Dr. Adam C. Wroblewski Profile

Dr. Adam C. Wroblewski

Optical Research & Development Engineer

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Author

Publications (8)

SPIE Journal Paper | 30 March 2021

Laser beam propagation simulations of long-path scintillation and fade with comparison to ground-to-aircraft optical link measurements

Yousef Chahine, Adam Wroblewski, John Malowicki, Joseph Flatico, Gunnar Ristroph, Alex Hsia, Rani Megally, Adam Resnick

OE, Vol. 60, Issue 03, 036112, (March 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.3.036112

KEYWORDS: Scintillation, Optical simulations, Atmospheric propagation, Atmospheric optics, Atmospheric modeling, Laser beam propagation, Turbulence, Computer simulations, Wave propagation, Optical engineering

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Proceedings Article | 5 March 2021 Presentation + Paper

An overview of key optical communications technologies under development at the NASA Glenn Research Center

Félix Miranda, Sarah Tedder, Brian Vyhnalek, Jennifer Downey, Adam Wroblewski, Casey Bakula, Evan Katz, John Lekki, Rachel Dudukovich, Alan Hylton, Daniel Raible, Robert Romanofsky

Proceedings Volume 11692, 116920X (2021) https://doi.org/10.1117/12.2579420

KEYWORDS: Aerospace engineering, New and emerging technologies, Space operations, Data communications, Telecommunications, Quantum key distribution, Mobile communications, Video, Space robots, Robotics

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Proceedings Article | 2 March 2020 Paper

Beam propagation through atmospheric turbulence using an altitude-dependent structure profile with non-uniformly distributed phase screens

Yousef Chahine, Sarah Tedder, Brian Vyhnalek, Adam Wroblewski

Proceedings Volume 11272, 1127215 (2020) https://doi.org/10.1117/12.2543583

KEYWORDS: Turbulence, Atmospheric propagation, Scintillation, Atmospheric optics, Wave propagation, Beam propagation method

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Proceedings Article | 1 April 2015 Paper

Using a general purpose finite element approach to attain higher fidelity rotordynamic analyses

Andrew Gyekenyesi, Adam Wroblewski

Proceedings Volume 9437, 943713 (2015) https://doi.org/10.1117/12.2084625

KEYWORDS: Chemical elements, Solid modeling, 3D modeling, Computer aided design, Visualization, Systems modeling, Physics, Solids, Aerospace engineering, Roads

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Proceedings Article | 27 March 2015 Paper

Assessment of NDE methods for detecting cracks and damage in environmental barrier coated CMC tested under tension

Ali Abdul-Aziz, Adam Wroblewski, Ramakrishna Bhatt, Martha Jaskowiak, Daniel Gorican, Richard Rauser

Proceedings Volume 9436, 943609 (2015) https://doi.org/10.1117/12.2087600

KEYWORDS: Digital image correlation, Coating, Composites, Computed tomography, Optical microscopy, Cameras, Photography, Scanning electron microscopy, Nondestructive evaluation, Silicon carbide

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For validating physics based analytical models predicting spallation life of environmental barrier coating (EBC) on fiber reinforced ceramic matrix composites, the fracture strength of EBC and kinetics of crack growth in EBC layers need to be experimentally determined under engine operating conditions. In this study, a multi layered barium strontium aluminum silicate (BSAS) based EBC-coated, melt infiltrated silicon carbide fiber reinforced silicon carbide matrix composite (MI SiC/SiC) specimen was tensile tested at room temperature. Multiple tests were performed on a single specimen with increasing predetermined stress levels until final failure. During loading, the damage occurring in the EBC was monitored by digital image correlation (DIC). After unloading from the predetermined stress levels, the specimen was examined by optical microscopy and computed tomography (CT). Results indicate both optical microscopy and CT could not resolve the primary or secondary cracks developed during tensile loading until failure. On the other hand, DIC did show formation of a primary crack at ~ 50% of the ultimate tensile strength and this crack grew with increasing stress and eventually led to final failure of the specimen. Although some secondary cracks were seen in the DIC strain plots prior to final failure, the existence of these cracks were not confirmed by other methods. By using a higher resolution camera, it is possible to improve the capability of DIC in resolving secondary cracks and damage in coated specimen tested at room temperature, but use of DIC at high temperature requires significant development. Based on the current data, it appears that both optical microscopy and CT do not offer any hope for detecting crack initiation or determining crack growth in EBC coated CMC tested at room or high temperatures after the specimen has been unloaded. Other methods such as, thermography and optical/SEM of the polished cross section of EBC coated CMC specimens stressed to predetermined levels and cycled to certain time at a given stress need to be explored.

Proceedings Article | 10 April 2014 Paper

Utilizing a general purpose finite element approach for assessing the rotordynamic response of a flexible disk/shaft system

Adam Wroblewski, Andrew Gyekenyesi

Proceedings Volume 9063, 906320 (2014) https://doi.org/10.1117/12.2046446

KEYWORDS: Chemical elements, Systems modeling, Visualization, Computer aided design, 3D modeling, Error analysis, Computing systems, Physics, Solid modeling, Solids

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Proceedings Article | 11 April 2013 Paper

Numerical study of structural change estimation in a rotor system based on changes in resonance and antiresonance frequencies

Adam Wroblewski

Proceedings Volume 8694, 86941H (2013) https://doi.org/10.1117/12.2009827

KEYWORDS: Chemical elements, Optimization (mathematics), Data modeling, Finite element methods, Magnetism, Mathematical modeling, Structural health monitoring, Actuators, Genetics, System identification

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Proceedings Article | 18 April 2011 Paper

High-speed AMB machining spindle model updating and model validation

Adam Wroblewski, Jerzy Sawicki, Alexander Pesch

Proceedings Volume 7983, 79830L (2011) https://doi.org/10.1117/12.880778

KEYWORDS: Spindles, Data modeling, Amplifiers, Optimization (mathematics), Sensors, Magnetism, Performance modeling, Device simulation, System identification, Finite element methods

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Showing 5 of 8 publications

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