William Garrard - Academia.edu (original) (raw)
Papers by William Garrard
Journal of Guidance, Control, and Dynamics, 2009
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Journal of Guidance, Control, and Dynamics, 1997
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Automatica, 1969
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11th Aerodynamic Decelerator Systems Technology Conference, 1991
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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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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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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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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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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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36th AIAA Aerospace Sciences Meeting and Exhibit, 1998
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Guidance, Navigation, and Control Conference, 1995
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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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Proceedings. The First IEEE Regional Conference on Aerospace Control Systems,, 1993
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Guidance, Navigation and Control Conference, 1993
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Guidance, Navigation, and Control Conference, 1994
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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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Journal of the American Helicopter Society, 1990
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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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Journal of Guidance, Control, and Dynamics, 1999
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Journal of Guidance, Control, and Dynamics, 2009
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Journal of Guidance, Control, and Dynamics, 1997
Bookmarks Related papers MentionsView impact
Automatica, 1969
Bookmarks Related papers MentionsView impact
11th Aerodynamic Decelerator Systems Technology Conference, 1991
Bookmarks Related papers MentionsView impact
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
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
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
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
Bookmarks Related papers MentionsView impact
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
36th AIAA Aerospace Sciences Meeting and Exhibit, 1998
Bookmarks Related papers MentionsView impact
Guidance, Navigation, and Control Conference, 1995
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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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Proceedings. The First IEEE Regional Conference on Aerospace Control Systems,, 1993
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Guidance, Navigation and Control Conference, 1993
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Guidance, Navigation, and Control Conference, 1994
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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
Journal of the American Helicopter Society, 1990
Bookmarks Related papers MentionsView impact
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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Journal of Guidance, Control, and Dynamics, 1999
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