Lee D. Peterson

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A method is presented for selecting the subset of identified structural vibration modes to be used in finite element model correlation for structural damage detection. The method is based on a ranking of the modes using measured modal strain energy, and is a function of only the measured modal parameters. It is shown that a mode selection strategy based on(More)
NASA Langley Research Center is developing key structures and mechanisms technologies for micron-accuracy, in-space deployment of future science instruments. Achieving micron-accuracy deployment requires significant advancements in deployment mechanism design such as the revolute joint presented herein. The joint presented herein exhibits a load-cycling(More)
A new method is presented for identifying the local stiffness of a structure from vibration test data. The method is based on a projection of the experimentally measured flexibility matrix onto the strain energy distribution in local elements or regional superelements. Using both a presumed connectivity and a presumed strain energy distribution pattern, the(More)
Research in the deep terrestrial biosphere is driven by interest in novel biodiversity and metabolisms, biogeochemical cycling, and the impact of human activities on this ecosystem. As this interest continues to grow, it is important to ensure that when subsurface investigations are proposed, materials recovered from the subsurface are sampled and preserved(More)
Culminating five years of planning by faculty and students, the Integrated Teaching and Learning (ITL) Laboratory opened its doors in January 1997. One of the goals of the new facility is to link theory and experimentation in a hands-on way. Custom designed LabStations facilitate this goal with the capability to easily take quantitative measurements from an(More)
  • Mark S. Lake, Lee D. Peterson, M. Roman Hachkowski, Jason D. Hinkle, Lisa R. Hardaway
  • 1998
The present paper summarizes results from an ongoing research program conducted jointly by the University of Colorado and NASA Langley Research Center since 1994. This program has resulted in general guidelines for the design of high-precision deployment mechanisms, and tests of prototype deployable structures incorporating these mechanisms have shown(More)
Software Defined Networking (SDN) is a paradigm where a software based controller governs the overall network behavior. SDN promotes centralization of network by separating the networks control plane from its data plane. OpenFlow, one of the techniques of SDN technology, is a new approach to networking. This paper discusses application aware routing and(More)
The adoption of Wireless Mesh Networks (WMNs) is a solution to provide last mile indoor and outdoor Internet access and is gaining an important attention academic and industry research groups in recent years. WMNs will support the distribution of diverse type of services, ranging from battlefield surveillance to high quality mobile audio and video(More)
Technologies are deemed strategic if they strive to address NASA's and JPL's grand challenges and aspirations. Examples of fundamental challenges that we and our technologies will be called upon to address are: What is the concentration of carbon dioxide and other greenhouse gases that the atmosphere and oceans • can absorb without crossing climatic tipping(More)