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Wind and Structures
  Volume 21, Number 4, October 2015, pages 425-442
DOI: http://dx.doi.org/10.12989/was.2015.21.4.425
 


Processing of dynamic wind pressure loads for temporal simulations
Pascal Hémon

 
Abstract
    This paper discusses the processing of the wind loads measured in wind tunnel tests by means of multi-channel pressure scanners, in order to compute the response of 3D structures to atmospheric turbulence in the time domain. Data compression and the resulting computational savings are still a challenge in industrial contexts due to the multiple trial configurations during the construction stages. The advantage and robustness of the bi-orthogonal decomposition (BOD) is demonstrated through an example, a sail glass of the Fondation Louis Vuitton, independently from any tentative physical interpretation of the spatio-temporal decomposition terms. We show however that the energy criterion for the BOD has to be more rigorous than commonly admitted. We find a level of 99.95 % to be necessary in order to recover the extreme values of the loads. Moreover, frequency limitations of wind tunnel experiments are sometimes encountered in passing from the scaled model to the full scale structure. These can be alleviated using a spectral extension of the temporal function terms of the BOD.
 
Key Words
    pressure loads; wind tunnel; wind gust; temporal simulation; bi-orthogonal decomposition
 
Address
Pascal Hémon:LadHyX, CNRS-Ecole Polytechnique, F-91128 Palaiseau, France
 

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