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- Praveen Vijayraghavan, Prabha Vijayraghavan, R. Vijayraghavan, Romesh Batra
- 2001

We study the influence of von Karman nonlinearity, van der Waals force, and a athermal stresses on pull-in instability and small vibrations of electrostatically actuated mi-croplates. We use the Galerkin method to develop a tractable reduced-order model for elec-trostatically actuated clamped rectangular microplates in the presence of van der Waals… (More)

We analyze electrostatic deformations of rectangular, annular circular, solid circular, and elliptic micro-electromechanical systems (MEMS) by modeling them as elastic membranes. The nonlinear Poisson equation governing their deformations is solved numerically by the meshless local Petrov–Galerkin (MLPG) method. A local symmetric augmented weak formulation… (More)

- R. Gummalla, Romesh C. Batra, Romesh Batra
- 1999

We analyze plane strain thermomechanical deformations of a prenotched rectangular plate impacted on one side by a prismatic body of rectangular cross-section and moving parallel to axis of the notch. Both the plate and the projectile are made of the same material. Strain hardening, strain-rate hardening and thermal softening characteristics of the material… (More)

- Ronald D. Kriz, Diana Farkas, Romesh C. Batra, Arturo Falck
- 1999

We describe the development of modules for teaching a senior level course, Mechanical Behavior of Materials, that incorporate the results of state of the art simulation techniques. The modules are Web-Java based and make extensive use of materials available through the Internet. The most important characteristic of these modules is that they teach the… (More)

A robust nonlinear observer, utilizing the sliding mode concept, is developed for the dynamic positioning of ships. The observer provides the estimates of linear velocities of the ship and bias from the slowly varying environmental loads. It also filters out wave frequency motion to avoid wear of actuators and excessive fuel consumption. Especially, the… (More)

- Deborah F. Pilkey, Romesh Batra
- 1998

The characterization of damping is important in making accurate predictions of both the true response and the frequency response of any device or structure dominated by energy dissipation. The process of modeling damping matrices and experimental verification of those is challenging because damping can not be determined via static tests as can mass and… (More)

- Senthil S. Vel, R. C. Batra, Clifton C. Garvin
- 2003

An analytical solution is presented for three-dimensional thermomechanical deformations of a simply supported functionally graded (FG) rectangular plate subjected to time-dependent thermal loads on its top and/or bottom surfaces. Material properties are taken to be analytical functions of the thickness coordinate. The uncoupled quasi-static linear… (More)

This work describes a complete framework for generation of compact analog circuit macromodels which significantly reduce the model complexity while still capturing the dominant linear and nonlinear response of the circuit. The technique is applicable to a broad class of circuits that exhibit weakly nonlinear behavior such as mixers, RF power amplifiers and… (More)

- R. C. BATRA
- 1998

For simple shearing and simple extension deformations of a homogeneous and isotropic elastic body, it is shown that a linear relation between the second Piola–Kirchhoff stress tensor and the Green–St. Venant strain tensor does not predict a physically reasonable response of the body. This constitutive relation implies that the slope of the curve between an… (More)