Prof. Stephen E. Bechtel Profile

Prof. Stephen E. Bechtel

at Ohio State Univ

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Author

Publications (5)

Proceedings Article | 28 April 2011 Paper

A two-dimensional theory of coupled electro-magneto-mechanical plates as an application to load-bearing antenna structures

S. Santapuri, S. Bechtel

Proceedings Volume 7978, 79781J (2011) https://doi.org/10.1117/12.889221

KEYWORDS: Antennas, Mathematical modeling, 3D modeling, Electromagnetism, Magnetism, Analytical research, Maxwell's equations, Systems modeling, Actuators, Multifunctional materials

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Multifunctional materials and structures possess the ability to perform multiple tasks by combining structural integrity with sensing and actuating capabilities. Recent progress in the development of such materials/structures has made concepts like load-bearing antennas or load-bearing batteries feasible and formed new research possibilities. Load-bearing antenna structures are multifunctional sensing and actuating devices integrated with a load-bearing structure, i.e. they can simultaneously function as a mechanical structure and an electromagnetic antenna. Such an antenna structure is subjected to mechanical forces, temperature gradients, and electromagnetic fields, giving rise to highly-coupled nonlinear thermo-electro-magneto-mechanical (TEMM) behavior. The current research focuses on modeling and characterizing the nonlinear 3-D coupled behavior of TEMM materials, consistent with first principles. This theoretical framework is specifically aimed at modeling and analysis of load-bearing antenna structures. In this paper we demonstrate the development of analytical techniques and computational tools for multiscale, multi-physics modeling of load-bearing antenna structures. The mathematical model, based predominantly on first principles, employs the thermomechanical governing equations coupled with Maxwell's equations. Our modeling has identified 92 nondimensional numbers which quantify the competition between physical effects in the operation of load-bearing antenna. A fixed relative ordering of all competing effects determines a regime of antenna/environment interaction. In this work, we demonstrate a comprehensive framework to derive the 3-D governing equations for a given regime. For thin geometries, these equations are further reduced to 2-D model, using series expansion and perturbation techniques. Mathematical modeling of thin electro-magneto-mechanical plates can have applications like design and optimization of load-bearing antennas structures. This framework can be extended to model various regimes of behavior of any device/material with coupled electro-magentomechanical capabilites.

Proceedings Article | 1 April 2009 Paper

Predicting magnetorheological fluid flow behavior using a multiscale kinetic theory-based model

Monon Mahboob, Farzad Ahmadkhanlou, Christopher Kagarise, Gregory Washington, Stephen Bechtel, Kurt Koelling

Proceedings Volume 7289, 72891W (2009) https://doi.org/10.1117/12.816133

KEYWORDS: Particles, Magnetism, Microfluidics, Fluid dynamics, 3D modeling, Data modeling, Iron, Motion models, Instrument modeling, Spherical lenses

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Proceedings Article | 3 April 2008 Paper

The development of a five DOF magnetorheological fluid-based telerobotic haptic system

Farzad Ahmadkhanlou, Gregory Washington, Stephen Bechtel

Proceedings Volume 6926, 692604 (2008) https://doi.org/10.1117/12.776591

KEYWORDS: Microfluidics, Particles, Haptic technology, Control systems, Fluid dynamics, Magnetism, Iron, Sensors, Feedback control, Systems modeling

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Proceedings Article | 30 March 2006 Paper

Magnetorheological fluid based automotive steer-by-wire systems

Farzad Ahmadkhanlou, Gregory Washington, Stephen Bechtel, Yingru Wang

Proceedings Volume 6171, 61710I (2006) https://doi.org/10.1117/12.658688

KEYWORDS: Particles, Control systems, Magnetism, Systems modeling, Microfluidics, Sensors, Iron, Resistance, Amplifiers, Haptic technology

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Proceedings Article | 19 May 2005 Paper

The development of variably compliant haptic systems using magnetorheological fluids

Farzad Ahmadkhanlou, Gregory Washington, Yingru Wang, Stephen Bechtel

Proceedings Volume 5757, (2005) https://doi.org/10.1117/12.600255

KEYWORDS: Particles, Systems modeling, Magnetism, Microfluidics, Haptic technology, 3D modeling, Control systems, Iron, Computer programming, Resistance

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