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SEA Applied to the Prediction of High Frequency Vibrations in Aircraft Engines

Project description

Better models will ensure new aerospace engines give us good vibrations

The latest advanced aeroengine designs target significantly enhanced efficiency to support reduced fuel consumption and emissions. These are likely to increase high-frequency vibrations because of changes in things like airflow or turbofan diameter. Understanding the impact of the propagation of such vibrations on the aeroengine and the aircraft itself is fundamental to design for performance and safety. Conventional finite element analyses face limitations and statistical energy analysis (SEA), much better suited, faces challenges requiring complete understanding of the structure to be studied. The EU-funded VibSEA will fill the gap with an extensive experimental campaign to collect data, inform an SEA model and validate it for use in future designs.

Objective

Designed to achieve reduction in fuel consumption, the Ultra-High Bypass and High Propulsive Efficiency Geared Turbofan engine incorporates evolutions likely to produce high frequency (HF) vibration excitations which propagate through the structure. Numerical simulation is an efficient tool to control vibrations hence supporting the mechanical design. Where Finite Element (FE) based approaches show limitations due to computational hardware performances and HF dispersion management, Statistical Energy Analysis (SEA) stand as proven and effective method for this frequency range to predict the vibrational energy transfers across partitions – subsystems – of a structure. Challenges of SEA modelling consist of the structure partitioning which usually requires expertise and the accuracy loss at lower frequencies where the high stiffness of parts or complexity of junctions counter the method initial assumptions. Those statements depend strongly on the studied structure, therefore the objective of the proposed project is to develop and demonstrate a SEA modelling process to predict the vibration propagated in a typical complex engine frame. In this scope, best modelling practices from detailed numerical analysis are engaged to both support an extensive test campaign preparation including test vehicle design and manufacture, and produce models covering the target frequency range: from 400Hz to 10kHz. A crucial phase consists in the validation and update of these models from tests post-processing techniques and known methods such as Experimental SEA, Decay Rate damping estimation or input conductance as well as innovative inverse approaches relying on optimization loops. From the comprehensive comparison of these different methods with tests results, a best methods and associated modelling practices are delivered to the topic leader. CETIM and ESI join their complementary competences to develop the modelling and experimental know how applied to the HF vibrations assessment.

Coordinator

CENTRE TECHNIQUE DES INDUSTRIES MECANIQUES
Net EU contribution
€ 495 128,00
Address
Avenue felix louat 52
60304 Senlis cedex
France

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Region
Hauts-de-France Picardie Oise
Activity type
Research Organisations
Links
Total cost
€ 495 128,75

Participants (2)