive model is used to obtain, at each control time step, a prediction of the upcoming excitation in a short time interval ahead. Numerical simulation results demonstrate the efficacy of the above method, especially in improving floor response spectra, and its superiority with respect to clipped-optimal algorithms.

Domaines: Sciences de l'ingénieur [physics]; Automatique / Robotique

Duc Chuan Vu, Ioannis Politopoulos, Sette Diop. A new semi-active control based on nonlinear inhomogeneous optimal control for mixed base isolation. Structural Control and Health Monitoring, 2018, 25 (1), pp.e2032. ⟨10.1002/stc.2032⟩. ⟨hal-01643533⟩