Dr. Harley H. Cudney Profile

Dr. Harley H. Cudney

Research Mechanical Engineer at US Army Engineer Research and Development Ctr

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Publications (11)

Proceedings Article | 1 May 2008 Paper

Implementing statistical acoustic characterization of urban terrain into a decision support tool

Harley Cudney, D. Keith Wilson, Stephen Ketcham

Proceedings Volume 6963, 69630I (2008) https://doi.org/10.1117/12.777182

KEYWORDS: Acoustics, Wave propagation, 3D modeling, Signal attenuation, Finite-difference time-domain method, Environmental sensing, Signal to noise ratio, Receivers, Reflectivity, Distance measurement

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Proceedings Article | 23 April 2008 Paper

Signal fading curves from computed urban acoustic wave fields

Stephen Ketcham, D. Keith Wilson, Michael Parker, Harley Cudney

Proceedings Volume 6963, 69630K (2008) https://doi.org/10.1117/12.777166

KEYWORDS: Scattering, Acoustics, Wave propagation, Statistical analysis, Sensors, Signal processing, Non-line-of-sight propagation, Signal detection, 3D modeling, Buildings

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Proceedings Article | 16 August 2001 Paper

Modeling and testing of a piezohydraulic actuation system

Khalil Nasser, Nikola Vujic, Donald Leo, Harley Cudney

Proceedings Volume 4327, (2001) https://doi.org/10.1117/12.436547

KEYWORDS: Motion models, Actuators, Smart materials, Smart structures, System integration, Systems modeling

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Proceedings Article | 12 June 2000 Paper

Feasibility of using piezoelectric actuators to control launch vehicle acoustics and structural vibrations

Christopher Niezrecki, Harley Cudney

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388156

KEYWORDS: Acoustics, Actuators, Ferroelectric materials, Scanning probe lithography, Composites, Amplifiers, Silver, Information operations, Silicon, Vibration control

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Future launch vehicle payload fairings will be manufactured form advanced lightweight composite materials. The loss of distributed mass causes a significant increase in the internal acoustic environment, causing a severe threat to the payload. Using piezoelectric actuators to control the fairing vibration and the internal acoustic environment has been proposed. To help determine the acoustic control authority of piezoelectric actuators mounted on a rocket fairing, the internal acoustic response created by the actuators needs to be determined. In this work, the internal acoustic response of a closed simply-supported (SS) cylinder actuated by piezoelectric (PZT) actuators is determined using a n impedance model for the actuator and boundary element analysis. The experimentally validated model is used to extrapolate results for a SS cylinder that emulates a Minotaur payload fairing. The internal cylinder acoustic levels are investigated for PZT actuation between 35 and 400 Hz. Significant reductions in the structural response due to increased damping do not equate to similar reductions in the acoustic SPLs for the cylinder. The sound levels at the acoustic resonant frequencies are essentially unaffected by the significant increase in structural damping while the acoustic level sat the structural resonant frequencies are mildly reduced. The interior acoustic response of the cylinder is dominated by the acoustic modes and therefore significant reductions in the overall interior acoustic levels will not be achieved if only the structural resonances are controlled. As the actuation frequency is reduced, the number of actuators required to generate acoustic levels commensurate to that found in the fairing increases to impractical values. Below approximately 100 Hz, the current demands reach levels that are extremely difficult to achieve with a practical system. The results of this work imply that PZT actuators do not have the authority to control the payload fairing internal acoustics below approximately 100 Hz.

Proceedings Article | 12 June 2000 Paper

Compact piezohydraulic actuation system

Khalil Nasser, Donald Leo, Harley Cudney

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388174

KEYWORDS: Actuators, Electronics, Amplifiers, Microfluidics, Control systems, Signal processing, Mechanical engineering, Electrical efficiency, Systems modeling, Transducers

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Proceedings Article | 31 May 1999 Paper

Impedance-based health monitoring technique for massive structures and high-temperature structures

Gyuhae Park, Harley Cudney, Daniel Inman

Proceedings Volume 3670, (1999) https://doi.org/10.1117/12.349760

KEYWORDS: Ferroelectric materials, Sensors, Structural health monitoring, Temperature metrology, Intelligence systems, Nondestructive evaluation, Composites, Smart materials, Sun, Damage detection

