Ram Iyer - Academia.edu (original) (raw)

Papers by Ram Iyer

Research paper thumbnail of On the identification of Preisach measures

SPIE Proceedings, 2003

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Research paper thumbnail of Smoothing Splines on Unit Ball Domains with Application to Corneal Topography

IEEE Transactions on Medical Imaging, 2017

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Research paper thumbnail of On the solution of operator equation problems with application to Preisach density estimation

2016 American Control Conference (ACC), 2016

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Research paper thumbnail of Variable Step-Size Selection Methods for Implicit Integration Schemes for Odes

Abstract. Implicit integration schemes for ODEs, such as Runge-Kutta and Runge-Kutta-Nyström met... more Abstract. Implicit integration schemes for ODEs, such as Runge-Kutta and Runge-Kutta-Nyström methods, are widely used in mathematics and engi-neering to numerically solve ordinary differential equations. Every integration method requires one to choose a step-size, h, for the integration. If h is too large or too small the efficiency of an implicit scheme is relatively low. As every implicit integration scheme has a global error inherent to the scheme, we choose the total number of computations in order to achieve a prescribed global error as a measure of efficiency of the integration scheme. In this paper, we propose the idea of choosing h by minimizing an efficiency function for general Runge-Kutta and Runge-Kutta-Nyström integration routines. This efficiency function is the critical component in making these methods variable step-size methods. We also investigate solving the intermediate stage values of these routines using both Newton’s method and Picard iteration. We then show...

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Research paper thumbnail of On the computation of the ego-motion and distance to obstacles for a micro air vehicle

2006 American Control Conference, 2006

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Research paper thumbnail of On a two-point boundary value problem for the 2-D Navier-Stokes equations arising from capillary effect

Mathematical Modelling of Natural Phenomena, 2020

In this article, we consider the motion of a liquid surface between two parallel surfaces. Both s... more In this article, we consider the motion of a liquid surface between two parallel surfaces. Both surfaces are non-ideal, and hence, subject to contact angle hysteresis effect. Due to this effect, the angle of contact between a capillary surface and a solid surface takes values in a closed interval. Furthermore, the evolution of the contact angle as a function of the contact area exhibits hysteresis. We study the two-point boundary value problem in time whereby a liquid surface with one contact angle at t = 0 is deformed to another with a different contact angle at t = ∞ while the volume remains constant, with the goal of determining the energy loss due to viscosity. The fluid flow is modeled by the Navier-Stokes equations, while the Young-Laplace equation models the initial and final capillary surfaces. It is well-known even for ordinary differential equations that two-point boundary value problems may not have solutions. We show existence of classical solutions that are non-unique, ...

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Research paper thumbnail of Model of a multiple-lens, single-fiber system in a compound eye

International Journal of Applied Electromagnetics and Mechanics, 2008

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Research paper thumbnail of Characterization of an ETREMA MP 50/6 Magnetostrictive Actuator

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Research paper thumbnail of Stabilization of a system with saturating, non-monotone hysteresis and frequency dependent power losses by a PD controller

Journal of Physics: Conference Series, 2015

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Research paper thumbnail of Investigation of energy dissipation due to contact angle hysteresis in capillary effect

Journal of Physics: Conference Series, 2016

ABSTRACT

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Research paper thumbnail of Novel algorithm for the inversion of the Preisach operator

SPIE Proceedings, 2000

ABSTRACT

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Research paper thumbnail of A modified simple shooting method for solving two-point boundary-value problems

2003 IEEE Aerospace Conference Proceedings (Cat. No.03TH8652)

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Research paper thumbnail of Control of Hysleretic Systems Through Inverse Compensation

Ieee Control Systems, 2009

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Research paper thumbnail of A new method for the computation of motion from image sequences

Proceedings of the 2005, American Control Conference, 2005.

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Research paper thumbnail of vision-based UAV flight control

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Research paper thumbnail of Qualitative analysis of a bulk ferromagnetic hysteresis model

Proceedings of the 37th IEEE Conference on Decision and Control (Cat. No.98CH36171)

Abstract We present a set of equations for a bulk ferromagnetic hysteresis model. We establish th... more Abstract We present a set of equations for a bulk ferromagnetic hysteresis model. We establish the connection between this set of equations and classical energy loss expressions for ferromagnetic hysteresis. We show analytically that for periodic inputs the ...

