Dr. Keith K. Denoyer Profile

Dr. Keith K. Denoyer

Manager/New Mexico Operations

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 14 August 2003 Paper

Paper

Actively controlled thin-shell space optics

Keith Denoyer, Eric Flint, John Main, Jason Lindler

Proceedings Volume 5054, (2003) https://doi.org/10.1117/12.483884

KEYWORDS: Mirrors, Wavefronts, Control systems, Structural dynamics, Thin films, Reflectors, Astronomical imaging, Actuators, Manufacturing, Finite element methods

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Proceedings Article | 31 July 2003 Paper

Paper

Experimental validation of a novel stictionless magnetorheological fluid isolator

Shawn Kelso, Keith Denoyer, Ross Blankinship, Kenneth Potter, Jason Lindler

Proceedings Volume 5052, (2003) https://doi.org/10.1117/12.483966

KEYWORDS: Optical isolators, Fluid dynamics, Data modeling, Prototyping, Motion models, Instrument modeling, Actuators, Sensors, Motion measurement, Kinematics

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Proceedings Article | 14 June 2001 Paper

Paper

Recent transitions of smart structures technologies through flight experiments

Benjamin Henderson, Keith Denoyer

Proceedings Volume 4332, (2001) https://doi.org/10.1117/12.429652

KEYWORDS: Smart structures, Space operations, Vibration isolation, Adaptive control, Control systems, Actuators, Analytical research, Satellites, Space telescopes, Sensors

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Proceedings Article | 12 June 2000 Paper

Paper

Middeck Active Control Experiment Reflight (MACE II): lessons learned and reflight status

Ronald Ninneman, Keith Denoyer

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388154

KEYWORDS: Detection and tracking algorithms, Control systems, Adaptive control, Space operations, Sensors, Systems modeling, Actuators, Active optics, Analytical research, Control systems design

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Proceedings Article | 12 June 2000 Paper

Paper

Experiences with smart structures for on-orbit vibration isolation

Leslie Sullivan, R. Scott Erwin, Keith Denoyer

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388153

KEYWORDS: Satellites, Vibration isolation, Control systems, Digital signal processing, Passive isolation, Active isolation, Actuators, Electronics, Smart structures, Space operations

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Proceedings Article | 12 June 2000 Paper

Paper

Lessons learned from 20th century AFRL smart structures space experiments

Keith Denoyer

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388151

KEYWORDS: Control systems, Space operations, Actuators, Sensors, Smart structures, Detection and tracking algorithms, Satellites, Electronics, Systems modeling, Performance modeling

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Proceedings Article | 12 June 2000 Paper

Paper

On-orbit experiments and applications of shape memory alloy mechanisms

Andrew Peffer, Eugene Fosness, Bernie Carpenter, Keith Denoyer

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388160

KEYWORDS: Shape memory alloys, Space operations, Satellites, Contamination, Actuators, Analytical research, Astronomical engineering, Safety, Manufacturing, Electronics

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Proceedings Article | 12 June 2000 Paper

Paper

1000 days on orbit: lessons learned from the ACTEX-I flight experiment

R. Scott Erwin, Keith Denoyer

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388152

KEYWORDS: Control systems, Smart structures, Analog electronics, Sensors, Electronics, Analytical research, Actuators, Satellites, Defense and security, Defense technologies

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Proceedings Article | 9 June 1999 Paper

Paper

Control of the ultraLITE precision deployable test article using adaptive spatio-temporal-filtering-based control

Albert Bosse, Thomas Sharp, Stuart Shelley, Keith Denoyer, R. Scott Erwin

Proceedings Volume 3668, (1999) https://doi.org/10.1117/12.350724

KEYWORDS: Sensors, Control systems, Interferometers, Actuators, Space telescopes, Error analysis, Digital filtering, Active optics, Digital signal processing, Active vibration control

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Proceedings Article | 9 June 1999 Paper

Paper

Tuning of active vibration controllers for ACTEX by genetic algorithm

Moon Kwak, Keith Denoyer

Proceedings Volume 3668, (1999) https://doi.org/10.1117/12.350722

KEYWORDS: Genetic algorithms, Amplifiers, Sensors, Actuators, Control systems, Active vibration control, Analog electronics, Smart structures, Feedback control, System identification

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Proceedings Article | 8 December 1998 Paper

Paper

Model inversion tracking control for UltraLITE using neural networks

Jesse Leitner, Keith Denoyer

Proceedings Volume 3430, (1998) https://doi.org/10.1117/12.332478

KEYWORDS: Neural networks, Control systems, Actuators, Analytical research, Space operations, Complex systems, Numerical simulations, Systems modeling, Sensors, Mirrors

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Proceedings Article | 8 December 1998 Paper

