William Garrard - Academia.edu (original) (raw)

Papers by William Garrard

Research paper thumbnail of Stochastic Observability Test for Discrete-Time Kalman Filters

Journal of Guidance, Control, and Dynamics, 2009

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Research paper thumbnail of Parameter Varying Control of a High-Performance Aircraft

Journal of Guidance, Control, and Dynamics, 1997

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Research paper thumbnail of Sur la synthèse des systèmes sub-optimaux de commande d'attitude à roues inertiellesZur synthese von suboptimalen trägheits-lage-regelungssystemenO cинтeзe cyбoптимaльных cиcтeм пoзициoннoгo yпpaвлeния c инepциoнными кoлecaми

Automatica, 1969

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Research paper thumbnail of Application of inflation theories to preliminary parachute force andstress analyses

11th Aerodynamic Decelerator Systems Technology Conference, 1991

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Research paper thumbnail of Additional results on sub–optimal feedback control of non–linear systems†

International Journal of Control, 1969

... GARRARD, W. L., MCCL ~ OOH , NH, and CLARK, LG, 1967, Int. J. Control, 5,425. liA~nm~, R. E.,... more ... GARRARD, W. L., MCCL ~ OOH , NH, and CLARK, LG, 1967, Int. J. Control, 5,425. liA~nm~, R. E., 1960, Boln Soc. mat. mex., 5, 102. LEE, EB, and MARKUS, L., 1967, Foundations of Optintul Control Theory (John Wiley). LURES, D., 1967, Ph.D. Thesis, University of Minnesota. ...

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Research paper thumbnail of Dynamics and control of tailless aircraft

22nd Atmospheric Flight Mechanics Conference, 1997

Recently there has been considerable interest in the development of aircraft which have reduced v... more Recently there has been considerable interest in the development of aircraft which have reduced vertical tail size compared with conventional aircraft. The tail of an aircraft produces a large radar signature and the requirement for stealth in new military aircraft necessitates the design of ...

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Research paper thumbnail of Piecewise-constant guidance for aeroassisted maneuvers

Aiaa Atmospheric Flight Mechanics Conference, 1992

This paper proposes the use of piecewise constant control in aeroassisted orbital transfers. Aero... more This paper proposes the use of piecewise constant control in aeroassisted orbital transfers. Aeroassisted orbital transfers can be achieved in practice through direct lift modulation or bank angle modulation. Practical implementation prefers constant lift coefficients. On the other hand, controls need to vary in order to cope with uncertainties in the atmosphere. As a result, piecewise constant lift or bank modulation presents a practically useful form. In this paper, several related problems in using piecewise constant lift control are discussed. In particular, the energy is used as the independent variable, and maps of state variables achievable with constant lift controls are provided.

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Research paper thumbnail of Application of Eigenspace Techniques to Design of Aircraft Control Systems

1985 American Control Conference, Jun 19, 1985

Eigenspace techniques allow the control system designer to use feedback to place eigenvalues and ... more Eigenspace techniques allow the control system designer to use feedback to place eigenvalues and shape eigenvectors so as to modify closed loop dynamic response characteristics to achieve performance objectives. In this paper the theory of eigenspace design is reviewed, extended and applied to several aircraft control problems.

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Research paper thumbnail of Eigenspace techniques for active flutter suppression

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Research paper thumbnail of Application to Parameter Dependent Robust Control Synthesis to Turbofan Engines

Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) syste... more Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) systems are applied to the control of a turbofan engine over a wide range of power codes. Seven linear, time-invariant models are used in the control design. The resulting LPV ...

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Research paper thumbnail of Application of parameter-dependent robust control synthesis to turbofan engines

36th AIAA Aerospace Sciences Meeting and Exhibit, 1998

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Research paper thumbnail of Design of a robust dynamic inversion lateral/directional flight controller

Guidance, Navigation, and Control Conference, 1995

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Research paper thumbnail of A new technique for design of controllers for turbofan engines

34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998

Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) syste... more Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) systems are applied to the control of a turbofan engine over its entire range of operation. Ten linear, time-invariant models are used in the control design. An LPV model of the turbofan ...

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Research paper thumbnail of Design of a Helicopter Control System to Meet Handling Quality Specifications Using H∞ Techniques

Proceedings. The First IEEE Regional Conference on Aerospace Control Systems,, 1993

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Research paper thumbnail of Design of a helicopter control system to meet handling quality specifications using H(infinity) techniques

Guidance, Navigation and Control Conference, 1993

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Research paper thumbnail of Implicit and explicit model-following helicopter flight controllers

Guidance, Navigation, and Control Conference, 1994

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Research paper thumbnail of On linear modelling of non-linear systems†

International Journal of Control - INT J CONTR, 1972

In many cases of interest, systems described by non-linear differential equations are modelled by... more In many cases of interest, systems described by non-linear differential equations are modelled by linear equations for purposes of synthesizing feedback controllers. A theorem relating the stability properties of the linear model and the non-linear system is presented and discussed.

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Research paper thumbnail of Design of a Multivariable Helicopter Flight Control System for Handling Qualities Enhancement

Journal of the American Helicopter Society, 1990

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Research paper thumbnail of Application to Parameter Dependent Robust Control Synthesis to Turbofan Engines

Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) syste... more Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) systems are applied to the control of a turbofan engine over a wide range of power codes. Seven linear, time-invariant models are used in the control design. The resulting LPV ...

