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Now showing items 351-360 of 428
Study of the Mechanical Behavior of Lead-free Solder Joints and Its Individual Phases under Various Harsh Environments
(2021-04-27)
Solder joints provide mechanical support, electrical and thermal interconnection between packaging levels in microelectronics assembly systems. Proper functioning of these interconnections and the reliability of the ...
Detection of GNSS Faults Using Receiver Clock Drift Estimates
(2021-05-25)
GNSS based navigation systems are used in almost every sector, from industrial and agricultural environments to everyday applications such as personal navigation or autonomous vehicles. Satellite navigation provides accurate ...
Design, Simulation, and Precision Manufacturing of Flexible-Backing, Morphing Composite Metamaterials that Lock Suddenly in Global Bending
(2021-04-30)
Few composite structures, let alone single materials, are known that undergo sudden but reversible stiffening at a pre-engineered strain profile, especially in global bending. This research builds upon this author’s previous ...
Design and Analysis of Acoustic Metamaterials in Order to Isolate Microelectromechanical Systems Devices from High Frequency Acoustic Noise
(2021-07-30)
The effects of high frequency acoustic noise can be rather damaging to Microelectromechanical Systems (MEMS) devices. The use of MEMS devices is widespread; therefore, some operational environments for MEMS devices can ...
Evaluation of Cooperative Navigation Strategies with Maneuvering UAVs
(2021-07-27)
This thesis presents and evaluates cooperative navigation methods used to reduce navigation solution error growth between members of an unmanned aerial vehicle - unmanned ground vehicle (UAV-UGV) or all-UAV team when Global ...
Utilizing Hidden Markov Models to Classify Maneuvers and Improve Estimates of an Unmanned Aerial Vehicle During High Dynamic Flight
(2021-07-28)
Unmanned Aerial Vehicles (UAVs) are an increasing presence around the world; however, they can pose a threat to secure facilities. Many UAV mitigation techniques require accurate knowledge of UAV states to successfully ...
Study of the Effect of Mechanical Cycling on the Constitutive Behavior of Lead-Free Solders
(2021-08-05)
Solder joints in electronic assemblies are often subjected to cyclic (positive/negative) mechanical strains and stresses. Such exposures can occur in variable temperature application environments or during accelerated life ...
Online Rotational Self-Calibration of LiDAR Sensors when Mounted on a Ground Vehicle
(2021-08-06)
This thesis presents a method for online extrinsic rotational calibration of a LiDAR sensor
with minimal manual intervention. The approach leverages the expected geometry of structured
environments common to ground ...
A GPS L5 Software Defined Vector Tracking Receiver
(2021-08-11)
As the world continues towards autonomy, the need for continuous, precise, and robust navigation is becoming increasingly important. A new wave of modernized Global Navigation Satellite Systems (GNSS) signals are currently ...
Mechanical Behavior and Microstructural Evolution of SAC and SAC+Bi Solder Alloys in Harsh Environment Applications
(2021-08-16)
The microstructure and mechanical properties of lead free solder joints in electronic assemblies are constantly evolving when exposed to isothermal aging. These changes lead to dramatic reductions in reliability of lead ...