Showing papers on "Sliding mode control published in 1982"
TL;DR: In this article, a control scheme to reduce the mismatch in power generation and consumption of electric power systems is developed using the variable structure systems concept, which is introduced to refine the dynamic properties of the presently used integral controller which has been originated in accordance with a steady state concept.
Abstract: A control scheme to reduce the mismatch in power generation and consumption of electric power systems is developed using the variable structure systems concept. This scheme is introduced to refine the dynamic properties of the presently used integral controller which has been originated in accordance with a steady state concept. The new controller changes its structure according to a certain logic which results in distinct advantageous properties.
173 citations
TL;DR: The discrete adaptation algorithm which randomly samples filtered versions of the plant input and output signals, and periodically updates the controller parameters, is shown to produce a stable closed loop system for any average sampling rate.
Abstract: In this note a method is presented for doing discrete adaptive control of continuous time systems. Rather than make the entire compensator discrete, the compensator is separated into a continuous time adjustable control structure and a discrete time adaptation mechanism for updating the controller parameters. The discrete adaptation algorithm which randomly samples filtered versions of the plant input and output signals, and periodically updates the controller parameters, is shown to produce a stable closed loop system for any average sampling rate.
75 citations
TL;DR: In this paper, a simple procedure for obtaining stabilization of a class of continuous and discrete linear systems subjected to control structure constraints is presented, giving more attention to the so-called decentralized control.
Abstract: In this paper we present a simple procedure for obtaining stabilization of a class of continuous and discrete linear systems subjected to control structure constraints, giving more attention to the so-called decentralized control. Contrary to the continuous case where much work has been done, the solution presented here for the discrete case is one of the first to be presented. Some examples are treated and, for the continuous case, some comparisons are made with other methods found in the literature.
44 citations
TL;DR: In this paper, a new geometric method of calculating multivariable system zeros and zero directions is presented by considering a particular choice of state feedback control law, motivated by the study of variable structure systems in the sliding mode.
Abstract: A new geometric method of calculating multivariable system zeros and zero directions is presented by considering a particular choice of state feedback control law. This control law has been motivated by the study of variable structure systems in the sliding mode. The cases of singular and non-singular CB have been treated separately.
31 citations
TL;DR: A sufficient condition for the existence of control to generate a given real analytic function as the output of a large class of multivariable nonlinear control systems is derived in this paper.
Abstract: A new sufficient condition for the existence of control to generate a given real analytic function as the output of a large class of multivariable nonlinear control system is derived. Furthermore, a prefilter (right-inverse system) is constructed to generate the required control.
29 citations
TL;DR: In this paper, the basic control structure consists of program (nominal) control and compensating term, which should provide for nominal trajectory tracking under initial-condition perturbations.
Abstract: By digital simulation of an elementary functional movement for the manipulation system with six rotational degrees of freedom, a few dynamic control algorithms are investigated. The basic control structure consists of program (nominal) control and compensating term, which should provide for nominal trajectory tracking under initial-condition perturbations. As compensating control in the stage of perturbed regimes, the following were observed: (1) decentralized control, that is, local linear control law on the each actuator subsystem level; (2) suboptimal control, where the linear term is the same as local control, but "global" term takes into consideration the disturbance acting upon the subsystem as the result of coupling with other subsystems; (3) control law consisting of linear local control and nonlinear compensator, synthesized using Liapunov's second method. Those control laws are compared with respect to stability, tracking, energy consumption, and computational efficiency.
27 citations
14 Jun 1982
TL;DR: In this paper, the design principles of sliding mode control are studied, and then are applied to speed reguration of a dc motor drive, each step in the formulation of the control algorithm is clearly defined and explained.
Abstract: The design principles of sliding mode control are studied, and then are applied to speed reguration of a dc motor drive. Each step in the formulation of the control algorithm is clearly defined and explained. The feasibility of this control scheme is experimentally verified. The control strategy is implemented by recently improved analog IC components. The proposed controller is robust in both dynamic and steady state performances and provides extremely good speed reguration independent of system parameter variations and external disturbances. In addition to this, a certain algorithm obtained by rotating the sliding curve adaptively is extensively applied in order to achieve the sub-time optimal control.
16 citations
14 Jun 1982
TL;DR: In this paper, the authors examined the application of variable structure control theory to the design of a flight control system for the AV-8A Harrier in a hover mode, where variable structure design is to confine the motion to a subspace of the total state space.
Abstract: This paper examines the application of variable structure control theory to the design of a flight control system for the AV-8A Harrier in a hover mode The objective in variable structure design is to confine the motion to a subspace of the total state space The motion in this subspace is insensitive to system parameter variations and external disturbances that lie in the range space of the control A switching type of control law results from the design procedure The control system was designed to track a vector velocity command defined in the body frame For comparison purposes, a proportional controller was designed using optimal linear regulator theory Both control designs were first evaluated for transient response performance using a linearized model, then a nonlinear simulation study of a hovering approach to landing was conducted Wind turbulence was modeled using a 1052 destroyer class air wake model
16 citations
TL;DR: In this paper, for parameter-adaptive control of nonlinear single input/single output processes various nonlinear control algorithms are presented, which can be designed with small computational expense from nonlinear parametric process models based on Volterra-series.
13 citations
14 Jun 1982
TL;DR: An algorithm for adaptive control of continuous time single-input single-output systems is presented that involves a continuous as well as a discrete time part, instead of being totally discrete or totally continuous as in previous approaches.
Abstract: In this report, an algorithm for adaptive control of continuous time single-input single-output systems is presented. With the hybrid approach, the control structure involves a continuous as well as a discrete time part, instead of being totally discrete or totally continuous as in previous approaches. The system is sampled and the adaptive gains updated at a variable rate varying with the magnitude of the error itself.
6 citations
01 Dec 1982
TL;DR: In this paper, a complete solution to the standard inverse problem of optimal control is established, and the optimality of a feedback control law is characterized completely in terms of a new geometric condition as well as the well-known return difference condition.
Abstract: A complete solution to the standard inverse problem of optimal control is established. The optimality of a feedback control law is characterized completely in terms of a new geometric condition as well as the well-known return difference condition. A procedure is also proposed for determining all quadratic costs minimized by a given feedback control.
01 Dec 1982
TL;DR: In this paper, the non-uniqueness of the optimal stationary filter and control gains for the LQG case was demonstrated for both finite and infinite time horizons, and necessary and sufficient conditions for optimal linear control were derived.
Abstract: Necessary conditions for optimal linear control have been derived over finite and infinite time horizons. Non-uniqueness of the optimal stationary filter and control gains is demonstrated for the LQG case.
14 Jun 1982
TL;DR: In this paper, a control theory for a large class of nonlinear systems, including analog, digital, and hybrid systems, is presented, which can be used to model non-linear systems that cannot be modeled with the state space equations.
Abstract: This paper presents a control theory, for a large class of nonlinear systems, including analog, digital, and hybrid systems. The control theory is developed from a new system model that can be used to model nonlinear systems that cannot be modeled with the state space equations.