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Research paper thumbnail of TAC - 2006, Iyer, Toda, and Holsapple

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Research paper thumbnail of An interpolation method for rigid contact lenses

ABSTRACT

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Research paper thumbnail of JoP2010 micromagnetics with eddy currents

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Research paper thumbnail of TAC-2006 Iyer, Meixner and Buckalew

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Research paper thumbnail of On the identification of Preisach measures

SPIE Proceedings, 2003

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Research paper thumbnail of Smoothing Splines on Unit Ball Domains with Application to Corneal Topography

IEEE Transactions on Medical Imaging, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On the solution of operator equation problems with application to Preisach density estimation

2016 American Control Conference (ACC), 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Variable Step-Size Selection Methods for Implicit Integration Schemes for Odes

Abstract. Implicit integration schemes for ODEs, such as Runge-Kutta and Runge-Kutta-Nyström met... more Abstract. Implicit integration schemes for ODEs, such as Runge-Kutta and Runge-Kutta-Nyström methods, are widely used in mathematics and engi-neering to numerically solve ordinary differential equations. Every integration method requires one to choose a step-size, h, for the integration. If h is too large or too small the efficiency of an implicit scheme is relatively low. As every implicit integration scheme has a global error inherent to the scheme, we choose the total number of computations in order to achieve a prescribed global error as a measure of efficiency of the integration scheme. In this paper, we propose the idea of choosing h by minimizing an efficiency function for general Runge-Kutta and Runge-Kutta-Nyström integration routines. This efficiency function is the critical component in making these methods variable step-size methods. We also investigate solving the intermediate stage values of these routines using both Newton’s method and Picard iteration. We then show...

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Research paper thumbnail of On the computation of the ego-motion and distance to obstacles for a micro air vehicle

2006 American Control Conference, 2006

Bookmarks Related papers MentionsView impact

Research paper thumbnail of On a two-point boundary value problem for the 2-D Navier-Stokes equations arising from capillary effect

Mathematical Modelling of Natural Phenomena, 2020

In this article, we consider the motion of a liquid surface between two parallel surfaces. Both s... more In this article, we consider the motion of a liquid surface between two parallel surfaces. Both surfaces are non-ideal, and hence, subject to contact angle hysteresis effect. Due to this effect, the angle of contact between a capillary surface and a solid surface takes values in a closed interval. Furthermore, the evolution of the contact angle as a function of the contact area exhibits hysteresis. We study the two-point boundary value problem in time whereby a liquid surface with one contact angle at t = 0 is deformed to another with a different contact angle at t = ∞ while the volume remains constant, with the goal of determining the energy loss due to viscosity. The fluid flow is modeled by the Navier-Stokes equations, while the Young-Laplace equation models the initial and final capillary surfaces. It is well-known even for ordinary differential equations that two-point boundary value problems may not have solutions. We show existence of classical solutions that are non-unique, ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Model of a multiple-lens, single-fiber system in a compound eye

International Journal of Applied Electromagnetics and Mechanics, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Characterization of an ETREMA MP 50/6 Magnetostrictive Actuator

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stabilization of a system with saturating, non-monotone hysteresis and frequency dependent power losses by a PD controller

Journal of Physics: Conference Series, 2015

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Investigation of energy dissipation due to contact angle hysteresis in capillary effect

Journal of Physics: Conference Series, 2016

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Novel algorithm for the inversion of the Preisach operator

SPIE Proceedings, 2000

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A modified simple shooting method for solving two-point boundary-value problems

2003 IEEE Aerospace Conference Proceedings (Cat. No.03TH8652)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Control of Hysleretic Systems Through Inverse Compensation

Ieee Control Systems, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A new method for the computation of motion from image sequences

Proceedings of the 2005, American Control Conference, 2005.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of vision-based UAV flight control

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Qualitative analysis of a bulk ferromagnetic hysteresis model

Proceedings of the 37th IEEE Conference on Decision and Control (Cat. No.98CH36171)

Abstract We present a set of equations for a bulk ferromagnetic hysteresis model. We establish th... more Abstract We present a set of equations for a bulk ferromagnetic hysteresis model. We establish the connection between this set of equations and classical energy loss expressions for ferromagnetic hysteresis. We show analytically that for periodic inputs the ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of TAC - 2006, Iyer, Toda, and Holsapple

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An interpolation method for rigid contact lenses

ABSTRACT

Bookmarks Related papers MentionsView impact

Research paper thumbnail of JoP2010 micromagnetics with eddy currents

Bookmarks Related papers MentionsView impact

Research paper thumbnail of TAC-2006 Iyer, Meixner and Buckalew

Bookmarks Related papers MentionsView impact