Norman M. Wereley

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We have investigated the ability of humans to stabilize their heads in space and assessed the influence of mental set and the relative importance of visual and vestibular cues. Ten normal subjects and 3 patients with bilateral vestibular loss were studied. Subjects were fixed firmly to the chair of a turntable facing a screen on which was projected a target(More)
The hysteresis behavior of a linear stroke magne-torheological damper is characterized for sinusoidal displacement excitation at 2.0 Hz (nominal). First, we characterize the linearized MR damper behavior using equivalent viscous damping and complex stiffness. Four different nonlinear modeling perspectives are then discussed for purposes of system(More)
This paper presents the stability analysis of the leading edge spar of a flapping wing unmanned air vehicle with a compliant spine inserted in it. The compliant spine is a mechanism that was designed to be flexible during the upstroke and stiff during the downstroke. Inserting a variable stiffness mechanism into the leading edge spar affects its structural(More)
Magnetorheological fluids consist of micron sized iron particles mixed in a carrier fluid, and are commonly used in adaptive dampers. Current simulations of MR fluids have been limited to thousands of particle and have been unable to simulate a a practical fluid volume (∼ mm 3) with a high solids loading (∼ 25 vol %). In this paper, we use NVIDIA's CUDA(More)
Structural Health Monitoring (SHM) of aerospace structures has received significant interest as a core component of Condition Based Maintenance (CBM). An Acousto-Ultrasonic method based on high frequency structural vibrations using piezoelectric transducers has been developed to perform damage detection on metallic and composite aerospace structures. Tests(More)
The objective of this study is to characterize and quantify the performance of Pneumatic Artificial Muscle (PAM) actuators in trailing edge flap activation on a rotor under simulated full scale aerodynamic loads. These actuators provide weight and performance advantages over hydraulics, smart material actuators, and piezoelectric devices. Primary rotor(More)