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Proceedings Article | 21 July 1998 Paper

Removing effects of temperature changes from piezoelectric impedance-based qualitative health monitoring

Gyuhae Park, Kazuhisa Kabeya, Harley Cudney, Daniel Inman

Proceedings Volume 3330, (1998) https://doi.org/10.1117/12.316963

KEYWORDS: Temperature metrology, Ferroelectric materials, Nondestructive evaluation, Sensors, Intelligence systems, Dielectrics, Algorithm development, Structural dynamics, Damage detection, Actuators

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Proceedings Article | 6 June 1997 Paper

Adaptive, split-flap actuator for retreating blade stall control

Razvan Rusovici, Harley Cudney

Proceedings Volume 3041, (1997) https://doi.org/10.1117/12.275644

KEYWORDS: Actuators, Amplifiers, Aerodynamics, Control systems, Head, Smart materials, Intelligence systems, Manufacturing, Nose, Chlorine

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Proceedings Article | 23 May 1997 Paper

Full-scale ferromagnetic active tagging testing of C-channel composite elements

Zao Chen, Harley Cudney, Victor Giurgiutiu, Craig Rogers, Robert Quattrone, Justin Berman

Proceedings Volume 3043, (1997) https://doi.org/10.1117/12.274640

KEYWORDS: Composites, Inspection, Neurons, Magnetism, Nondestructive evaluation, Electromagnetism, Neural networks, Particles, Signal processing, Ferromagnetics

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This paper presents the work we have done on a health monitoring technique called active non-destructive evaluation (ANDE) for detecting delaminations in full-scale C-channel structural elements of glass-fiber reinforced polymer (GFRP) composites using active ferromagnetic tagging. Conventional non-destructive evaluation methods are not very effective in monitoring the material conditions of GFRP composite and adhesive joints. A technology that has been proposed to enhance inspection of such non-conductive and non-magnetic GFRP composites is the particle tagging technique. This technique, previously demonstrated on small scale laboratory samples is being developed for full-scale C-channel composite elements. This technique relies on comparing changes in local-area mechanical properties of the structure to identify delaminations. Unlike conventional passive tagging NDE inspection, our technique uses an electromagnetic exciter to interrogate tagged composites over a broad frequency range. As the vibration excitation approaches the resonant frequency of the area of the disbondment, the response amplitude obtained for a given force input increases. Therefore, at frequencies around the transverse resonance of the layer above a defect, the response for a given force will be greater than the response in flawless regions of the structure. Thus, the ANDE test may be based on response measurements alone. The technique is most sensitive if excitation is applied at the plate resonant frequency. Since this frequency is dependent on defect size and depth, a broad band of frequencies must be covered. A laser Doppler vibrometer is a high-sensitivity, high-speed and non-contacting instrument used for detecting surface vibrations. The frequency response curves are obtained using a fast Fourier transform signal processor. An algorithm based on training a neural network to detect significant differences between healthy and damaged structures is then applied to recognize delaminations in full scale structural elements. This method provides the fundamental technology needed for developing a commercial system to monitor the integrity of composite structures, both during manufacturing and during their lifetime as structural elements.

Proceedings Article | 1 May 1994 Paper

Modeling the dynamics of removable and reusable piezoelectric patch-type actuators

Thomas McCray, Harley Cudney

Proceedings Volume 2192, (1994) https://doi.org/10.1117/12.174217

KEYWORDS: Actuators, Cements, Electromagnetism, Aluminum, Statistical analysis, Optical testing, Systems modeling, Composites, Data acquisition, Amplifiers

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Proceedings Article | 23 July 1993 Paper

Modeling multiple-layer piezoelectric actuators in active structural control

John Richard, Harley Cudney

Proceedings Volume 1916, (1993) https://doi.org/10.1117/12.148478

KEYWORDS: Actuators, Multilayers, Motion models, Information operations, Ferroelectric materials, Error analysis, Vibration control, Systems modeling, Lanthanum, Partial differential equations

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Showing 5 of 11 publications

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