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Hak-Keung Lam
King's College London
354Publications
43H-index
6,475Citations
Publications 354
Newest
Published in Automatica 6.36
Hong Lin5
Estimated H-index: 5
(SZPT: Shenzhen Polytechnic),
JamesLAM89
Estimated H-index: 89
(HKU: University of Hong Kong)
+ -3 AuthorsHak-Keung Lam43
Estimated H-index: 43
('KCL': King's College London)
Abstract In this paper, we investigate state estimation for systems with packet dropouts. According to whether there are acknowledgment (ACK) signals sent by the actuator to the estimator indicating the status of control packet dropouts or not, the systems are classified into two types: ACK systems, those with ACK signals, and non-ACK (NACK) systems, those without. We first obtain the optimal estimator (OE) for NACK systems with Markovian packet dropouts. However, the number of the components in...
Published on Sep 1, 2019in Journal of Sound and Vibration 3.12
Jie Fu13
Estimated H-index: 13
(Chongqing University),
Junfeng Bai1
Estimated H-index: 1
(Chongqing University)
+ 3 AuthorsHak-Keung Lam43
Estimated H-index: 43
('KCL': King's College London)
Abstract This paper presents the design method of an adaptive fuzzy controller (AFC) for a magnetorheological elastomer (MRE) vibration isolation system with time-varying sinusoidal excitations. In the first place, Kelvin model of MRE isolator without application of driving current is obtained by acceleration sweep experiments on a shake table, which establishes a foundation for the design of adaptive law. Secondly, a semi-active AFC with factor adjustment mechanism is designed based on the tran...
Shuhuan Wen3
Estimated H-index: 3
(Yanshan University),
Di Zhang (Yanshan University)+ -3 AuthorsYongsheng Zhao2
Estimated H-index: 2
(Colombian Ministry of National Education)
Published on Jan 1, 2018in IEEE Transactions on Fuzzy Systems 8.76
Changzhu Zhang3
Estimated H-index: 3
,
Hak-Keung Lam43
Estimated H-index: 43
+ 2 AuthorsQijun Chen7
Estimated H-index: 7
This paper examines the problem of membership-function-dependent controller design for a class of discrete-time T-S fuzzy systems. Based on the partition method of premise variable space, the original T-S fuzzy model is equivalently converted into a piecewise-fuzzy system. Then, by employing some staircase functions, the continuous membership functions are approximated by a series of discrete values via which the information of membership functions is brought into the stability analysis to reduc...
Published on Jul 1, 2019in Neurocomputing 4.07
Meng Han (Yanshan University), Hak-Keung Lam43
Estimated H-index: 43
('KCL': King's College London)
+ 2 AuthorsChangzhu Zhang (Tongji University)
Abstract This paper presents a methodology to investigate the observer-based control for positive nonlinear systems with unknown time delay through analyzing the stability and positivity of positive polynomial fuzzy-model-based (PPFMB) observer-control systems with unknown time delay and unmeasurable premise variables. In order to widen the application of research results and relax the research results, the polynomial fuzzy observer-controller employs a membership function depending on estimated...
Published on Jan 1, 2018in IEEE Transactions on Fuzzy Systems 8.76
Xiaojie Su22
Estimated H-index: 22
(Chongqing University),
Yao Wen1
Estimated H-index: 1
(Chongqing University)
+ 1 AuthorsHak-Keung Lam43
Estimated H-index: 43
('KCL': King's College London)
This paper is concerned with the problem of generalized \mathcal {H}_{2}reduced-order filter design for continuous Takagi–Sugeno fuzzy systems using an event-triggered scheme. For a continuous Takagi–Sugeno fuzzy dynamic system, a reduced-order filter is designed to transform the original model into a linear lower order one. This filter can also approximate the original system with \mathcal {H}_{2}performance, with a new type of event-triggered scheme used to decrease the communication loa...
Published on Apr 3, 2019in International Journal of Control 2.93
Xiaozhan Yang5
Estimated H-index: 5
('KCL': King's College London),
Hak-Keung Lam43
Estimated H-index: 43
('KCL': King's College London),
Ligang Wu57
Estimated H-index: 57
(HIT: Harbin Institute of Technology)
ABSTRACTTo find a unified approach for the stability analysis of second-order switched system, the concept of phase function is proposed in this paper. First, the basic properties of phase function are explored. Following this concept and its properties, the phase-based stability criterion is investigated based on the Lyapunov theory, and a necessary and sufficient stability condition is obtained in the phase function approach. Moreover, the connection between phase-based stability conditions an...
Likui Wang2
Estimated H-index: 2
(Nanchang Hangkong University),
Hak-Keung Lam43
Estimated H-index: 43
('KCL': King's College London)
In this technical paper, a new Lyapunov–Krasovskii functional (LKF) is designed to study the stability of continuous-time Takagi–Sugeno fuzzy systems with time-varying delay. The integrand of the LKF depends on integral variable and time {t}which can help to reduce the number of linear matrix inequalities (LMIs). Then, a new stability criterion is derived by analyzing the sign of the time derivatives of membership functions. Compared with the existing results, larger delay bounds can be obtai...
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