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SUMMARY:A linearised Hybrid FE-SEA method for nonlinear structures under r
 andom loading - Henry Allen\, CUED
DTSTART:20240531T150000Z
DTEND:20240531T160000Z
UID:TALK213319@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:In the mid-frequency range\, a systems vibrational response be
 comes sensitive to structural uncertainties. This in combination with the 
 small length scale of deformation requires deterministic approaches such a
 s the Finite Element (FE) method to run expensive high degree-of-freedom M
 onte-Carlo simulations. Coupling Statistical Energy Analysis (SEA)\, a wel
 l-established high frequency technique\, to the FE method leads to far gre
 ater efficiency in predicting response statistics of built-up systems. Thi
 s approach is known as the Hybrid FE-SEA method. A limitation of this tech
 nique is that it was developed for linear systems\, this restricts the app
 lications since in practical engineering systems nonlinearities are likely
  to be present. In this work\, a linearisation scheme is developed for a g
 eneral ensemble of nonlinear random systems under stochastic loading but w
 hich is applicable to the Hybrid FE-SEA method. This required significant 
 extension of the Hybrid FE-SEA method\, by introducing a framework for pre
 -averaged stochastic random loads developed in conjunction with broadband-
 averaging of response statistics. Although developed for nonlinear systems
  both extensions to the theory have applications to linear systems. A benc
 hmark study with a Lagrange Rayleigh-Ritz model employing Monte Carlo simu
 lations has been used to assess the linearised Hybrid FE-SEA method.
LOCATION:JDB Seminar Room\, CUED
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