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The act-and-wait control introduced by Insperger is shown to be related to a form of intermittent control. Theoretical and practical similarities and differences between the two methods are explored.
In practice, there exist such controlled systems in which some states are often not available, not measurable or too expensive to measure. For such systems, impulsive control inputs may be exerted on the available partial states so as to stabilize the underlying systems. This paper is concerned with analyzing the stability of a class of nonlinear time-delay systems with partial states subject to impulsive...
This paper aims to design a controller to robustly stabilize uncertain nonlinear systems with time-varying delay and norm bounded uncertainties via Takagi-Sugeno (T-S) fuzzy model. The stabilization conditions are given in the form of linear matrix inequalities using a single Lyapunov-Krasovskii functional (LKF) combining the introduction of some relaxation matrices and only one tuning parameter....
This paper deals with a designing problem of nonlinear discrete-time and discrete-value (discretized) control systems on an integer grid. Especially, in this study, robust stabilization based on the discretized PID control accompanied with transmission delay is discussed. The transmission delay is assumed to be uncertain and varying within prescribed bounds. The robust stabilization is examined in...
Lyapunov-Krasowskii functionals are used to design quantized control laws for nonlinear continuous-time systems in the presence of time-invariant constant delays in the input. The quantized control law is implemented via hysteresis to avoid chattering. Under appropriate conditions, our analysis applies to stabilizable nonlinear systems for any value of the quantization density. The resulting quantized...
This paper presents an overview of proportional-integral-derivative (PID) controller and it's tuning. Two systems are selected for study. One is higher order system and the other is first order system with time delay. The performance of PID tuning techniques is analyzed on the basis of frequency response parameter that is phase margin. Simulation results are presented and performances of different...
Fundamental performance limitations on congestion control is discussed in relation to the information that is available in the controller. Three control architectures that all use bottle-neck buffer delay information of various form as inputs and sending rate as outputs are considered. It is shown that feedback delays from buffer to senders set limits on the achievable performance measured through...
This paper presents a new stability analysis of linear networked control systems. The new method is inspired by discontinuous Lyapunov functions that were introduced by using impulsive system representation of the sampled-data and of the networked control systems respectively. In the recent paper piecewise-continuous (in time) Lyapunov-Krasovskii functionals have been suggested for the stability analysis...
This paper is concerned with the stabilization problem of networked control systems where the main focus are the packet-loss, time delays and unmeasured system states. Here a state observer is designed for estimating the states and compensating for time delay and data dropout, then the whole closed system is modeled as asynchronous dynamical system constrained by configuration event rate. By using...
Predictive model following control mechanical engineering control system can output general signals following the desired ones. In this paper, a method of predictive system will be extended to be a design of linear system with time-delay. The bounded property of the internal states for the control is given and the utility of this control design is guaranteed. Finally, a numerical example is given...
Model following control system (MFCS) can output general signals following the desired ones. In this paper, a method of nonlinear model following control system will be extended to be a nonlinear system in discrete time. The nonlinear system studied in this paper has the property of norm constraint ?? f (v(t)) ?? ???? + ????v(t)????, where ?? ?? 0, ?? ?? 0, 0 ?? ?? ?? 1. In this case, a new criterion...
According to the characteristics of long time-delays, large inertia and time-variation in the dissolved oxygen control method of sewage treatment, one fuzzy-Smith control model on dissolved oxygen control is presented in this paper. This model has the merits of a high robustness in fuzzy controller and a compensation for time delay in Smith predictor. After simulation experiment, the result is shown...
Signal transmission in control structures is usually characterized by propagation processes, i.e. existence of time delays. For the interpolative-type control structures the problem is often disregarded, especially in the design step. Undoubtedly, the effect consists in worse real performances that those designed. In this context, the present paper proposes and presents a solution able to compensate,...
This work presents a reset/hybrid control application of an in-line pH process. The nonlinear process dynamic is linearized around different operation points, and as a result a second order plus dead time (SOPDT) plant with uncertain gain is obtained for control purposes. A standard PI compensator and a reset compensator are designed and tuned. The main result of this work will be to compare the performance...
In this paper, the passivity analysis of neutral fuzzy systems with delays and bounded uncertainties is considered. Based on Lyapunov-Krasovskii functional, the LMI approach and the descriptor system approach, sufficient conditions for passivity are obtained. Finally, a simulation example is provided to demonstrate effectiveness and applicability of the theoretical results.
Compressed air powered engine is a type of zero-pollution engine, but its conversion efficiency is very low for its high pressure exhaust which causes much exergy loss. In this study, a control system was developed to reduce the exhaust pressure of vehicle compressed air powered engine. The control system is made up of a controller, a pressure sensor, a photoelectric encoder, an inlet solenoid valve,...
Nowadays IMC-PID is widely used in industrial field, but time delay problem is an unavoidable problem existing in IMC-PID design. First order Pade approximation, second order symmetric Pade approximation and second asymmetric Pade approximation are usually adopted to approximate time delay item, but these three approximation methods may bring zero-points to the system during approximation, and bring...
The vibration control of flexible object that has multiple modes is studied in this paper. Two EI shapers based on Zero-placement technique are introduced firstly and then they are used to reduce the residual vibration of flexible structure. Different from the available method, this method does not design shaper for every mode but design a shaper based on nominal mode so all modes locate on the allowable...
Automated composition of services is a key functionality for the adoption of the service-oriented development paradigm. Solving this problem in practice requires the ability to consider asynchronous stateful services and to express complex composition requirements which may span different phases of the life-cycle of component services. In this paper we present a novel automated service composition...
Petri nets are a powerful recognized formalism for the specification and verification of concurrent systems. To deal with systems whose time issues become fundamental, different time Petri nets extensions have been developed in the literature, each one being dependent on the application considered. For time critical systems their correctness depends not only on the logical one but also on the time...
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