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In this work we consider stability of singularly perturbed nonlinear systems affected by time-delays. In particular, we consider the case when trajectories of the boundary layer system of such a system converge to a compact set. By combining the averaging method and the Lyapunov-Razumikhin approach, we obtained sufficient conditions for semi-global and practical stability based on conditions of the...
Testing of web service orchestrations brings new challenges to developers of Service-Oriented Applications (SOA) due to their dynamic nature and missing control over underlying infrastructure. The current testing approaches and tools cover single testing activities such as test path analysis, test case generation, web service emulation, fault injection, etc. There is still a lack of solutions that...
Two memoryless adaptive observers are proposed for systems with unknown time-delays and nonlinearities, in which time-delays are not used in the observer. Using high order neural networks (HONN), the precise system model, the Lipschitz, linear-in-parameter or norm-bounded assumptions of nonlinear functions are not needed. A robust term based on the matching condition is introduced in the first observer,...
Nowadays, many new polymer materials have been widely used in different chemical production areas. The polymerization temperature is an important parameters of process control, but has characteristics of time-delay and inertial, so the ordinary PID control is difficult to obtain good effect. In order to control the system steadily and accurately, we suggest a compound control method, which combines...
This paper develops an adaptive controller for (wireless) networked control systems by combining delay estimation and a jitter margin based PID controller tuning. A control system with wireless measurement is assumed, where the network induces delay jitter. Two delay jitter estimation algorithms are developed, with a method for selecting only valid delay estimates. The delay jitter adaptive PID controller...
In this paper, a new approach to evaluate the response time in Ethernet-based automation systems using client server protocols, is presented. It is based on modeling the behaviour of the system using timed event graphs and the resulting state representation in max-plus algebra. First, an algorithm for tracking the frames in the architecture and giving the response time relative to any occurring event...
This paper proposes a neural network based traffic signal controller, which eliminates most of the problems associated with TRPS mode of the closed loop system. Instead of storing timing plans for different traffic scenarios, which requires clustering and threshold calculations, the proposed approach uses an ANN model that produces optimal plans based on optimized weights obtained through its learning...
This papers proposes a novel climate control strategy for mine extraction rooms based on the receding horizon optimal control scheme. Being a model-based procedure, the development of a pertinent prediction model is one of the keystones. According to recent technological advances, we consider that distributed measurements are available and provided by a wireless network. An enhanced modeling approach,...
In a dual-armed cluster tool, the swap operation method that exchanges a wafer on a robot arm with another wafer at a chamber has been mostly used. It is known to minimize the tool cycle time although it restricts the robot task sequence. Recent cluster tools have new scheduling requirements such as reentrant wafer flows for atomic layer deposition processes, constraints on the wafer delay times within...
Networked control systems (NCS) are an active area of research within control and estimation. Networked control systems have many advantages by comparison with the traditional ones. The fault detection problem is studied in this paper for a class of linear networked control systems (NCS) with communication delays. Aim is to generate residual signals which, in the fault free case, are supposed to be...
This paper deals with the physical modeling and the digital time simulation of acoustic pipes. We will study the simplified case of a single convergent cone. It is modeled by a linear system made of delays and a transfer function which represents the wave reflection at the entry of the cone. According to [1], the input/output relation of this system is causal and stable whereas the reflection function...
This paper focuses on the fragility analysis of PI-controllers for single-input-single-output (SISO) systems subject to input (or output) delays. Using a geometric approach, we present a simple and user-friendly approach not only to analyze the fragility of PI controllers, but also to provide practical guidelines for the design of non-fragile PI controllers. The proposed methodology is illustrated...
This contribution deals with design of controllers for integrating processes with time delay. In contrast to many other methods, the proposed method is not based on the time delay approximation. A control structure combining standard 1DOF and 2DOF control structures is considered. The control design is performed in the RMS ring of retarded quasipolynomial (RQ) meromorphic functions - an algebraic...
A geometric approach to the disturbance decoupling problem for linear neutral systems with a finite number of commensurable point delays is investigated and necessary and sufficient conditions for its solution are given. Using as models neutral linear systems with coefficients in a ring, new invariant submodules are defined together with algorithmic procedures for their computation. Examples are worked...
The problem of robust disturbance rejection is studied for the case of linear parameter varying (LPV) uncertain systems. The problem is solved using a proportional time varying state feedback controller of particular type being independent from the uncertainties. Sufficient, solvability conditions for the problem of robust disturbance rejection of the LPV uncertain system, are established. Under,...
In a companion paper we have presented a practical formation motion control scheme for robotic swarms based on single view depth estimation. In this paper we adapt this control scheme to the cases where there are obstacles to be avoided in the region of interest. First, a set of distributed control laws for the agents, to be incorporated with depth (distance) estimation scheme, are introduced to move...
The paper proposes a method for feedback stability evaluation for discrete-time, linear time-varying control systems. It is assumed that the time-varying system can be described by linear matrices operators, equivalent to general discrete-time, time-varying state space model with nonzero input-output delay. The main used tools are Bode diagrams approximated for time-varying systems, using power spectral...
It is well-known that the interconnection of two or more dynamical systems leads to an increasing complexity of the overall system's behavior due to the effects induced by the emerging dynamics (in the presence or not of feedback loops) in strong interactions (sensing, communication) with the environment changes. One of the major problems appearing in such interconnection schemes is related to the...
The purpose of this paper is to achieve a quantum leap in teleoperation experiments with real devices in laboratory environments. It intends to replace current simulations of networks with time delays - which are usually represented as black boxes (Kamrani, 2005) in software applications such as Matlab or Scilab - with a simple and universal element capable of reflecting, in real time, the state of...
This paper provides some qualitative results concerning the asymptotic stability of some dynamical systems encountered in biochemical networks. We adopt a frequency-domain approach combined with a simple geometric interpretation and we give a complete characterization of the dynamical behavior of the linearized system under consideration. The conclusion of the analysis can be resumed as follows: the...
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