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research-article

Blackbox optimization for aircraft engine bladed components featuring contact interfaces

[+] Author and Article Information
Julien Lainé

École Polytechnique de Montréal, Département de génie mécanique, Montréal H3C 3A7, Canada
julien.laine@polymtl.ca

Elsa Piollet

École Polytechnique de Montréal, Département de génie mécanique, Montréal H3C 3A7, Canada
elsa.piollet@polymtl.ca

Florence Nyssen

École Polytechnique de Montréal, Département de génie mécanique, Montréal H3C 3A7, Canada
florence.nyssen@polymtl.ca

Alain Batailly

École Polytechnique de Montréal, Département de génie mécanique, Montréal H3C 3A7, Canada
alain.batailly@polymtl.ca

1Corresponding author.

ASME doi:10.1115/1.4042808 History: Received June 13, 2018; Revised February 05, 2019

Abstract

In modern aircraft engines, reduced operating clearances between rotating blade tips and the surrounding casing increase the risk of blade/casing structural contacts, which may lead to high blade vibration levels. Therefore, structural contacts must now be accounted for as early as in the engine design stage. As the vibrations resulting from contact are intrinsically nonlinear, direct optimization of blade shapes based on vibration simulation is not realistic in an industrial context. A recent study on a blade featuring significantly lower vibration levels following contact event identified a potential criterion to estimate a blade sensitivity to contact interactions. This criterion is based on the notion of dynamic clearance, a quantity describing the evolution of the blade/casing clearance as the blade vibrates along one of its free-vibration modes. This paper presents an optimization procedure which minimizes the dynamic clearance as a first step toward the integration of structural criteria in blade design. A dedicated blade geometry parameterization is introduced to allow for an efficient optimization of the blade shape. The optimization procedure is applied to the three-dimensional properties of two different blades. In both cases, initial and optimized blades are compared by means of an in-house numerical tool dedicated to the simulation of structural contact events with a surrounding casing. Simulation results show a significant reduction of vibration levels following contact interactions for the optimized blades. Critical speeds related to the mode on which the dynamic clearance is computed are successfully eliminated by the blade shape optimization.

Copyright (c) 2019 by ASME
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