Efficient structural analysis of gas turbine blades

Timo Rogge (Institute of Structural Analysis, Hanover, Germany)
Ricarda Berger (Institute of Structural Analysis, Hanover, Germany)
Linus Pohle (Institute of Dynamics and Vibration Research, Hanover, Germany)
Raimund Rolfes (Institute of Structural Analysis, Hanover, Germany)
Jörg Wallaschek (Institute of Dynamics and Vibration Research, Hanover, Germany)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Publication date: 14 November 2018

Abstract

Purpose

The purpose of this study a fast procedure for the structural analysis of gas turbine blades in aircraft engines. In this connection, investigations on the behavior of gas turbine blades concentrate on the analysis and evaluation of starting dynamics and fatigue strength. Besides, the influence of structural mistuning on the vibration characteristics of the single blade is analyzed and discussed.

Design/methodology/approach

A basic computation cycle is generated from a flight profile to describe the operating history of the gas turbine blade properly. Within an approximation approach for high-frequency vibrations, maximum vibration amplitudes are computed by superposition of stationary frequency responses by means of weighting functions. In addition, a two-way coupling approach determines the influence of structural mistuning on the vibration of a single blade. Fatigue strength of gas turbine blades is analyzed with a semi-analytical approach. The progressive damage analysis is based on MINER’s damage accumulation assuming a quasi-stable behavior of the structure.

Findings

The application to a gas turbine blade shows the computational capabilities of the approach presented. Structural characteristics are obtained by robust and stable computations using a detailed finite element model considering different load conditions. A high quality of results is realized while reducing the numerical costs significantly.

Research limitations/implications

The method used for analyzing the starting dynamics is based on the assumption of a quasi-static state. For structures with a sufficiently high stiffness, such as the gas turbine blades in the present work, this procedure is justified. The fatigue damage approach relies on the existence of a quasi-stable cyclic stress condition, which in general occurs for isotropic materials, as is the case for gas turbine blades.

Practical implications

Owing to the use of efficient analysis methods, a fast evaluation of the gas turbine blade within a stochastic analysis is feasible.

Originality/value

The fast numerical methods and the use of the full finite element model enable performing a structural analysis of any blade structure with a high quality of results.

Keywords

Citation

Rogge, T., Berger, R., Pohle, L., Rolfes, R. and Wallaschek, J. (2018), "Efficient structural analysis of gas turbine blades", Aircraft Engineering and Aerospace Technology, Vol. 90 No. 9, pp. 1305-1316. https://doi.org/10.1108/AEAT-05-2016-0085

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Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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