UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a given thesis/dissertation in DRUM.

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Subject: search.filters.subject.Cyber-physical systems

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    Structural performance evaluation and optimization through cyber-physical systems using substructure real-time hybrid simulation
    (2017) Zhang, Ruiyang; Phillips, Brian M; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Natural hazards continue to demonstrate the vulnerability of civil infrastructure worldwide. Engineers are dedicated to improving structural performance against natural hazards with improved design codes and computational tools. These improvements are often driven by experiments. Experimental testing not only enables the prediction of structural responses under those dynamic loads but also provide a reliable way to investigate new solutions for hazard mitigation. Common experimental techniques in structural engineering include quasi-static testing, shake table testing, and hybrid simulation. In recent years, real-time hybrid simulation (RTHS) has emerged as a powerful alternative to drive improvements in civil infrastructure as the entire structure’s dynamic performance is captured with reduced experimental requirements. In addition, RTHS provides an attractive opportunity to investigate the optimal performance of complex structures or components against multi-hazards by embedding it in an optimization framework. RTHS stands to accelerate advancements in civil engineering, in particular for designing new structural systems or devices in a performance-based design environment. This dissertation focuses on the use of cyber-physical systems (CPS) to evaluate structural performance and achieve optimal designs for seismic protection. This dissertation presents systematic studies on the development and validation of the dynamic substructuring RTHS technique using shake tables, novel techniques in increasing RTHS stability by introducing artificial damping to an under-actuated physical specimen, and the optimal design of the structure or supplemental control devices for seismic protection through a cyber-physical substructure optimization (CPSO) framework using substructure RTHS.
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    OPTIMIZATION IN WIND ENGINEERING USING CYBER-PHYSICAL SYSTEMS FOR THE DESIGN OF PARAPET WALLS
    (2017) Whiteman, Michael Lee; Phillips, Brian M; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Wind-related hazards are becoming an increasing threat as vulnerable coastal locations within the United States continue to see steady population growth. The lack of a corresponding increase in evacuation route capacity means coastal cities will need to rely on shelter-in-place strategies. The significant loss of life and economic impact from windstorms coupled with the expected population increase in vulnerable areas accentuates the need to develop new economical approaches to design and construct buildings capable of surviving extreme wind events. This thesis investigates the use of cyber-physical systems to optimize the structural design of wind-sensitive structures. The proposed design framework combines the efficiency of numerically guided optimization algorithms with the accuracy of boundary layer wind tunnel testing. The focus of this thesis is the development and evaluation of a cyber-physical approach to wind engineering design and its application to the design of a parapet for a low-rise building.