Reference number : GC-2017-Q2-00521, amendment number : , agreement type : G, recipient legal name : Sedaghati, Ramin (Concordia University)|Sedaghati, Ramin (Université Concordia), recipient country : CA, recipient province : nan, recipient city : Quebec|Québec, recipient postal code : nan, program name english : Engage Grants for Universities, program name french : Subventions d'engagement partenarial pour les universités, program purpose english : This project concerns with vibration attenuation and fatigue analysis of the towers and attached articulated_x000D_
booms in response to wind load and vortex shedding. The three-dimensional finite element model of the towers_x000D_
and booms are developed in HyperMesh, Ansys and RISA softwares. A comprehensive vibration analysis is_x000D_
conducted to identify first 10 natural frequencies and corresponding mode shapes of the structure, under_x000D_
different possible booms configurations and loading scenarios. In order to demonstrate accuracy of the model,_x000D_
the results obtained from finite element analysis, in terms of natural frequency of the articulated boom, are_x000D_
compared with those of the experiment. The experiment has been already conducted by STRUDES and the_x000D_
results are available. The experimental results along with logarithmic decrement technique and modal analysis_x000D_
are used to extract damping of the structure. The findings obtained from the finite element simulation,_x000D_
experiments and vortex shedding analysis of the booms are used to identify under what circumstances the_x000D_
resonant frequencies of the structure are excited. Furthermore, the boom deflection under resonance excitation_x000D_
is evaluated. At the end, the critical components of the structure subject to fatigue failure, due to cyclic loads,_x000D_
are identified and their fatigue lives are computed to make sure the structure operates properly during 50 years,_x000D_
without any failure. Finally, appropriate vibration damping devices or tuned vibration absorbers will be_x000D_
optimally designed to mitigate the extreme vibration due to vortex shedding., program purpose french : This project concerns with vibration attenuation and fatigue analysis of the towers and attached articulated_x000D_
booms in response to wind load and vortex shedding. The three-dimensional finite element model of the towers_x000D_
and booms are developed in HyperMesh, Ansys and RISA softwares. A comprehensive vibration analysis is_x000D_
conducted to identify first 10 natural frequencies and corresponding mode shapes of the structure, under_x000D_
different possible booms configurations and loading scenarios. In order to demonstrate accuracy of the model,_x000D_
the results obtained from finite element analysis, in terms of natural frequency of the articulated boom, are_x000D_
compared with those of the experiment. The experiment has been already conducted by STRUDES and the_x000D_
results are available. The experimental results along with logarithmic decrement technique and modal analysis_x000D_
are used to extract damping of the structure. The findings obtained from the finite element simulation,_x000D_
experiments and vortex shedding analysis of the booms are used to identify under what circumstances the_x000D_
resonant frequencies of the structure are excited. Furthermore, the boom deflection under resonance excitation_x000D_
is evaluated. At the end, the critical components of the structure subject to fatigue failure, due to cyclic loads,_x000D_
are identified and their fatigue lives are computed to make sure the structure operates properly during 50 years,_x000D_
without any failure. Finally, appropriate vibration damping devices or tuned vibration absorbers will be_x000D_
optimally designed to mitigate the extreme vibration due to vortex shedding., agreement title english : Vibration Attenuation and Fatigue Analysis of the Large Flexible Articulated Boom under Wind Load and Vortex Shedding, agreement title french : Vibration Attenuation and Fatigue Analysis of the Large Flexible Articulated Boom under Wind Load and Vortex Shedding, agreement number : EGP, agreement value : 25000.0, agreement start date : 2017-08-23, agreement end date : nan, description english : nan, description french : nan, expected results english : nan, expected results french : nan, additional information english : Grant or Award spanning more than one fiscal year (2017-2018 to 2018-2019)., additional information french : Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier (2017-2018 à 2018-2019)., owner organization : nserc-crsng, owner organization title : Natural Sciences and Engineering Research Council of Canada | Conseil de recherches en sciences naturelles et en génie du Canada