Arild Thowsen

Iowa State University

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Will Perkins

Georgia Institute of Technology

William Collins

Virginia Tech

P. A. Thollot

MicroTransponder (United States)

Charles Lemaire

Georgia Institute of Technology

Fred C. Lee

Virginia Tech

Stephen Waiker

Georgia Institute of Technology

John D. Nordgard

Georgia Institute of Technology

William Burns

National Institute of Standards

Robert H. Friedman

Boston Medical Center

Julie Ellis

Tel Aviv University

Cooperative Institutions

Georgia Institute of Technology

Glenn Research Center

Lockheed Martin (Canada)

Virginia Tech

Digital Equipment (Germany)

Kyushu University

Massachusetts Institute of Technology

Duke University

National Institute of Standards

National Institute of Standards and Technology

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Analysis and control of time-delay systems using finite dimensional approximations

Computers & Electrical Engineering (1981)

Arild Thowsen

Approximations of π

Finite difference

Delay differential equation

Presentation (obstetrics)

10.1016/0045-7906(81)90014-8

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Computer control for low-order time-delay systems†

International Journal of Systems Science (1980)

Arild Thowsen

Sampled-data control of low-order continuous-time dynamic systems with time delays is considered. A class of controllers which will transfer the state of the infinite dimensional delay system to the zero state in finite time is determined. The control algorithms require very little data storage and are easily implemented on any digital computer.

10.1080/00207728008967070

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Memoryless stabilization of linear delay-differential systems

IEEE Transactions on Automatic Control (1981)

A. Feliachi Arild Thowsen

Sufficient conditions for memoryless feedback stabilization of linear time-invariant delay-differential systems are derived for both constant and time-dependent delays.

LTI system theory

Constant (computer programming)

Delay differential equation

10.1109/tac.1981.1102653

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Citations (80)

Uniform ultimate boundedness of the solutions of uncertain dynamic delay systems with state-dependent and memoryless feedback control

International Journal of Control (1983)

Arild Thowsen

A continuous feedback controller is developed for a class of non-linear, time-varying, uncertain systems governed by functional differential equations with retarded arguments. The form of the controller guarantees that under certain assumptions all solutions are uniformly bounded in norm for time t sufficiently largo in spite of the uncertainty in system parameters and input signals. Furthermore, given any ϵ > 0, the parameters in the description of the controller can be chosen such that the closed-loop solutions all satisfy ||x(t)|| ≤ ϵ for large t.

Feedback controller

Feedback Control

10.1080/00207178308933035

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Citations (97)

Structural identifiability

Arild Thowsen

The structural identification problem in dynamic systems is reviewed and new conditions for global identifiability of linear systems are obtained.

Identifiability

Identification

10.1109/cdc.1977.271745

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Delay-independent asymptotic stability of linear systems

IEE Proceedings D Control Theory and Applications (1982)

Arild Thowsen

Necessary and sufficient conditions for linear time-invariant systems with multiple delays to be asymptotically stable independent of the length of the delays are determined

10.1049/ip-d:19820015

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Citations (41)

Observability conditions for a class of mixed distributed and lumped parameter systems

Automatica (1976)

Arild Thowsen Will Perkins

Observability

Distributed parameter system

10.1016/0005-1098(76)90028-5

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Citations (1)

Further comments "Stability of time-delay systems"

IEEE Transactions on Automatic Control (1983)

Arild Thowsen

A corrected version of an earlier theorem on the asymptotic stability of \dot{x}(t) = A_{1}x(t)+ A_{2}x(t - h) is presented.

10.1109/tac.1983.1103355

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Citations (5)

Sampled-data linear-quadratic regulator for systems with generalized transportation lags†

International Journal of Control (1975)

Arild Thowsen Will Perkins

A complete solution to the sampled-data linear-quadratic regulator problem for systems with generalized transportation lags is presented. Linear feedback laws are shown to be optimal under a general quadratic cost which allows regulation of both the lumped and distributed subsystems. The optimal feedback gains are determined as solutions to recursive matrix equations which can be solved off-line.

Matrix (chemical analysis)

10.1080/00207177508921969

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Citations (4)

Committees

William Collins Martin Corporation William Burns Fred C. Lee John D. Nordgard

10.1109/pesc.1980.7089419

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