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- Active disturbance rejection (2)
- Active magnetic bearing; Adaptive back stepping control; Adaptive laws; Lyapunov function (1)
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- Disturbance rejection (1)
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- Electrochemical immunosensing;electrochemistry;enzymatic detection;enzymes;immune complexes (1)
- GUPFC; FACTS; DHD; Linear time-invariant system; FFT; PQ indices (1)
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- Modulation and coding methods; Other topics in statistics; Radio links and equipment (1)
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Articles 1 - 9 of 9
Full-Text Articles in Engineering
Adaptive Control Of An Active Magnetic Bearing With External Disturbance, Lili Dong, Silu You
Adaptive Control Of An Active Magnetic Bearing With External Disturbance, Lili Dong, Silu You
Electrical and Computer Engineering Faculty Publications
Adaptive back stepping control (ABC) is originally applied to a linearized model of an active magnetic bearing (AMB) system. Our control goal is to regulate the deviation of the magnetic bearing from its equilibrium position in the presence of an external disturbance and system uncertainties. Two types of ABC methods are developed on the AMB system. One is based on full state feedback, for which displacement, velocity, and current states are assumed available. The other one is adaptive observer based back stepping controller (AOBC) where only displacement output is measurable. An observer is designed for AOBC to estimate velocity and …
Modified Active Disturbance Rejection Control For Time-Delay Systems, Shen Zhao, Zhiqiang Gao
Modified Active Disturbance Rejection Control For Time-Delay Systems, Shen Zhao, Zhiqiang Gao
Electrical and Computer Engineering Faculty Publications
Industrial processes are typically nonlinear, time-varying and uncertain, to which active disturbance rejection control (ADRC) has been shown to be an effective solution. The control design becomes even more challenging in the presence of time delay. In this paper, a novel modification of ADRC is proposed so that good disturbance rejection is achieved while maintaining system stability. The proposed design is shown to be more effective than the standard ADRC design for time-delay systems and is also a unified solution for stable, critical stable and unstable systems with time delay. Simulation and test results show the effectiveness and practicality of …
On The Centrality Of Disturbance Rejection In Automatic Control, Zhiqiang Gao
On The Centrality Of Disturbance Rejection In Automatic Control, Zhiqiang Gao
Electrical and Computer Engineering Faculty Publications
In this paper, it is shown that the problem of automatic control is, in essence, that of disturbance rejection, with the notion of disturbance generalized to symbolize the uncertainties, both internal and external to the plant. A novel, unifying concept of disturbance rejector is proposed to compliment the traditional notion of controller. The new controller-rejector pair is shown to be a powerful organizing principle in the realm of automatic control, leading to a Copernican moment where the model-centric design philosophy is replaced by the one that is control-centric in the following sense: the controller is designed for a canonical model …
M-Ary Energy Detection Of A Gaussian Fsk Uwb System, Song Cui, Fuqin Xiong
M-Ary Energy Detection Of A Gaussian Fsk Uwb System, Song Cui, Fuqin Xiong
Electrical and Computer Engineering Faculty Publications
The energy detection M-ary Gaussian frequency-shift keying (FSK) system is proposed in this paper. The system performance is analyzed in additive white Gaussian noise channels, multipath channels, and in the presence of synchronization errors. The numerical results show that the M-ary modulation achieves the higher data rate than the binary modulation. However, it also results in performance degradation.
Energy Detection Uwb System Based On Pulse Width Modulation, Song Cui, Fuqin Xiong
Energy Detection Uwb System Based On Pulse Width Modulation, Song Cui, Fuqin Xiong
Electrical and Computer Engineering Faculty Publications
A new energy detection ultra-wideband system based on pulse width modulation is proposed. The bit error rate (BER) performance of this new system is slightly worst than that of a pulse position modulation (PPM) system in additive white Gaussian noise channels. In multipath channels, this system does not suffer from cross-modulation interference as PPM, so it can achieve better BER performance than PPM when cross-modulation interference occurs. In addition, when synchronisation errors occur, this system is more robust than PPM.
Linearized Biogeography-Based Optimization With Re-Initialization And Local Search, Dan Simon, Mahamed G. H. Omran, Maurice Clerc
Linearized Biogeography-Based Optimization With Re-Initialization And Local Search, Dan Simon, Mahamed G. H. Omran, Maurice Clerc
Electrical and Computer Engineering Faculty Publications
Biogeography-based optimization (BBO) is an evolutionary optimization algorithm that uses migration to share information among candidate solutions. One limitation of BBO is that it changes only one independent variable at a time in each candidate solution. In this paper, a linearized version of BBO, called LBBO, is proposed to reduce rotational variance. The proposed method is combined with periodic re-initialization and local search operators to obtain an algorithm for global optimization in a continuous search space. Experiments have been conducted on 45 benchmarks from the 2005 and 2011 Congress on Evolutionary Computation, and LBBO performance is compared with the results …
Mediator-Less Immunodetection With Voltage-Controlled Intrinsic Amplification For Ultrasensitive And Rapid Detection Of Microorganism Pathogens, Jiapeng Wang, Yan Xu, Siu-Tung Yau
Mediator-Less Immunodetection With Voltage-Controlled Intrinsic Amplification For Ultrasensitive And Rapid Detection Of Microorganism Pathogens, Jiapeng Wang, Yan Xu, Siu-Tung Yau
Electrical and Computer Engineering Faculty Publications
A mediator-less immunodetection method for microorganisms is realized by incorporating the newly developed field-effect enzymatic detection (FEED) technique with the conventional electrochemical immunosensing approach. The gating voltage of FEED facilitates the transduction of electrical signal through the bulky immune complex so that the detection does not rely on the use of mediators or other diffusional substances. The voltage-controlled intrinsic amplification provided by the detection system allows detection in low-concentration samples without target pre-enrichment, leading to ultrasensitive and rapid detection. The detection approach is demonstrated with E. coliO157:H7, a model microorganism, in milk with an estimated detection limit of 20 CFU …
Hybrid Biogeography-Based Evolutionary Algorithms, Haiping Ma, Dan Simon, Minrui Fei, Xinzhan Shu, Zixiang Chen
Hybrid Biogeography-Based Evolutionary Algorithms, Haiping Ma, Dan Simon, Minrui Fei, Xinzhan Shu, Zixiang Chen
Electrical and Computer Engineering Faculty Publications
Hybrid evolutionary algorithms (EAs) are effective optimization methods that combine multiple EAs. We propose several hybrid EAs by combining some recently-developed EAs with a biogeography-based hybridization strategy. We test our hybrid EAs on the continuous optimization benchmarks from the 2013 Congress on Evolutionary Computation (CEC) and on some real-world traveling salesman problems. The new hybrid EAs include two approaches to hybridization: (1) iteration-level hybridization, in which various EAs and BBO are executed in sequence; and (2) algorithm-level hybridization, which runs various EAs independently and then exchanges information between them using ideas from biogeography. Our empirical study shows that the new …
Dynamic Modeling And Analysis Of Generalized Power Flow Controller, B. Vyakaranam, F. E. Villaseca
Dynamic Modeling And Analysis Of Generalized Power Flow Controller, B. Vyakaranam, F. E. Villaseca
Electrical and Computer Engineering Faculty Publications
This paper presents a unified solution to compute power quality indices in the generalized unified power flow controller (GUPFC) during steady and transient conditions using a dynamic harmonic domain technique. This technique allows the user to analyze harmonics generated in the GUPFC more precisely than using time domain techniques. The derivation of a model is presented and then simulated in the presence of voltage disturbances to demonstrate its use in power quality assessment. The results of the proposed model are validated against time domain simulations.