Abstract
When designing gas turbines for power plants that use fossil fuels it is necessary not only to consider environmental impacts, but also to improve estimation accuracy for both strength and vibration. We developed a new evaluation method, using a vibration exciter, for use during the design process. Our results show that as shank pin load, shroud cover load, and centrifugal force load increase, the damping ratio of the turbine bucket decrease. In our tests the damping ratio decreased by as much as 30% as shank pin load increased, up to 50% as the shroud cover load increased, and up to 30% as centrifugal force load increased. Consequently, the vibration characteristics of a turbine bucket can be evaluated by the method described herein.
