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research-article

Influence of Geometric Design Parameters onto Vibratory Response and HCF Safety for Turbine Blades with Friction Damper

[+] Author and Article Information
Matthias Huels

Siemens AG, Mellinghofer Straße 55, 45473, Mülheim a. d. Ruhr, Germany
matthias.huels.ext@siemens.com

Lars Panning-von Scheidt

Institute of Dynamics and Vibration Research, Leibniz University Hannover, 30167, Hannover, Germany
panning@ids.uni-hannover.de

Jörg Wallaschek

Institute of Dynamics and Vibration Research, Leibniz University Hannover, 30167, Hannover, Germany
wallaschek@ids.uni-hannover.de

1Corresponding author.

ASME doi:10.1115/1.4040732 History: Received June 22, 2018; Revised June 25, 2018

Abstract

Among the major concerns for high aspect-ratio turbine blades are forced and self-excited (flutter) vibrations which can cause failure by high-cycle fatigue. 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 non-linear friction damping is included into an automated 3D FEA tool-chain. Based on a design of experiments approach, the design space will be sampled and surrogate models are trained on the received dataset. Subsequently, the mean and interaction effects of the geometric design parameters onto the resonance amplitude and safety against high-cycle fatigue 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.

Copyright (c) 2018 by ASME
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