Reference number : GC-2017-Q1-00441, amendment number : , agreement type : G, recipient legal name : Gosselin, Frederick (École Polytechnique de Montréal), 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 : Modern hydroelectric turbines are designed to achieve near perfect efficiency while keeping production costs_x000D_
as low as possible. One way to accomplish such a goal is by reducing the thickness of turbine blades,_x000D_
consequently lowering their stiffness and increasing their propensity to experience critical vibration levels._x000D_
Moreover, the end-users' growing need for power regulation due to the integration of intermittent renewable_x000D_
sources leads to more frequent off-design operations as well as machine starts and stops, for which dynamic_x000D_
mechanical stresses are significantly higher than at best efficiency point. In this context, precise knowledge of_x000D_
the turbine dynamic characteristics, notably the variation of the natural frequencies of the rotor with rotation_x000D_
rate, is essential to avoid problematic vibrations. In many publications, pump-turbine runners have been_x000D_
modelled using a rotating disk submerged in water, highlighting the phenomenon of frequency split: a forward_x000D_
and a backward travelling waves emerge as the disk rotate. This phenomenon is linked to the variation of added_x000D_
mass with rotational velocity. The project has two main objectives: understand better the mechanism of_x000D_
frequency split; and develop a simplified simulation strategy to evaluate the natural frequencies of a rotating_x000D_
disk. Understanding the frequency split of pump-turbine runners and its underlying mechanisms is critical to_x000D_
evaluate the resulting stresses and the expected life of the machine. This project will provide an accurate and_x000D_
fast tool to improve the design of high head Francis turbines and pump-turbines. This tool is essential to_x000D_
develop new reliable turbines and provide detailed information about the fatigue life of the equipment., program purpose french : Modern hydroelectric turbines are designed to achieve near perfect efficiency while keeping production costs_x000D_
as low as possible. One way to accomplish such a goal is by reducing the thickness of turbine blades,_x000D_
consequently lowering their stiffness and increasing their propensity to experience critical vibration levels._x000D_
Moreover, the end-users' growing need for power regulation due to the integration of intermittent renewable_x000D_
sources leads to more frequent off-design operations as well as machine starts and stops, for which dynamic_x000D_
mechanical stresses are significantly higher than at best efficiency point. In this context, precise knowledge of_x000D_
the turbine dynamic characteristics, notably the variation of the natural frequencies of the rotor with rotation_x000D_
rate, is essential to avoid problematic vibrations. In many publications, pump-turbine runners have been_x000D_
modelled using a rotating disk submerged in water, highlighting the phenomenon of frequency split: a forward_x000D_
and a backward travelling waves emerge as the disk rotate. This phenomenon is linked to the variation of added_x000D_
mass with rotational velocity. The project has two main objectives: understand better the mechanism of_x000D_
frequency split; and develop a simplified simulation strategy to evaluate the natural frequencies of a rotating_x000D_
disk. Understanding the frequency split of pump-turbine runners and its underlying mechanisms is critical to_x000D_
evaluate the resulting stresses and the expected life of the machine. This project will provide an accurate and_x000D_
fast tool to improve the design of high head Francis turbines and pump-turbines. This tool is essential to_x000D_
develop new reliable turbines and provide detailed information about the fatigue life of the equipment., agreement title english : Frequency and vibration amplitude prediction of rotating discs subject to mode splitting, agreement title french : Frequency and vibration amplitude prediction of rotating discs subject to mode splitting, agreement number : EGP, agreement value : 25000.0, agreement start date : 2017-04-25, 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