Nathan Sorensen

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In the exploration and implementation of formation control strategies, communication range and bandwidth limitations form a barrier to large scale formation control applications. The limitations of current formation control strategies involving a leader–follower approach and a consensus-based approach with fully available group trajectory information are(More)
In this brief, consensus algorithms are experimentally implemented and validated on a mobile actuator and sensor network platform under directed, possibly switching interaction topologies to explore issues and challenges in distributed multivehicle cooperative control. Distributed consensus algorithms are applied to two target applications including(More)
In this paper, we experimentally implement and validate distributed consensus algorithms on a mobile actuator and sensor network platform under directed, possibly switching interaction topologies to explore issues and challenges in distributed multi-vehicle cooperative control. Distributed consensus algorithms are applied to three target applications namely(More)
Distributed cooperative control strategies account for communication range and bandwidth limitations. While various distributed cooperative control strategies have been studied in theory, few of them have been systematically validated on experimental platforms. This paper demonstrates experimental results of consensus-based distributed cooperative control(More)
Cooperative control in the presence of a limited communication range poses significant theoretical and practical challenges. Some control strategies in this area rely on information relay where all information received by any vehicle is passed to all other vehicles that it communicates with. Some other control strategies in this area are based on local(More)
A program is underway at Sandia National Laboratories to predict long-term reliability of photovoltaic (PV) systems. The vehicle for the reliability predictions is a system performance model, currently being run under a simulation software called GoldSimTM. The model includes inputs for module performance, irradiance, and degradation. In order to be truly(More)
This paper describes efforts to characterize different aspects of photovoltaic connector reliability. The resistance variation over a population of connections was examined by measuring 75 connectors from three different manufacturers. The comparison shows differences in average resistance of up to 9% between manufacturers. The standard deviation of(More)
A program is underway at Sandia National Laboratories to predict long-term reliability of photovoltaic systems. The vehicle for the reliability predictions is a Reliability Block Diagram (RBD), which models system behavior. Because this model is based mainly on field failure and repair times, it cannot currently be used to accurately predict end-of-life. In(More)
An analytical capability is being developed that can be used to predict the effect of corrosion on the performance of electrical circuits and systems. The availability of this “toolset” will dramatically improve our ability to influence device and circuit design, address and remediate field occurrences, and determine real limits for circuit service life. In(More)