Now showing items 1-10 of 1161
Dynamics and Control of Underwater Gliders I: Steady Motions
(Virginia Center for Autonomous Systems, 2007)
This paper describes analysis of steady motions for underwater gliders, a type of highly efficient underwater vehicle which uses gravity for propulsion. Underwater gliders are winged underwater vehicles which locomote by ...
Crack Detection and Measurement Utilizing Image-Based Reconstruction
Image-based reconstruction for automated crack detection has been on the rise for the past decade or so; this new technology can be applicable to many different areas such as laboratory testing, field inspections, construction ...
Thermal Response of Integral Abutment Bridges with Mechanically Stabilized Earth Walls
(Virginia Center for Transportation Innovation and Research, 2013-03-01)
The advantages of integral abutment bridges (IABs) include reduced maintenance costs and increased useful life spans. However, improved procedures are necessary to account for the impacts of cyclic thermal displacements ...
System Synthesis Supplementary Data
(Virginia Tech, 2018-02-22)
Dynamics & Control of Underwater Gliders II: Motion Planning and Control
(Virginia Center for Autonomous Systems, 2010)
This paper describes an underwater glider motion control system intended to enhance locomotive efficiency by reducing the energy expended by vehicle guidance and control. In previous work, the authors derived an approximate ...
Vehicle Dynamics in Currents
(Virginia Center for Autonomous Systems, 2011)
Vehicles operating in non-uniform flow fields are subject to forces and moments that are not captured by kinematic motion models. These effects are even greater when the mass of the displaced fluid is commensurate with the ...
Nonlinear Estimation with State-Dependent Gaussian Observation Noise
(Virginia Center for Autonomous Systems, 2008)
We consider the problem of estimating the state of a system when measurement noise is a function of the system's state. We propose generalizations of the iterated extended Kalman filter and of the extended Kalman filter ...
Experimental Evaluation of a Vehicular Access Door Subjected to Hurricane Force Wind Pressures
(Virginia Polytechnic Institute and State University, 2009-11-01)
This report presents findings on the behavior of a typical rolling sheet vehicular access door under a hurricane force wind pressure. The objectives are to quantify the structural behavior of a rolling sheet vehicular ...
Turbulence Measurements in Trailing Vortices for B.W.I. Noise Prediction
(Virginia Polytechnic Institute and State University, 1992-06-01)
Blade wake interaction (BWI) noise is the broadband noise generated by the ingestion of turbulent tip vortices into helicopter rotors. Prediction of BWI noise requires knowledge of the turbulence structure of the tip vortex. ...
Stiffness and Strength of Single Shear Cold-Formed Steel Screw-Fastened Connections
Results are presented from an experimental program on single shear cold-formed steel-to-steel through-fastened screw connections, including documentation of the complete load-deformation response and stiffness degradation. ...