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A new semi‐active control based on nonlinear inhomogeneous optimal control for mixed base isolation
Author(s) -
Vu Duc Chuan,
Politopoulos Ioannis,
Diop Sette
Publication year - 2018
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.2032
Subject(s) - base isolation , control theory (sociology) , damper , nonlinear system , displacement (psychology) , limit (mathematics) , autoregressive model , optimal control , interval (graph theory) , base (topology) , excitation , acceleration , engineering , control (management) , computer science , mathematics , structural engineering , mathematical optimization , mathematical analysis , physics , frame (networking) , quantum mechanics , artificial intelligence , psychology , telecommunications , electrical engineering , classical mechanics , econometrics , combinatorics , psychotherapist
Summary 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.