A study on detection of nonlinearity using an aero-engine casing assembly

D. Di Maio, G. Ramakrishnan, S. Pascalis, Y. Rajasagaran, S. Ghambir

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)
6 Downloads (Pure)

Abstract

This research work presents a study on detection of nonlinearities in structural components and assemblies. The detection and location of nonlinearities should be considered an important step during the design stage when models need to be calibrated or updated. The correct validation of a Finite Element model enables reliable predictions of vibration responses. The validation process is nevertheless challenged for a number of reasons; one can be the presence of nonlinearities. There are many types of nonlinearities but the one looked at in here regards the discrete ones, where the localization is important in order to correctly perform the model validation. This research work will focus on how to locate sources of nonlinearities from an aero-engine casing equipped with mock-ups of pipe. The major objective of the paper is to present the Scanning Laser Doppler Vibrometer as useful measurement tool for locating sparse nonlinearities. The work aims to demonstrate how it should be possible to develop an indicator for detecting sources of nonlinearity from experiments. Eventually, this pilot study will lead to the development of a new metric for nonlinear modal testing based on scanning laser.

Original languageEnglish
Title of host publicationProceedings of ISMA 2016 - International Conference on Noise and Vibration Engineering and USD2016 - International Conference on Uncertainty in Structural Dynamics
EditorsPaul Sas, David Moens, Axel van de Walle
PublisherKatholieke Universiteit Leuven
Pages2625-2637
Number of pages13
ISBN (Electronic)9789073802940
Publication statusPublished - 2016
Externally publishedYes
Event27th International Conference on Noise and Vibration Engineering, ISMA 2016 and International Conference on Uncertainty in Structural Dynamics, USD 2016 - Leuven, Belgium
Duration: 19 Sep 201621 Sep 2016
Conference number: 27

Conference

Conference27th International Conference on Noise and Vibration Engineering, ISMA 2016 and International Conference on Uncertainty in Structural Dynamics, USD 2016
CountryBelgium
CityLeuven
Period19/09/1621/09/16

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