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Correlation of finite element models of multi-physics systems

Correlation of finite element models of multi-physics systems
Correlation of finite element models of multi-physics systems
The modal assurance criterion (MAC) and normalized cross-orthogonality (NCO) check are widely used to assess the correlation between the experimentally determined modes and the finite element model (FEM) predictions of mechanical systems. Here, their effectiveness in the correlation of FEM of two types of multi-physics systems, namely, viscoelastic damped systems and a shunted piezoelectric system are investigated using the dynamic characteristics obtained from a nominal FEM, that are considered as the ‘true’ or experimental characteristics and those obtained from the inaccurate FEMs. The usefulness of the MAC and NCO check in the prediction of the overall loss factor of the viscoelastic damped system, which is an important design tool for such systems, is assessed and it is observed that these correlation methods fail to properly predict the damping characteristics, along with the responses under base excitation. Hence, base force assurance criterion (BFAC) is applied by comparing the ‘true’ dynamic force at the base and inaccurate FEM predicted force such that the criterion can indicate the possible error in the acceleration and loss factor. The effect of temperature as an uncertainty on the MAC and NCO check is also studied using two viscoelastic systems. The usefulness of MAC for the correlation of a second multi-physics FEM that consists of a shunted piezoelectric damped system is also analyzed under harmonic excitation. It has been observed that MAC has limited use in the correlation and hence, a new correlation method – current assurance criterion – based on the electric current is introduced and it is demonstrated that this criterion correlates the dynamic characteristics of the piezoelectric system better than the MAC.

0022-460X
4051-4070
Sairajan, Kolasseri Kuttapan
1fbd81ff-85b5-4a45-a63a-b3e1feab968b
Aglietti, Guglielmo S.
e44d0dd4-0f71-4399-93d2-b802365cfb9e
Walker, S.J.I.
f28a342f-9755-48fd-94ea-09e44ac4dbf5
Sairajan, Kolasseri Kuttapan
1fbd81ff-85b5-4a45-a63a-b3e1feab968b
Aglietti, Guglielmo S.
e44d0dd4-0f71-4399-93d2-b802365cfb9e
Walker, S.J.I.
f28a342f-9755-48fd-94ea-09e44ac4dbf5

Sairajan, Kolasseri Kuttapan, Aglietti, Guglielmo S. and Walker, S.J.I. (2014) Correlation of finite element models of multi-physics systems. Journal of Sound and Vibration, 333 (117), 4051-4070. (doi:10.1016/j.jsv.2014.04.010).

Record type: Article

Abstract

The modal assurance criterion (MAC) and normalized cross-orthogonality (NCO) check are widely used to assess the correlation between the experimentally determined modes and the finite element model (FEM) predictions of mechanical systems. Here, their effectiveness in the correlation of FEM of two types of multi-physics systems, namely, viscoelastic damped systems and a shunted piezoelectric system are investigated using the dynamic characteristics obtained from a nominal FEM, that are considered as the ‘true’ or experimental characteristics and those obtained from the inaccurate FEMs. The usefulness of the MAC and NCO check in the prediction of the overall loss factor of the viscoelastic damped system, which is an important design tool for such systems, is assessed and it is observed that these correlation methods fail to properly predict the damping characteristics, along with the responses under base excitation. Hence, base force assurance criterion (BFAC) is applied by comparing the ‘true’ dynamic force at the base and inaccurate FEM predicted force such that the criterion can indicate the possible error in the acceleration and loss factor. The effect of temperature as an uncertainty on the MAC and NCO check is also studied using two viscoelastic systems. The usefulness of MAC for the correlation of a second multi-physics FEM that consists of a shunted piezoelectric damped system is also analyzed under harmonic excitation. It has been observed that MAC has limited use in the correlation and hence, a new correlation method – current assurance criterion – based on the electric current is introduced and it is demonstrated that this criterion correlates the dynamic characteristics of the piezoelectric system better than the MAC.

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e-pub ahead of print date: 9 May 2014
Published date: August 2014
Organisations: Astronautics Group

Identifiers

Local EPrints ID: 365060
URI: http://eprints.soton.ac.uk/id/eprint/365060
ISSN: 0022-460X
PURE UUID: 5409cc77-1435-422e-ad11-3596a1c63140

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Date deposited: 20 May 2014 11:29
Last modified: 14 Mar 2024 16:45

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Contributors

Author: Kolasseri Kuttapan Sairajan
Author: Guglielmo S. Aglietti
Author: S.J.I. Walker

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