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BEGIN:VEVENT
SUMMARY:Linkage-Based Movable Bridges: Design and Optimization
DTSTART:20120529T150000
DTEND:20120529T160000
DTSTAMP:20260509T103417Z
UID:505ac3cdacc7e597f062276763a676226db63926ec8c41349445f24c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Ashley P. Thrall\, Cardinal John O'Hara\, C.S.C. Assistant Pro
 fessor\, Department of Civil Engineering and Geological Sciences\, Univers
 ity of Notre Dame (Notre Dame\, Indiana\, USA).\n\nThe trend in movable br
 idge design over the last century has been to select simple forms for basc
 ule\, swing\, and vertical lift bridges that have a minimum number of movi
 ng parts.  Recent advances in technology\, however\, have resulted in a r
 enewed interest in innovative forms.  With this renewed interest in mind\
 , this presentation will explore the use of linkages as the main kinematic
  and structural elements of movable bridges.  Linkages\, though widely us
 ed in machines and in deployable structures\, have rarely been employed in
  movable bridge design.  The presentation will first describe a design me
 thodology for linkage-based movable bridges which includes 1) physical sha
 pe-finding to arrive at conceptual designs\, 2) generating parametric mode
 ls and kinematic equations\, and 3) shape and sizing structural optimizati
 on using heuristic algorithms such as simulated annealing. Multi-objective
  structural optimization for minimum self-weight and minimum force require
 d for operation is utilized to determine a pareto-optimal set of designs t
 hat meet the constraints of current American bridge design code and meet c
 ompatibility equations for prescribed kinematic behavior. Based on design 
 priorities\, this approach allows for the selection of a final solution. T
 his methodology will be demonstrated for three novel forms which meet the 
 design requirements for the Woodrow Wilson Bridge Design Competition (Nove
 mber 1998) site - a crossing between Alexandria\, Virginia and Oxon Hill\,
  Maryland\, USA.  The presentation will conclude with a brief discussion 
 of the on-going research projects of the Kinetic Structures Laboratory at 
 the University of Notre Dame (Notre Dame\, Indiana\, USA).
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STATUS:CONFIRMED
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