Performance and stability characteristics of risk-sensitive controlled structures under seismic disturbances

Chang Hee Won, Michael K. Sain, B F Spencer

Research output: Contribution to journalArticlepeer-review


This paper introduces the notion of risk-sensitive (RS) controllers for the protection of civil engineering structures from seismic disturbances. The risk-sensitive strategies are a generalization of linear-quadratic-Gaussian (LQG) controllers, and are stochastic cousins to counterparts based upon dynamic games and H methods. Even though much research is done in the area of risk-sensitive control theory, not much is known about risk-sensitive controller characteristics. In this paper a risk-sensitive acceleration feedback control for a multi-degree-of-freedom structure is investigated. Performance and relative stability comparisons are made between the risk-sensitive controller and a classical H2/LQG controller. Moreover, by means of reliability analysis, it is shown that the risk-sensitive controller family can influence such performance features as probability of instability and stationary covariances of state variables and control actions - in the context of buildings with earthquake excitation and real parameter uncertainties described by probability distributions.

Original languageEnglish (US)
Pages (from-to)1926-1930
Number of pages5
JournalProceedings of the American Control Conference
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Control and Systems Engineering

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