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Establishing Blend Repair limit of blisks –from A perspective of Vibration amplificatiOn

Total Cost €


EC-Contrib. €






 BRAVO project word cloud

Explore the words cloud of the BRAVO project. It provides you a very rough idea of what is the project "BRAVO" about.

fundamental    maximum    geometric    simulations    deviations    contractors    aeroengines    er    predictive    maturity    extremely    limits    possessing    model    bench    damaged    wave    scientific    bladed    rational    potentially    operations    issue    subject    relying    blisk    traveling    exacerbate    blades    tool    underlying    forced    professional    leader    industrial    variances    capability    size    disk    mistuning    employing    innovative    excitation    modal    measured    limit    spinning    scanning    bravo    cycle    dynamics    transferable    3d    fails    blends    expensive    exert    interdisciplinary    vibration    deterministic    skills    intrinsic    independence    blended    industry    sustainment    efficient    competence    allowable    optical    philosophy    blend    accounted    geometry    extensive    optically    group    competitiveness    repair    limited    tests    deepened    reliability    supervisor    rig    benefit    excessive    blending    population    location    probabilistic    blade    aviation    holistic    evaluation    fatigue    blisks    repaired   

Project "BRAVO" data sheet

The following table provides information about the project.


Organization address
city: TORINO
postcode: 10129

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country Italy [IT]
 Total cost 183˙473 €
 EC max contribution 183˙473 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2019
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2020
 Duration (year-month-day) from 2020-09-16   to  2022-09-15


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    POLITECNICO DI TORINO IT (TORINO) coordinator 183˙473.00


 Project objective

Efficient sustainment of the extremely expensive blisks in advanced aeroengines requires that damaged blades can be cost-effectively repaired by blending operations with high reliability. However, limited understanding of blending effects on the forced response of blisks challenges the rational determination of blend limits, i.e., the maximum allowable blend size, location and number in a damaged blisk. The underlying fundamental issue is whether or not the blends will exacerbate the intrinsic geometric mistuning such that the blisk is subject to excessive vibration level and fails from high cycle fatigue.

The project BRAVO aims to develop a comprehensive vibration evaluation tool for blended blisks and establish the repair philosophy on blend limits. By employing the state-of-the-art 3D optical geometry scanning technology, geometry variances due to both blends and intrinsic blade geometric deviations can be effectively accounted for. Major scientific advances include: Novel deterministic methodologies of forced response analysis for blended blisks relying on the optically based as-measured model. Holistic vibration evaluation of blended blisks by comparing the as-measured-model-based simulations, modal tests, bench test under traveling wave excitation and spinning rig tests. Innovative probabilistic assessment for predictive evaluation of a population of possible blends and further determination of a tailored blend limit for a damaged blisk.

A highly interdisciplinary collaboration will benefit both the ER with extensive experience in bladed disk dynamics, and the supervisor possessing top-level research capability in blade vibration testing. With deepened competence in both technical and transferable skills, the ER will reach a high level of professional maturity and scientific independence as a group leader.

Results will potentially exert a strong industrial impact for repair contractors, contributing to the competitiveness of European aviation industry.

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The information about "BRAVO" are provided by the European Opendata Portal: CORDIS opendata.

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