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Now showing items 1-10 of 16
Prognostics Health Management and Damage Relationships of Lead-Free Components in Thermal Cycling Harsh Environments
(2008-09-09)
There has been a growing interest in the area of health monitoring of electronics in order to predict the failure and provide warnings. Existing Prognostics Health Management methodologies are very reactive in nature and ...
Relative Positioning of Unmanned Ground Vehicles Using Ultrasonic Sensors
(2008-09-09)
In this thesis, a Global Positioning System/Inertial Navigation System (GPS/INS) is developed and applied to a tracked Unmanned Ground Vehicle (UGV) to provide estimates of position, heading, and velocity. The navigation ...
Parameter Estimation Techniques for Determining Safe Vehicle Speeds in UGVs
(2008-09-09)
This thesis develops simplified equations to predict a velocity in which vehicle rollover or tire saturation occurs. These equations are functions of different vehicle parameters that are important to vehicle handling ...
Adaptive Control of a Farm Tractor with Varying Yaw Properties Accounting for Actuator Dynamics and Nonlinearities
(2008-09-09)
Two adaptive control algorithms for the automatic steering control of a farm tractor with varying hitch forces are developed. Tractors can be configured many different implements, and implements interact with the soil in ...
Finite Element Analysis of Three-Dimensional Elasto-Plastic Sinusoidal Contact and Inclusion in a Multi-Scale Rough Surface Contact Model
(2008-09-09)
Researchers have developed many models to simulate the elasto-plastic contact of spheres. However, there does not appear to exist a closed-form analytical model for elasto-plastic three dimensional sinusoidal contact. This ...
Stream Function Path Planning and Control for Unmanned Ground Vehicles
(2008-09-09)
This research develops a harmonic potential field based path planner and controller. The first component of the dissertation compares several analytical and numerical potential field generation methods. To overcome ...
Characterization of Die Stresses in Large Area Array Flip Chip Packages
(2008-09-09)
Microprocessor packaging in modern workstations and servers often consists of one or more large flip chip die that are mounted to a high performance ceramic chip carrier. The final assembly configuration features a complex ...
Wear Simulation of Electrical Contacts Subjected to Vibrations
(2008-09-09)
Electrical contacts may be subjected to wear because of shock, vibration, and thermo-mechanical stresses resulting in fretting, increase in contact resistance, and eventual failure over the lifetime of the product. Previously, ...
GPS/INS Operation in Shadowed Environments
(2008-09-09)
This thesis presents the analysis techniques developed for monitoring GPS signals in harsh shadowed environments such as heavy foliage. It also details a method selected for improved performance by combining raw GPS ...
Modeling and Analysis of PZT Micropower Generator
(2009-02-23)
The goal of this research is to theoretically and experimentally investigate behaviors of a power harvesting system that was constructed with a bimorph cantilever made of Lead Zirconate Titanate (Pb[ZrxTi1-x]O3) and a ...