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Timedelayed Decentralized H ∞ Controller Design for Civil Structures: a Homotopy Method through Linear Matrix Inequalities
"... Abstract—Traditional structural feedback control systems are centralized systems. The applications of these systems to large scale structures usually encounter a number of difficulties regarding system reliability, cost, and feedback latency. Decentralized control strategies offer promising alternat ..."
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Abstract—Traditional structural feedback control systems are centralized systems. The applications of these systems to large scale structures usually encounter a number of difficulties regarding system reliability, cost, and feedback latency. Decentralized control strategies offer promising alternatives that can address some of these difficulties. When making control decisions, decentralized controllers may only require data from sensors located in the neighborhood of a control device. Control decentralization lowers the demand on communication range in the sensing and control network, reduces feedback latency, and removes the risk associated with a centralized controller where singlepoint failure can paralyze the entire control system. This paper presents a timedelayed decentralized structural control strategy that aims to minimize the H ∞ norm of the closedloop system. Feedback time delay is included in the formulation for the decentralized controller design, which employs a homotopy method through linear matrix inequalities (LMI). Corresponding to certain decentralized feedback patterns, the homotopy method gradually degenerates a centralized control design into a decentralized control scheme. At each homotopy step, LMI constraints are satisfied to guarantee the performance requirement for the closedloop H ∞ norm. The proposed algorithm is validated through numerical simulations with an example structure. O I.
Multiloop Controller Synthesis and Performance Analysis
, 2004
"... Over the past few decades, many algorithms have been proposed for controller design. In practice, an engineer needs to address the following issues before the actual controller can be designed: which variables should be measured, controlled and manipulated, and what links should be made between them ..."
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Cited by 6 (6 self)
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Over the past few decades, many algorithms have been proposed for controller design. In practice, an engineer needs to address the following issues before the actual controller can be designed: which variables should be measured, controlled and manipulated, and what links should be made between them. These decisions are often taken heuristically, which has an adverse effect on the safe and economic operation of the process. In this thesis, simple yet theoretically sound tools are developed for partitioning of the measurements and manipulations for control of complex systems. The task
Actuator faulttolerant control based on set separation
 International Journal of Adaptive Control and Signal Processing
, 2010
"... In this report an actuator faulttolerant control (FTC) strategy based on set separation is presented. The proposed scheme employs a bank of observers which match the dierent fault situations that can occur in the plant. Each of these observers has an associated estimation error with a distinctive b ..."
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In this report an actuator faulttolerant control (FTC) strategy based on set separation is presented. The proposed scheme employs a bank of observers which match the dierent fault situations that can occur in the plant. Each of these observers has an associated estimation error with a distinctive behaviour when a estimator matches the current fault situation of the plant. With this information from each observer, a fault diagnosis and isolation (FDI) module is able to recongure the control loop by selecting the appropriate stabilising controller from a bank of precomputed control laws, each of them related to one of the considered fault models. The control law consists of a reference feedforward term and a feedback gain multiplying the state estimate provided by the matching observer. The decision criteria of the FDI is based on the computation of sets towards which the output estimation errors related to each fault scenario and for each control conguration converge. Conditions for the design of the FDI module and for fault tolerant closedloop stability are given, and the eectiveness of the approach is illustrated by means of a numerical example. Maria Seron and Jose de Dona are with the ARC Centre for Complex Dynamic Sys
Databased Techniques to Improve State Estimation in Model Predictive Control
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Structural Control with MultiSubnet Wireless Sensing Feedback: Experimental Validation of TimeDelayed Decentralized H ∞ Control Design
"... This study investigates the feasibility of deploying wireless communication and embedded computing for structural control applications. A feedback structural control system involves a network of sensors and control devices. As control devices are becoming smaller, more cost effective and reliable, o ..."
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This study investigates the feasibility of deploying wireless communication and embedded computing for structural control applications. A feedback structural control system involves a network of sensors and control devices. As control devices are becoming smaller, more cost effective and reliable, opportunities are now available to instrument a structure with large number of control devices. However, instrumenting a large scale centralized control system with cables can be time consuming, labor intensive, and difficult to maintain and reconfigure. This study explores decentralized feedback control using wireless sensors incorporated with a computational core and a signal generation module. Decentralized control architectures are designed to make control decisions based on data acquired from sensors located in the vicinity of a control device. Specifically, this paper describes the experimental validation of a timedelayed decentralized structural control strategy that aims to minimize the H ∞ norm of a closedloop control system. The decentralized controller design employs a homotopy method that gradually transforms a centralized controller into
A.: Intelligent robust controller design for a microactuator
 Journal of Intelligent and Robotic Systems
"... Abstract — In this article the design of an intelligent robust controller for a Micro–Actuator (µ−A) is presented. The µ−A is composed of a micro–capacitor, whose one plate is clamped while its other flexible plate’s motion is constrained by hinges acting as a combination of springs and dashpots. Th ..."
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Abstract — In this article the design of an intelligent robust controller for a Micro–Actuator (µ−A) is presented. The µ−A is composed of a micro–capacitor, whose one plate is clamped while its other flexible plate’s motion is constrained by hinges acting as a combination of springs and dashpots. The distance of the plates is varied by the applied voltage between them. The dynamics of the plate’s rigidbody motion results in an unstable, nonlinear system. The control structure is constructed from: a) a feedforward controller which stabilizes the micro– actuator around its nominal operating point, b) a robust PID controller whose gains are initially tuned via the utilization of Linear Matrix Inequalities (LMIs) and subsequently are switched according to the position of the upper plate, and c) an intelligent prefilter which appropriately shapes the reference signal. The resulting overall control scheme is applied to the non–linear model of the µ–A where simulation results are presented to prove the efficacy of the suggested scheme. I.
Synthesizing switching controllers for hybrid systems by continuous invariant generation
 CORR ABS/1304.0825
, 2013
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A Robust Distributed Model Predictive Control Algorithm
 J. Process Contr
"... I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. ..."
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Cited by 2 (0 self)
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I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required final revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public.
A Statistical Learning Theory Approach for Uncertain Linear and Bilinear Matrix Inequalities
, 2013
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Beamforming Design for Weighted SumRate Maximization in MIMO Broadcast Channels 1
"... This work studies linear transmit filter design for Weighted SumRate (WSR) maximization in the Multiple Input Multiple Output Broadcast Channel (MIMOBC). The problem of finding the optimal transmit filter is nonconvex and intractable to solve. Motivated by the wellknown rate optimality of Weight ..."
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This work studies linear transmit filter design for Weighted SumRate (WSR) maximization in the Multiple Input Multiple Output Broadcast Channel (MIMOBC). The problem of finding the optimal transmit filter is nonconvex and intractable to solve. Motivated by the wellknown rate optimality of Weighted Minimum Mean Square Error (WMMSE) optimization in the single user case, this paper suggests to use WMMSE optimization in the MIMOBC. The paper presents a twostep iterative algorithm to compute the Mean Square Error (MSE)weights that maximize WSR. Numerical results for sumrate using the derived filter show that comparable or higher sumrates can be achieved as compared to existing, more complex filter designs under different system settings. I.