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SUMMARY:PhD thesis public defense on "Mitigation of Wind-Induced Vibration
 s in Long-Span Bridges using a Distributed Flap System"
DTSTART:20160819T170000
DTSTAMP:20260506T132927Z
UID:e40cca31b542646ab7eab46da75cec0fb9e0790b3e40d03f2006bd8f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Maria Boberg\nSince the collapse of the Tacoma Narrows Bridge 
 more than 70 years ago suppressing wind-induced instabilities has been a k
 ey aspect of the design of long-span bridges. The civil engineering commun
 ity has adopted a series of design standards for wind effect mitigation of
  long-span bridges typically called passive measures. A passive solution\,
  although safe in respect to wind perturbations\, is intrinsically a stati
 c compromise for a dynamic system response to a variable and uncertain per
 turbation and as such it implies numerous limitations. Therefore\, in the 
 last two decades researchers have investigated active measures for prevent
 ing aeroelastic instabilities\, especially flutter. The underlying motivat
 ion is that an active damping mechanism can adapt to dynamic wind and stru
 cture conditions and has therefore the potential of being more efficient t
 han a passive solution despite its higher complexity and cost.\nOne of the
  most investigated and potentially highly effective active measures to enh
 ance the flutter performance of bridges is to endow their decks with array
 s of movable flaps.\nThe overall aim of this dissertation is to investigat
 e\, experimentally as well as theoretically\, the feasibility and effectiv
 eness of an intelligent\, distributed flap system for enhancing the flutte
 r performance of long-span bridges. The main contributions of this thesis 
 are three-fold. First\, we have designed a unique\, dedicated\, experiment
 al setup consisting of a bridge section model\, endowed with actively cont
 rolled flap arrays\, as well as all the necessary instrumentation for meas
 uring and perturbing the system states under controlled wind conditions\, 
 in a boundary layer wind tunnel. Secondly\, we have developed an analytica
 l model\, building on top of theoretical frameworks commonly used in civil
  engineering for long-span bridges\, and in aeronautics for wings equipped
  with ailerons and tabs. We have systematically evaluated the theoretical 
 model effort with wind tunnel experiments.\nThirdly\, we leveraged our exp
 erimental setup and analytical model in order to thoroughly investigate di
 fferent flap control coordination strategies\, an unprecedented study that
  we are uniquely equipped for.
LOCATION:BC 410 https://plan.epfl.ch/?room==BC%20410
STATUS:CONFIRMED
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