Adaptive control for smart-actuated base isolation structures regarding various reference-tracking strategies

Yuting Ouyang, Jiazeng Shan, Weixing Shi, Billie F. Spencer

Research output: Contribution to journalArticle

Abstract

An adaptive control framework considering servo-hydraulic dynamics is proposed for base isolation structures regarding various reference-tracking strategies. The reference-tracking-based adaptive controller is derived from a backstepping design methodology with Lyapunov stability analysis. Servo-hydraulic dynamics, including the control-structure interaction (CSI) and the actuator uncertainties, have significant effects on seismic control performance; accordingly, the critical issue of the control device dynamics-induced time-lag should be introduced in the control process. To drive a successful active control event, an inverse actuator model is integrated within the proposed controller. Such inverse dynamic models, with adaptive regulation characteristics, are expected to compensate the time-lag real-time. On the other hand, for a reference-tracking-based controller, control performance is determined by a reference model. Therefore, different reference generation strategies have been discussed in a comparative study by considering the effect of structure nonlinearity and substructure-interaction. To investigate the performance of the proposed controller in detail, the first example is a nonlinear single-degree-of-freedom (SDOF) system. Then, a multi-degree-of-freedom (MDOF) system with a nonlinear base isolation layer is employed in a comparative study with various reference-tracking strategies. Subsequently, the proposed control framework has been performed in a nonlinear base isolation benchmark problem; and, the control performance demonstrates the efficacy of the reference-tracking controller in a two-dimensional actuator control problem.

Original languageEnglish (US)
Article number109574
JournalEngineering Structures
Volume198
DOIs
StatePublished - Nov 1 2019

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Keywords

  • Actuator dynamic compensator
  • Benchmark problem
  • Control-structure-interaction
  • Model uncertainty
  • Reference-tracking control

ASJC Scopus subject areas

  • Civil and Structural Engineering

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