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contributor authorHüls, Matthias
contributor authorPanning-von Scheidt, Lars
contributor authorWallaschek, Jörg
date accessioned2019-03-17T11:00:36Z
date available2019-03-17T11:00:36Z
date copyright12/4/2018 12:00:00 AM
date issued2019
identifier issn0742-4795
identifier othergtp_141_04_041022.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4256517
description abstractAmong the major concerns for high aspect-ratio, turbine blades are forced and self-excited (flutter) vibrations, which can cause failure by high-cycle fatigue (HCF). The introduction of friction damping in turbine blades, such as by coupling of adjacent blades via under platform dampers, can lead to a significant reduction of resonance amplitudes at critical operational conditions. In this paper, the influence of basic geometric blade design parameters onto the damped system response will be investigated to link design parameters with functional parameters like damper normal load, frequently used in nonlinear dynamic analysis. The shape of a simplified turbine blade is parameterized along with the under platform damper configuration. The airfoil is explicitly included into the parameterization in order to account for changes in blade mode shapes. For evaluation of the damped system response, a reduced-order model for nonlinear friction damping is included into an automated three-dimensional (3D) finite element analysis (FEA) tool-chain. Based on a design of experiments approach, the design space will be sampled and surrogate models will be trained on the received dataset. Subsequently, the mean and interaction effects of the geometric design parameters onto the resonance amplitude and safety against HCF will be outlined. The HCF safety is found to be affected by strong secondary effects onto static and resonant vibratory stress levels. Applying an evolutionary optimization algorithm, it is shown that the optimum blade design with respect to minimum vibratory response can differ significantly from a blade designed toward maximum HCF safety.
publisherThe American Society of Mechanical Engineers (ASME)
titleInfluence of Geometric Design Parameters Onto Vibratory Response and High-Cycle Fatigue Safety for Turbine Blades With Friction Damper
typeJournal Paper
journal volume141
journal issue4
journal titleJournal of Engineering for Gas Turbines and Power
identifier doi10.1115/1.4040732
journal fristpage41022
journal lastpage041022-10
treeJournal of Engineering for Gas Turbines and Power:;2019:;volume( 141 ):;issue: 004
contenttypeFulltext


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