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Research paper thumbnail of Application of Parameter-Dependent Robust Control Synthesis to Turbofan Engines

Journal of Guidance, Control, and Dynamics, 1999

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Research paper thumbnail of Stochastic Observability Test for Discrete-Time Kalman Filters

Journal of Guidance, Control, and Dynamics, 2009

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Research paper thumbnail of Parameter Varying Control of a High-Performance Aircraft

Journal of Guidance, Control, and Dynamics, 1997

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sur la synthèse des systèmes sub-optimaux de commande d'attitude à roues inertiellesZur synthese von suboptimalen trägheits-lage-regelungssystemenO cинтeзe cyбoптимaльных cиcтeм пoзициoннoгo yпpaвлeния c инepциoнными кoлecaми

Automatica, 1969

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Research paper thumbnail of Application of inflation theories to preliminary parachute force andstress analyses

11th Aerodynamic Decelerator Systems Technology Conference, 1991

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Additional results on sub–optimal feedback control of non–linear systems†

International Journal of Control, 1969

... GARRARD, W. L., MCCL ~ OOH , NH, and CLARK, LG, 1967, Int. J. Control, 5,425. liA~nm~, R. E.,... more ... GARRARD, W. L., MCCL ~ OOH , NH, and CLARK, LG, 1967, Int. J. Control, 5,425. liA~nm~, R. E., 1960, Boln Soc. mat. mex., 5, 102. LEE, EB, and MARKUS, L., 1967, Foundations of Optintul Control Theory (John Wiley). LURES, D., 1967, Ph.D. Thesis, University of Minnesota. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dynamics and control of tailless aircraft

22nd Atmospheric Flight Mechanics Conference, 1997

Recently there has been considerable interest in the development of aircraft which have reduced v... more Recently there has been considerable interest in the development of aircraft which have reduced vertical tail size compared with conventional aircraft. The tail of an aircraft produces a large radar signature and the requirement for stealth in new military aircraft necessitates the design of ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Piecewise-constant guidance for aeroassisted maneuvers

Aiaa Atmospheric Flight Mechanics Conference, 1992

This paper proposes the use of piecewise constant control in aeroassisted orbital transfers. Aero... more This paper proposes the use of piecewise constant control in aeroassisted orbital transfers. Aeroassisted orbital transfers can be achieved in practice through direct lift modulation or bank angle modulation. Practical implementation prefers constant lift coefficients. On the other hand, controls need to vary in order to cope with uncertainties in the atmosphere. As a result, piecewise constant lift or bank modulation presents a practically useful form. In this paper, several related problems in using piecewise constant lift control are discussed. In particular, the energy is used as the independent variable, and maps of state variables achievable with constant lift controls are provided.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of Eigenspace Techniques to Design of Aircraft Control Systems

1985 American Control Conference, Jun 19, 1985

Eigenspace techniques allow the control system designer to use feedback to place eigenvalues and ... more Eigenspace techniques allow the control system designer to use feedback to place eigenvalues and shape eigenvectors so as to modify closed loop dynamic response characteristics to achieve performance objectives. In this paper the theory of eigenspace design is reviewed, extended and applied to several aircraft control problems.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Eigenspace techniques for active flutter suppression

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application to Parameter Dependent Robust Control Synthesis to Turbofan Engines

Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) syste... more Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) systems are applied to the control of a turbofan engine over a wide range of power codes. Seven linear, time-invariant models are used in the control design. The resulting LPV ...

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Research paper thumbnail of Application of parameter-dependent robust control synthesis to turbofan engines

36th AIAA Aerospace Sciences Meeting and Exhibit, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design of a robust dynamic inversion lateral/directional flight controller

Guidance, Navigation, and Control Conference, 1995

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A new technique for design of controllers for turbofan engines

34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 1998

Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) syste... more Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) systems are applied to the control of a turbofan engine over its entire range of operation. Ten linear, time-invariant models are used in the control design. An LPV model of the turbofan ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design of a Helicopter Control System to Meet Handling Quality Specifications Using H∞ Techniques

Proceedings. The First IEEE Regional Conference on Aerospace Control Systems,, 1993

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design of a helicopter control system to meet handling quality specifications using H(infinity) techniques

Guidance, Navigation and Control Conference, 1993

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Implicit and explicit model-following helicopter flight controllers

Guidance, Navigation, and Control Conference, 1994

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On linear modelling of non-linear systems†

International Journal of Control - INT J CONTR, 1972

In many cases of interest, systems described by non-linear differential equations are modelled by... more In many cases of interest, systems described by non-linear differential equations are modelled by linear equations for purposes of synthesizing feedback controllers. A theorem relating the stability properties of the linear model and the non-linear system is presented and discussed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design of a Multivariable Helicopter Flight Control System for Handling Qualities Enhancement

Journal of the American Helicopter Society, 1990

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application to Parameter Dependent Robust Control Synthesis to Turbofan Engines

Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) syste... more Recent results in multivariable robust control synthesis for linear parameter-varying (LPV) systems are applied to the control of a turbofan engine over a wide range of power codes. Seven linear, time-invariant models are used in the control design. The resulting LPV ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Application of Parameter-Dependent Robust Control Synthesis to Turbofan Engines

Journal of Guidance, Control, and Dynamics, 1999

Bookmarks Related papers MentionsView impact