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Optimal Sensor Placement for Structural Health Monitoring (open access)

Optimal Sensor Placement for Structural Health Monitoring

In large-scale civil structures, a limited number of sensors are placed to monitor the health of civil structures to reduce maintenance, communication and energy costs. In this thesis, the problem of optimal sensor location placement to infer the health of civil structures is explored. First, a comparative study of approaches from the fields of control engineering and civil engineering is conducted . The widely used civil engineering approaches such as effective independence (EI) and modal assurance criterion (MAC) have limitations because of the negligence of modes and damping parameters. On the other hand, control engineering approaches consider the entire system dynamics using impulse response-type sensor measurement data. Such inference can be formulated as an estimation problem, with the dynamics formulated as a second-order differential equation. The comparative study suggests that damping dynamics play significant impact to the selection of best sensor location---the civil engineering approaches that neglect the damping dynamics lead to very different sensor locations from those of the control engineering approaches. In the second part of the thesis, an initial attempt to directly connect the topological graph of the structure (that defines the damping and stiffness matrices) and the second-order dynamics is conducted.
Date: December 2014
Creator: Movva, Gopichand
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Vincent Charles (Bud) Perini, Jr.: A Life in Photographs (open access)

Vincent Charles (Bud) Perini, Jr.: A Life in Photographs

A book about the life of Vincent Charles "Bud" Perini, Jr., including brief biographical text and compiled photographs with captions.
Date: 2014
Creator: Perini, Charles W.
Object Type: Book
System: The Portal to Texas History
Colorado: Observed Trends and Projected Future Conditions for Climate Change Preparedness and Resilience (open access)

Colorado: Observed Trends and Projected Future Conditions for Climate Change Preparedness and Resilience

The U.S. Global Change Research Program supported several regional workshops in October 2014 as part of the Climate Change Preparedness and Resilience Exercise Series, sponsored by the White House in collaboration with the Federal Emergency Management Agency National Exercise Division. This brochure was used for the second workshop, which took place in Fort Collins, CO, with support from the State of Colorado and DOE.
Date: October 2014
Creator: U.S. Global Change Research Program
Object Type: Pamphlet
System: The UNT Digital Library