This paper presents an on-line learning failure-tolerant neural controller capable of controlling buildings subjected to severe earthquake ground motions. In the proposed scheme the neural controller aids a conventional H controller designed to reduce the response of buildings under earthquake excitations. The conventional H controller is designed to reduce the structural responses for a suite ...

This paper describes a robust and non-fragile H∞ controller design method for descriptor systems with parameter uncertainties and time delay, as well as a static state feedback controller with multiplicative uncertainty. The controller existence condition, as well as its design method, and the measure of non-fragility in the controller are proposed using linear matrix inequality (LMI) technique...

Design of switching H2/H∞ output-feedback controller for discrete-time LTI systems with statemultiplicative noise is considered. The closed loop system achieves a minimum bound on the stochastic H2 performance level, while satisfying the H∞ performance. The proposed controller is based on a fuzzy supervisor which manages the combination of two separate H2 and H∞ controllers. A convex formulatio...

This paper proposes a robust H∞ control method for three-phase PWM rectifier. Based on the mathematical model of the PWM rectifier, the state equations which include outside interference are established for the standard setup H∞ control problem with suitable weighting functions. The robust H∞ controller can be derived by solving the Riccati inequality. An improved PSO algorithm is proposed in t...

The non-fragile dynamic output feedback H∞ controller design problem affected by finite word length (FWL) for linear discrete-time systems is investigated. The controller to be designed is assumed to be with additive gain variations, which reflect the FWL effects in controller implementation. A notion of structured vertex separator is proposed to approach this problem, and exploited to develop ...

The order of H∞ controller is typically as high as the model order. Such high order controllers are sometimes difficult to implement due to hardware limitations. In many cases, the higher order controller can be approximated by a reduced order controller with acceptable performance degradation. In this paper, the effectiveness of order reduction techniques is compared on an experimental setup (...

In this paper the design of an optimal nonlinear H∞ controller for flexible joint robot (FJR) is presented. An approximate solution based on Taylor Series expansion is considered for the Hamilton-Jacobi-Isaac (HJI) inequality. A two-degree-of-freedom controller combined of optimal nonlinear H∞ controller and inverse dynamics controller is proposed to tackle the regulation as well as tracking pr...

In this paper, we consider a controller failure time analysis problem for a class of symmetric linear time-invariant (LTI) systems controlled by a pre-designed symmetric static output feedback. We assume that the controller fails from time to time due to physical or purposeful reason, and analyze stability and H∞ disturbance attenuation properties for the entire system. Our objective is to find...

This paper describes a multivariable controller design procedure that uses mixed-sensitivity H-infinity control theory. The design procedure is based on the assumption that structural noise can be modeled as entering a state-space system through a random input matrix. The design process starts with a full-order flexible state-space model that undergoes a frequency-weighted balanced truncation t...