Search Results - "Mrad, R.B."

A systematic procedure for the design of piezoelectric inchworm precision positioners by Tenzer, P.E., Mrad, R.B.

“…Design equations are developed and integrated into a computerized design tool in order to facilitate the creation of inchworm piezoelectric based positioners…”
Get full text

Design considerations for complementary inchworm actuators by Salisbury, S.P., Waechter, D.F., Mrad, R.B., Prasad, S.E., Blacow, R.G., Yan, B.

“…An inchworm actuator is described, which uses complementary configurations for the two clamping sections. In one configuration, clamping and release are…”
Get full text

Closed-Loop Control of a Complementary Clamp Piezoworm Actuator by Salisbury, S.P., Waechter, D.F., Mrad, R.B., Prasad, S.E., Blacow, R.G., Bin Yan

“…The concept of the complementary clamp piezoworm actuator with a diode-shunted delay circuit was experimentally verified through prototype testing. One clamp…”
Get full text

Large-stroke microelectrostatic actuators for vertical translation of micromirrors used in adaptive optics by Siyuan He, Mrad, R.B.

“…Two microelectrostatic actuators able to produce a repulsive force in the out-of-plane direction are presented in this paper. The electrostatic actuators use…”
Get full text

Modeling of Wet Stiction in Microelectromechanical Systems (MEMS) by Hariri, Alireza, Zu, Jean, Ben Mrad, Ridha

“…Stiction, which is a term commonly used in micro-electromechanical systems (MEMS) to refer to adhesion, is a major failure mode in MEMS. Undesirable stiction,…”
Get full text

Time-optimal rendezvous with moving objects in dynamic cluttered environments using a guidance based technique by Kunwar, F., Wong, F., Mrad, R.B., Benhabib, B.

“…This paper presents a novel method for the time-optimal rendezvous of an autonomous vehicle with moving targets in the presence of dynamic obstacles. This…”
Get full text

Dynamic modeling of hysteresis in piezoceramics by Mrad, R.B., Hu, H.

“…A model for hysteresis in piezoceramic actuators when they are subject to dynamic voltage excitations is developed. The model uses measurements of the first…”
Get full text

Rendezvous Guidance for the Autonomous Interception of Moving Objects in Cluttered Environments by Kunwar, F., Wong, F., Mrad, R.B., Benhabib, B.

“…This paper presents a novel method for the time-optimal interception of moving objects in the presence of obstacles. The proposed method not only provides…”
Get full text

Control strategies for an inchworm piezomotor by Mrad, R.B., Abhari, A., Zu, J.

“…This paper describes two control methodologies developed for an inchworm type precision piezomotor. The paper presents a motor designed based on the classical…”
Get full text

Modeling of Surface Forces between Micron-Sized Objects in Dry Condition by Hariri, A., Zu, J.W., Mrad, R.B.

“…Capillary, van der Walls (vdW) and electrostatic forces, which usually termed as surface forces, can significantly affect the behavior and performance of Micro…”
Get full text

A linear estimation algorithm for ARMAX models with time dependent coefficients by Mrad, R.B., Farag, E., Levitt, J.A.

“…An approach that models a nonlinear process based on multi-input/single-output measurements is developed. The approach uses a stochastic time-varying…”
Get full text

Nonlinear process representation using ARMAX models with time dependent coefficients by Mrad, R.B., Levitt, J.A.

“…Motivated by the need to improve the estimation of mass air flow going into an automobile engine, an approach that models a nonlinear process operating over a…”
Get full text