Controllability Of Neutral Systems Research Articles

TJ-II neutral beam injectors control and data acquisition system

The Control and Data Acquisition System for the Neutral Beam Injectors of TJ-II are described in this paper. The DAQ and Control architecture is based on a distributed system including VME-OS9 real-time computers and personal computers (PCs) with Linux and Windows NT. One OS9-VME local computer located near each injector performs the timing, local signal processing, signal interlock, and operation of the injector mechanical and electrical components. A main OS9-VME interfaces and controls some peripheral systems, such as the high voltage power supplies, water cooling, safety and protection systems. Control is performed from the OS9-VME machines, in which the software elements are basically C/C++ programs performing real time processing and a web server enabling access to the HTML pages acting as user graphic interface.

3306 AMDによる超高速エレベータの振動制御 : ゲイン切り換え機構の検討(OS4 高速化とサービス向上)

Skyscrapers require installment of high-speed elevators. As the elevators become faster, their ride comfort worsens because of cabin vibration due to disturbance. Therefore, an active vibration control system is often utilized to improve the ride comfort. In this study, a vibration control system and a neutral position control system are designed based on optimal control theory using the Active Mass Damper (AMD) to improve the ride comfort and prevent incorrect movement of the AMD. This report investigates the effect of a variable gain control on the movement of the AMD using computer simulation.

Survey of adaptive dual control methods

A survey of adaptive dual control methods, elaborated from the early 1960s until the present, is given. The development of dual control methods is considered in chronological order, taking into account its close interconnection with general progress in adaptive control theory and applications. Detailed classifications of stochastic adaptive control methods and dual control methods are presented. The properties of a neutral control system and the nature of the dual effect in adaptive control systems are described. The historical stages of the development of the theory and applications of dual control are reviewed.

The unconditional stability for the multigroup multidelays neutral type linear constant control system

Applying the frequency domain method and the inequality method, we discussed the unconditional stability problem of the multigroup multidelays neutral type linear constant continuous control system, and obtained some sufficient conditions.

Structure and stabilization of delayed neutral nonliear interconnected control systems

Some new concepts of the structure are established for the multi-group multi-delays neutral nonlinear interconnected control system. A posi-tive definite quadratic form V-function via choosing the symmetric positive definite solution matrix of Riccati matrix differential equation is made up. On the base of the equivalence method of Lyapunov's function found, A sufficient criteria is obtained for the interconnected stabilization of the control system without delays and perturbation parameters imply the interconnected stabi-lization of the multi-group multi-delays and perturbation parameters neutral nonlinearinterconnected control system. At the same time, some estimate formulae of the bounded for both time-delays and perturbation parameters are given.

Fundamental principle and synthesis of variable structure control for nonlinear neutral control systems with time-delays *

Abstract This paper investigates the practicality problem of the equivalent control method for nonlinear neutral type variable structure control system (VSCS) with time-delays. Existence of the sliding mode for the system is given, and the conditions under which the sliding process has nothing to do with the external disturbance and parameter perturbation are obtained. At last, the synthetical method of the VSCS is provided and illustrated by an example of chemical process.

Optimal regulator for neutral control systems with multi-delays

Abstract With optimal regulator problem for neutral control systems with multi-delays is considered. For neutral system with multi-delays, Riccati type partial differential equations are given. Optimal regulator is structured by using the solutions of the Riccati type partial differential equations. Some closed-loop properties of the optimal regulator are also obtained.

Constrained Feedback Control of Imperfectly Known, Linear, Time-Delay Systems of Neutral Type

Abstract A class of robust continuous feedback controls, with memory, is synthesized and a delay-free stability criterion is presented for a class of imperfectly known time-delay systems of the neutral type, when there are constraints on the control input. The uncertain systems are modelled as nonlinear perturbations to a known linear neutral time-delay control system and, as well as being time and state dependent, the nonlinear perturbations are assumed to be state delay-dependent and input dependent. Moreover, prior information on the bound of the system uncertainty is required. A deterministic approach is taken and, using a Lyapunov-Krasovskiĭ functional, a global uniform asymptotic stability property is investigated for the class of systems.

Compactness and convexity of cores of targets for neutral systems

In this paper we prove the convexity and the compactness of the cores of targets for neutral control systems. We make use of a weak compactness argument; but in the crucial part where we establish the boundeduess of the cores of the target we make use of the notion of asymptotic direction from convex Set Theory. Let En be n-dimensional Euclidean space. We prove that the core of the target H = L + E (where L = {x ∈ En | Mx = 0}, M is a constant in m × n matrix and E is a compact, convex set containing 0) of the neutral systemis convex, and is compact if, and only if, the systemis Euclidean controllable.

The TFTR Neutral Beam Control and Data Acquisition System

This paper describes the compater control and data acquisition system for the Tokamak Fusion Test Reactor (TFTR) Neutral Beam injectors. The system provides hardware and software to permit remote operation of the four beamlines on TFTR, each containing up to three ion sources, and for a single-source beamline for the TFTR test stand.

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Approximate controllability of neutral systems with delays in control

In this paper we examine approximate controllability in the space IV: x L* of linear neutral systems with general delays in states and controls. We define spectral controllability and completability of such systems and prove that these properties together are equivalent to the approximate controllability in Wt x L*. We give necessary and sufficient conditions for the approximate controllability which extend recent results of Manitius [9] to neutral systems with delays in control. Let us consider a linear neutral control system described by the following functional-differential equation

Approximation schemes for nonlinear neutral optimal control systems

We discuss methods of approximating stable neutral functional differential equations and associated optimal control problems by sequences of optimal control problems for ordinary differential equations. By introducing a class of “mollified” neutral functional differential equations, convergence of the linear interpolating spline and the averaging approximation scheme is proved. A number of numerical examples are included.

Optimal control of neutral systems

This correspondence considers the necessary conditions for optimal control of a nonlinear neutral system with general cost function. Using variational techniques, it is shown that the adjoint variable is discontinuous, and furthermore, the form of the discontinuity is characterized.

Suboptimal control of neutral systems

Abstract The usual approach for obtaining the optimal control for a neutral system with quadratic cost consists of first deriving a set of necessary conditions for optimality and then using conventional iterative numerical methods to find a control satisfying those conditions. The burden of computation in this approach is enormous. The suboptimum iterative scheme proposed in this paper does not proceed along those lines. Instead, the neutral system is first converted into a non-linear time-delay system. The non-linear delay term is then treated like an extra perturbing input. A linear non-delay system is optimized at each stage and the resulting sequence of control functions converges rapidly to a suboptimal control for the original problem. One numerical example illustrates the technique

Optimal control of neutral systems†

A method is presented whereby an optimal control may be obtained for a linear time-varying neutral system. The performance measure is quadratic with fixed finite upper limit. A form is derived for the coat functional, and the optimal control is obtained as the solution to a set of differential equations. A numerical technique for the solution of the equations is given and existence and uniqueness are proven.