Control of managed pressure drilling systems using nonlinear predictive generalized minimum variance approach based on a Volterra model.

This paper proposes a nonlinear predictive generalized minimum variance (NPGMV) control scheme for automatic control of the managed pressure drilling (MPD) systems in the presence of disturbances. Since the exact model of the system is not usually available in practice, the hydraulic flow model of MPD is described by an autoregressive second-order Volterra model. The conventional least-squares method is applied to input-output data, thereby identifying the Volterra model.

Eigenvalue sensitivity-based analysis for evaluation of biological network stability versus disturbances.

Network modeling is an effective tool for understanding the properties of complex systems. Networks are widely used to help us gain insight into biological systems. In this way, the cell, gene, and protein are denoted as nodes, and the connection elements are regarded as links or edges.

H Static Output-Feedback Control Design for Discrete-Time Systems Using Reinforcement Learning.

This paper provides necessary and sufficient conditions for the existence of the static output-feedback (OPFB) solution to the H control problem for linear discrete-time systems. It is shown that the solution of the static OPFB H control is a Nash equilibrium point. Furthermore, a Q-learning algorithm is developed to find the H OPFB solution online using data measured along the system trajectories and without knowing the system matrices.

Multi-linear model set design based on the nonlinearity measure and H-gap metric.

This paper proposes a model bank selection method for a large class of nonlinear systems with wide operating ranges. In particular, nonlinearity measure and H-gap metric are used to provide an effective algorithm to design a model bank for the system. Then, the proposed model bank is accompanied with model predictive controllers to design a high performance advanced process controller.

Ethics: An Indispensable Dimension in the University Rankings.

University ranking systems attempt to provide an ordinal gauge to make an expert evaluation of the university's performance for a general audience. University rankings have always had their pros and cons in the higher education community. Some seriously question the usefulness, accuracy, and lack of consensus in ranking systems and therefore multidimensional ranking systems have been proposed to overcome some shortcomings of the earlier systems.

Stabilization of chaos systems described by nonlinear fractional-order polytopic differential inclusion.

In this paper, sliding mode control is utilized for stabilization of a particular class of nonlinear polytopic differential inclusion systems with fractional-order-0 < q < 1. This class of fractional order differential inclusion systems is used to model physical chaotic fractional order Chen and Lu systems. By defining a sliding surface with fractional integral formula, exploiting the concept of the state space norm, and obtaining sufficient conditions for stability of the sliding surface, a special feedback law is presented which enables the system states to reach the sliding surface and consequently creates a sliding mode control.

Decentralized supervisory based switching control for uncertain multivariable plants with variable input-output pairing.

In this paper, the design of decentralized switching control for uncertain multivariable plants is considered. In the proposed strategy, the uncertainty region is divided into smaller regions with a nominal model and specific control structure. The underlying design is based on the quantitative feedback theory (QFT).

Sufficient condition for stabilization of linear time invariant fractional order switched systems and variable structure control stabilizers.

This paper presents the stabilization problem of a linear time invariant fractional order (LTI-FO) switched system with order 1 View Article and Find Full Text PDF

Stabilization of multi-input hybrid fractional-order systems with state delay.

In this paper, the stabilization of a particular class of multi-input linear systems of fractional order differential inclusions with state delay using variable structure control is considered. First, the sliding surface with a fractional order integral formula is defined, and then the sufficient conditions for stability of the sliding surface are derived. Also, the concepts related to sliding control stabilization of differential inclusion systems with integer order are extended to differential inclusion systems with fractional order 0 View Article and Find Full Text PDF