Paper

Robust line-of-sight stability and jitter compensation using spatiotemporal-filtering-based control approaches

Stuart Shelley, Thomas Sharp, Keith Denoyer

Proceedings Volume 3430, (1998) https://doi.org/10.1117/12.332479

KEYWORDS: Sensors, Actuators, Control systems, Systems modeling, Mirrors, Space telescopes, Filtering (signal processing), Interferometers, Active vibration control, Device simulation

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Proceedings Article | 8 December 1998 Paper

Paper

Accelerated convergence of neural network system identification algorithms via principal component analysis

David Hyland, Lawrence Davis, Keith Denoyer

Proceedings Volume 3430, (1998) https://doi.org/10.1117/12.332480

KEYWORDS: Principal component analysis, Neural networks, System identification, Algorithm development, Evolutionary algorithms, Neurons, Control systems, Actuators, Complex systems, Statistical modeling

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Proceedings Article | 8 December 1998 Paper

Paper

Online method of identifying MIMO plants employing the minimum number of parameters

Lawrence Davis, Keith Denoyer

Proceedings Volume 3430, (1998) https://doi.org/10.1117/12.332481

KEYWORDS: Sensors, Matrices, System identification, Device simulation, Systems modeling, Adaptive control, Control systems, Computer simulations, Imaging systems, Principal component analysis

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Proceedings Article | 27 July 1998 Paper

Paper

Experimental sensor and actuator location procedure for control of dynamically complex smart structures

Steven Griffin, Keith Denoyer

Proceedings Volume 3329, (1998) https://doi.org/10.1117/12.316936

KEYWORDS: Sensors, Actuators, Ferroelectric polymers, Motion models, Smart sensors, Acoustics, Modal analysis, Smart structures, Motion measurement, Error analysis

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Proceedings Article | 27 July 1998 Paper

Paper

Hybrid structural/acoustic control of a subscale payload fairing

Keith Denoyer, Steven Griffin, Dino Sciulli

Proceedings Volume 3329, (1998) https://doi.org/10.1117/12.316896

KEYWORDS: Acoustics, Composites, Actuators, Sensors, Bandpass filters, Aerospace engineering, Space operations, Feedback control, Analytical research, Feedback loops

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During launch, spacecraft experience severe acoustic and vibration loads. Acoustic loads are primarily transmitted through the shroud or payload fairing of the launch vehicle. In recent years, there has been a trend towards using lighter weight and extremely stiff structures such as sandwich construction and grid-stiffened composites in the manufacturing of payload fairings. While substantial weight savings can be achieved using these materials, the problem of acoustic transmission is exacerbated. For this reason, the Air Force Research Laboratory has been actively engaged in vibroacoustic research aimed at reducing the acoustic and vibration levels seen by payloads during launch. This paper presents experimental results for the simultaneous structural and acoustic cavity mode control of a sub-scale composite isogrid payload fairing structure. In this experiment, actuation is performed through the use of both an internal speaker as well as piezoceramic strain actuators located on the outer skin of the composite structure. Sensing is accomplished using a microphone as well as a piezoelectric strain sensor. The control approach presented in this paper is a decentralized frequency domain approach which makes use of a series of independent control loops. One loop uses the microphone and speaker, while additional loops use the piezoelectric sensors and actuators. The control algorithm consists of independent second-order Positive Position Feedback (PPF) controllers tuned to reduce the magnitude of each cavity mode. A PPF filter in conjunction with an extremely sharp bandpass filter is used on the structural mode of limit spillover. This approach leads to a substantial reduction in the acoustic transmission in the range of 0 - 800 Hz. Transmission coincident with the primary cavity modes of the system are reduced in magnitude by 26 and 9 dB respectively while the structural model that is responsible for the majority of transmission is reduced by approximately 7 dB.

Proceedings Article | 1 May 1996 Paper

Paper

Damage detection via parameter correction using measured static flexibility matrices

Keith Denoyer, Lee Peterson

Proceedings Volume 2717, (1996) https://doi.org/10.1117/12.239024

KEYWORDS: Matrices, Finite element methods, Damage detection, Numerical simulations, Chemical elements, Data modeling, Detection and tracking algorithms, Smart structures, Error analysis, Computer simulations

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Proceedings Article | 8 September 1993 Paper

Paper

Dynamic modeling and vibration suppression of a slewing active structure utilizing piezoelectric sensors and actuators

Keith Denoyer, Moon Kwak

Proceedings Volume 1917, (1993) https://doi.org/10.1117/12.152818

KEYWORDS: Control systems, Sensors, Actuators, Intelligence systems, Smart structures, Modeling, Amplifiers, Data modeling, Analog electronics, Systems modeling

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Showing 5 of 18 publications

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