Finite-Element Modelling of an Experimental Mistuned Bladed Disk and Experimental Validation

Cazenove, Jean de; Cogan, Scott; Mbaye, Magatte

doi:10.1115/gt2013-95985

Cited by 5 publications

(4 citation statements)

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“…The experimental characterization of bladed disks (or blisks) dynamics is a critical task in turbomachinery for avoiding potential resonances and harsh startup and shutdown [1]. Bladed disks are usually characterized by many vibration modes which need to be recognized and investigated both with Finite Element (FE) analysis and through a dedicated experimental analysis [2]. These modes can be critically excited by different engine orders which induce resonances [3].…”

Section: Introductionmentioning

confidence: 99%

Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes

2021

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Vibration measurements of turbomachinery components are of utmost importance to characterize the dynamic behavior of rotating machines, thus preventing undesired operating conditions. Local techniques such as strain gauges or laser Doppler vibrometers are usually adopted to collect vibration data. However, these approaches provide single-point and generally 1D measurements. The present work proposes an optical technique, which uses two low-speed cameras, a multimedia projector, and three-dimensional digital image correlation (3D-DIC) to provide full-field measurements of a bladed disk undergoing harmonic response analysis (i.e., pure sinusoidal excitation) in the kHz range. The proposed approach exploits a downsampling strategy to overcome the limitations introduced by low-speed cameras. The developed experimental setup was used to measure the response of a bladed disk subjected to an excitation frequency above 6 kHz, providing a deep insight in the deformed shapes, in terms of amplitude and phase distributions, which could not be feasible with single-point sensors. Results demonstrated the system’s effectiveness in measuring amplitudes of few microns, also evidencing blade mistuning effects. A deeper insight into the deformed shape analysis was provided by considering the phase maps on the entire blisk geometry, and phase variation lines were observed on the blades for high excitation frequency.

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Section: Introductionmentioning

confidence: 99%

Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes

2021

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“…This kind of test is not straightforward for an IBR/blisk, and the literature reflects different options. [6][7][8][9] Although model updating techniques have been applied to represent the global behaviour of rotor systems, 10,11 this article takes a step forward and applies these techniques to represent the mistuning phenomena in rotor components. The idea is to perform a standard modal test that characterizes dynamically the whole structure.…”

Section: Introductionmentioning

confidence: 99%

“…The experimental results will be used to identify the global mode shapes and these mode shapes are used for updating a finite element model (FEM), which initially assumes perfect cyclic symmetry. Afterwards, the updating model will be used to calculate the individual frequencies that other approaches intend to extract directly from a more complex test (adding damping material 6 or masses 7,8 to the non-tested blades). Finally, these individual frequencies can be used as inputs to any of the ROMs available in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Application of model updating techniques to turbomachinery rotor components

Alonso

Albizuri

Esparza³

2019

Advances in Mechanical Engineering

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Model updating techniques are commonly used to improve simulation accuracy. Experimental data of component testing under laboratory conditions are normally used to improve analytical predictions of that component under operational conditions. In this study, we have applied these techniques to the dynamics of turbomachinery components. Dynamics of turbomachinery rotor components are normally analysed assuming perfect cyclic symmetry of the basis sector (one blade and its corresponding part of the disc) and this sector is mechanically the same in every angular position. However, the manufacturing process introduces small differences among sectors (mistuning) and changes the global dynamic behaviour. There are several analytical approaches in the literature to model these differences with reduced order models of the whole rotor that include the frequency differences among sectors, which can be obtained experimentally in a component test. Several approaches in the literature use experimental results from a test with a particular set-up in order to obtain the inputs for the models. The approach proposed in this article is just to perform a standard modal test that generates the input for model updating and to extract from the updated model the required input for representing the mistuning phenomena in turbomachinery rotor components.

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Predictive dynamic modeling and analysis of blisks through digital representations constructed upon precise geometry measurements

Zhou,

Xie,

Battiato

et al. 2024

Mechanical Systems and Signal Processing

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Finite-Element Modelling of an Experimental Mistuned Bladed Disk and Experimental Validation

Cited by 5 publications

References 0 publications

Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes

Stereo-DIC Measurements of a Vibrating Bladed Disk: In-Depth Analysis of Full-Field Deformed Shapes

Application of model updating techniques to turbomachinery rotor components

Predictive dynamic modeling and analysis of blisks through digital representations constructed upon precise geometry measurements

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