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Guidance And Control Of Unmanned Airships For Waypoint Navigation In The Presence Of Wind
(Aerospace Engineering, 2012-07-25)
Airships are a specific class of Lighter-Than-Air (LTA) vehicles. These vehicles achieve lift mainly through buoyancy; the usually ellipsoidal shaped hull contains a lifting gas such as helium, which produces the required ...
Study Of The Surface Roughness Evolution In Fatigued 316L Stainless Steel
(Mechanical Engineering, 2012-07-25)
Fatigue is a critical design consideration in many aerospace structures. As improvements are sought in overall performance, maintenance requirements, and total service life of modern aircrafts, the demands for fatigue ...
Dynamic Mode Decomposition Of Detonation Waves
(Aerospace Engineering, 2012-07-25)
Dynamic mode decomposition is applied to study the self-excited fluctuations supported by transversely unstable detonations. The focus of this study is on the effect of forcing on the limit cycle solutions. Using DMD, only ...
New Detonation Concepts For Propulsion And Power Generation
(Aerospace Engineering, 2012-07-25)
A series of related analytical and experimental studies are focused on utilizing detonations for emerging propulsion and power generation devices. An understanding of the physical and thermodynamic processes for this ...
Hygrothermally Stable Laminated Composites For Optimal Extension Twist Coupling In Closed Cell Configuration
(Aerospace Engineering, 2012-07-25)
An optimization routine utilizing the sequential quadratic programming method is used to develop laminates that are hygrothermally stable in flat-strip configuration and are optimal for extension twist coupling in closed ...
Static And Dynamic Calibration Of A Multi-component Sidewall Force Balance For A Transonic Ludwieg Tube Wind Tunnel
(Aerospace Engineering, 2012-04-11)
Experimentation involving transonic flow requires replicating not only the Mach number but also the Reynolds number. Improper matching of the Reynolds number affects the interaction between the shocks and boundary layer ...
Using GPU-based Computing To Accelerate Finite Element Problems
(Aerospace Engineering, 2012-07-25)
Historically Graphics Processing Units (GPU) have been used for offloading graphical visualization and made popular in use for video games, but with the development of NVIDIA's CUDA architecture and programing language ...
Control Of Airship Motion In The Presence Of Wind
(Aerospace Engineering, 2012-07-25)
This research effort develops a guidance and control system for a small airship to fly through assigned waypoints in the three dimensional space with a desired speed in the presence of wind and wind gust. In the control ...
Design, Calibration And Testing Of A Force Balance For A Hypersonic Shock Tunnel
(Aerospace Engineering, 2012-07-25)
The forces acting on a flight vehicle are critical for determining its performance. Of particular interest is the hypersonic regime. Force measurements are much more complex in hypersonic flows, where those speeds are ...
New Developments In Cognitive Optimization
(Mechanical Engineering, 2012-07-25)
This work presents an approach to solve function optimization problems using cognitive optimization. A cognitive search algorithm which is developed mimics human cognition in structure and characteristics. This algorithm ...