Experimental validation of FEM-computed stress to tip deflection ratios of aero-engine compressor blade vibration modes and quantification of associated uncertainties

Mohamed Elsayed Mohamed; Philip Bonello; Peter Russhard; Pavel Procházka; Mohammed Lamine Mekhalfia; Eder Batista Tchawou Tchuisseu

doi:10.1016/j.ymssp.2022.109257

Experimental validation of FEM-computed stress to tip deflection ratios of aero-engine compressor blade vibration modes and quantification of associated uncertainties

Mohamed Elsayed Mohamed, Philip Bonello, Peter Russhard, Pavel Procházka, Mohammed Lamine Mekhalfia, Eder Batista Tchawou Tchuisseu

Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

Blade Tip Timing (BTT) technology is concerned with the estimation of turbomachinery blade stresses. The stresses are determined from BTT data by relating the measured tip deflection to the stresses via Finite Element (FE) models. The correlation of BTT measurements with FE predictions involves a number of uncertainties.
This paper presents the process for validating the FE stress and deflection predictions of aero-engine compressor blades under non-rotation conditions as a critical preliminary step towards the complete understanding of their dynamic behaviour under rotating conditions when using BTT measurements. The
process steps are described in detail, including the FE modelling and analysis of the blades and the blade-disk assembly, and the measurements of the blade tip deflection and blade stress. Furthermore, the uncertainties associated with the FE modelling and the measurement processes are quantified. The results show that the FE model is valid considering the control of most uncertainties. The experimental validation of the FE-computed stress-to-tip deflection calibration factors in the present study provides the basis for the determination of the
calibration factors under rotational conditions using a previously presented BTT data simulator, and for the design of corresponding rotating experiments using BTT.

Keywords: Blade tip timing, FEM validation, Vibration measurements, Blade stresses

Original language	English
Pages (from-to)	109257
Journal	Mechanical Systems and Signal Processing
Volume	178
Early online date	12 May 2022
DOIs	https://doi.org/10.1016/j.ymssp.2022.109257
Publication status	Published - 1 Oct 2022

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10.1016/j.ymssp.2022.109257Licence: CC BY

https://linkinghub.elsevier.com/retrieve/pii/S0888327022004058

Batista (Blade Tip Timing System Validator) - Clean Sky 2 - 862034
Bonello, P. (PI)
2/09/19 → 1/09/21
Project: Research

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Mohamed, M. E., Bonello, P., Russhard, P., Procházka, P., Mekhalfia, M. L., & Tchuisseu, E. B. T. (2022). Experimental validation of FEM-computed stress to tip deflection ratios of aero-engine compressor blade vibration modes and quantification of associated uncertainties. Mechanical Systems and Signal Processing, 178, 109257. https://doi.org/10.1016/j.ymssp.2022.109257

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title = "Experimental validation of FEM-computed stress to tip deflection ratios of aero-engine compressor blade vibration modes and quantification of associated uncertainties",

abstract = "Blade Tip Timing (BTT) technology is concerned with the estimation of turbomachinery blade stresses. The stresses are determined from BTT data by relating the measured tip deflection to the stresses via Finite Element (FE) models. The correlation of BTT measurements with FE predictions involves a number of uncertainties. This paper presents the process for validating the FE stress and deflection predictions of aero-engine compressor blades under non-rotation conditions as a critical preliminary step towards the complete understanding of their dynamic behaviour under rotating conditions when using BTT measurements. The process steps are described in detail, including the FE modelling and analysis of the blades and the blade-disk assembly, and the measurements of the blade tip deflection and blade stress. Furthermore, the uncertainties associated with the FE modelling and the measurement processes are quantified. The results show that the FE model is valid considering the control of most uncertainties. The experimental validation of the FE-computed stress-to-tip deflection calibration factors in the present study provides the basis for the determination of the calibration factors under rotational conditions using a previously presented BTT data simulator, and for the design of corresponding rotating experiments using BTT.Keywords: Blade tip timing, FEM validation, Vibration measurements, Blade stresses",

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Experimental validation of FEM-computed stress to tip deflection ratios of aero-engine compressor blade vibration modes and quantification of associated uncertainties. / Mohamed, Mohamed Elsayed; Bonello, Philip; Russhard, Peter et al.
In: Mechanical Systems and Signal Processing, Vol. 178, 01.10.2022, p. 109257.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Experimental validation of FEM-computed stress to tip deflection ratios of aero-engine compressor blade vibration modes and quantification of associated uncertainties

AU - Mohamed, Mohamed Elsayed

AU - Bonello, Philip

AU - Russhard, Peter

AU - Procházka, Pavel

AU - Mekhalfia, Mohammed Lamine

AU - Tchuisseu, Eder Batista Tchawou

PY - 2022/10/1

Y1 - 2022/10/1

N2 - Blade Tip Timing (BTT) technology is concerned with the estimation of turbomachinery blade stresses. The stresses are determined from BTT data by relating the measured tip deflection to the stresses via Finite Element (FE) models. The correlation of BTT measurements with FE predictions involves a number of uncertainties. This paper presents the process for validating the FE stress and deflection predictions of aero-engine compressor blades under non-rotation conditions as a critical preliminary step towards the complete understanding of their dynamic behaviour under rotating conditions when using BTT measurements. The process steps are described in detail, including the FE modelling and analysis of the blades and the blade-disk assembly, and the measurements of the blade tip deflection and blade stress. Furthermore, the uncertainties associated with the FE modelling and the measurement processes are quantified. The results show that the FE model is valid considering the control of most uncertainties. The experimental validation of the FE-computed stress-to-tip deflection calibration factors in the present study provides the basis for the determination of the calibration factors under rotational conditions using a previously presented BTT data simulator, and for the design of corresponding rotating experiments using BTT.Keywords: Blade tip timing, FEM validation, Vibration measurements, Blade stresses

AB - Blade Tip Timing (BTT) technology is concerned with the estimation of turbomachinery blade stresses. The stresses are determined from BTT data by relating the measured tip deflection to the stresses via Finite Element (FE) models. The correlation of BTT measurements with FE predictions involves a number of uncertainties. This paper presents the process for validating the FE stress and deflection predictions of aero-engine compressor blades under non-rotation conditions as a critical preliminary step towards the complete understanding of their dynamic behaviour under rotating conditions when using BTT measurements. The process steps are described in detail, including the FE modelling and analysis of the blades and the blade-disk assembly, and the measurements of the blade tip deflection and blade stress. Furthermore, the uncertainties associated with the FE modelling and the measurement processes are quantified. The results show that the FE model is valid considering the control of most uncertainties. The experimental validation of the FE-computed stress-to-tip deflection calibration factors in the present study provides the basis for the determination of the calibration factors under rotational conditions using a previously presented BTT data simulator, and for the design of corresponding rotating experiments using BTT.Keywords: Blade tip timing, FEM validation, Vibration measurements, Blade stresses

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DO - 10.1016/j.ymssp.2022.109257

M3 - Article

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SP - 109257

JO - Mechanical Systems and Signal Processing

JF - Mechanical Systems and Signal Processing

ER -

Experimental validation of FEM-computed stress to tip deflection ratios of aero-engine compressor blade vibration modes and quantification of associated uncertainties

Abstract

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Batista (Blade Tip Timing System Validator) - Clean Sky 2 - 862034

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