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Article deals with the problem of simulation modeling of robust control system for nonlinear plants with the input signal saturation, functioning under a priori uncertainty conditions and in the presence of several statement delays. With the help of computational experiments, the quality of the control system operation under various initial conditions of the controlled plant is illustrated.
Consideration was given to construction of a robust control law for a class of scalar nonlinear dynamic plants under conditions of uncertainty and saturation of a control signal. The synthesis of the control law relies on the hyperstability criterion, L-dissipativity conditions and using in the main circuit an explicit reference model with two outputs and low-inertia filter-corrector.
The problem of variable structure guaranteed cost control for discrete uncertain networked systems with time delay has been considered in this paper. Based on the Lyapunov stability theorem, by introducing a discrete compensator, a novel sliding mode manifold that can compensate time delay has been designed. Then, by using linear matrix inequalities approach, a guaranteed cost controller is designed...
For a priori undetermined nonlinear multi-mode dynamic object with several statement delays and the relative order greater than one, it offers a combined adaptive control system, synthesized using the hyperstability criterion and L-dissipativity conditions.
In this paper, by using the delay partitioning approach, new stability criteria in terms of linear matrix inequalities are established for uncertain switched linear systems with delay. It is shown that the given method allows less conservative upper bound of delay as the number of delay partitioning increases. Numerical examples are also given to illustrate the main results.
This paper explores the impact ground delay can have on designing and executing rendezvous operations such as formation flight. For a given formation pairing the route is fixed, speed policies are then generated to compensate for uncertainty in take-off times. Value Iteration is used to solve both the deterministic and stochastic Dynamic Programming problem for an entire state-space. The final optimal...
The reduction model approach is useful for stabilizing linear systems with arbitrarily long input delays. Here we adapt the approach to time varying nonlinear systems whose nonlinear parts satisfy certain structural conditions. We use Lyapunov-Krasovskii functionals to prove local stability of the closed loop systems. We provide estimates of the basins of attraction, and cover uncertainties acting...
This paper addresses the controller design problem of time delay systems using discrete sliding mode control technique. In this, an optimal sliding surface is chosen as a linear function of the system states and the coefficients of sliding surface are computed by minimizing the quadratic performance index. A delay ahead predictor is used to handle system's time delay and plant-model uncertainties...
In this paper, the tracking control problem is investigated for a class of uncertain single-input single-output (SISO) linear time-invariant (LTI) systems. In a practical control system, uncertainties include parametric uncertainties, unmodeled dynamics, time delay and disturbances, which are too many and complicated to observe or know. By taking this into account, a new tracking controller design...
In many cases, demand for electricity can be viewed as demand for energy over a time horizon and not instantaneous demand for power (i.e., energy rate). Demand for energy translates to more flexibility in energy delivery. Assuming availability of proper information, which is promised by smart grids, this flexibility can be utilized to reduce costs for the consumers alongside providing other benefits.
The problem of reachable set bounding for a class of linear systems subject to both discrete and distributed delays is addressed in this paper. First, a new criterion is derived to give an ellipsoid which bounds all the states starting from the origin by inputs with peak-values. The constraint with a special structure that appeared in our previous result is removed by combining the Jensen integral...
Handling delays and uncertain parameters in control systems is difficult and of long-standing interest. In this paper, we consider the problem of stabilizing any single-input single-output (SISO) linear time invariant (LTI) controllable/observable plant with an arbitrarily large uncertain gain and time delay; to do so, we propose a non-linear time varying (NLTV) controller. Despite being NLTV, the...
A new architecture for model-based control of unstable and uncertain systems with network induced delays, and for set-point tracking over networks, is presented in this paper. This setup provides better performance than similar approaches in terms of steady-state tracking error and reduction of network traffic by transmitting measurement updates only when necessary. The results in this paper also...
This paper presents a new robust sliding mode control (SMC) method for uncertain stochastic systems with time-varying delay, structural uncertainties and the Brownian noise. The proposed method applies singular value decomposition (SVD) to all the structural uncertainties, and introduces adjustable parameters for control design. Then, a less-conservative condition of robust stability and new robust...
In this paper we derive sufficient conditions for passivity of neutral type time delay systems (TDS) with time varying parametric uncertainties. The delays in states and state derivatives are assumed to be time varying. Delay dependent sufficient conditions for robust passivity, are derived in terms of Linear Matrix Inequalities (LMIs). Feedback control law is formulated for robust passification of...
Device-delay errors in interactive systems is critical in modeling user-interfaces. A novel formalism is created to model device-delay using a resource-based approach. The formalism is able to incorporate uncertainty in device-delay for interactive systems.
The robust stability of uncertain neutral systems with time-varying and distribute delays is investigated. The robust stability criterion is proposed based on Lyapunov-Krasovskii and free weight matrices methods, we derive a new stability criterion. Finally, the numerical example was given to illustrate the effectiveness of the method.
With the characteristics of wide time span, engineer-to-order, advanced technology to be adopted", "etc., Complex product systems (CoPS) innovation becomes a systematic project full of risks. Risk evaluation is the vital role in life-cycle process of the CoPS. Furthermore, the technical risk is major factor leading to cost, time and effectiveness risk. Because of the non-structural features...
In this paper researched precise accurate Time Stamping for positioning. Though existing Time Stamping only executed at the WLAN MAC layer, this paper suggest time stamping method using the additional TPU to minimize messages transmit delay for precise time detection between MAC and PHY.
High-voltage power metering systems based on electronic instrument transformers (EITs) have some advantages compared to the conventional ones. This paper describes an unique calibration method and device for the power metering system. High accuracy with the calibration method can be achieved. The estimated relative uncertainty of the device is about 200×10−6 in magnitude and less than 110 µrad in...
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