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Vibration analysis of uncertain spot-welded structures: experimental validation

Vibration analysis of uncertain spot-welded structures: experimental validation
Vibration analysis of uncertain spot-welded structures: experimental validation
There are inevitable uncertainties in the properties of spot-welded structures due to variability in the positions and diameters of the spot welds. This produces uncertainty in the vibrational response. Ideally the analyst would like to predict this variability, but this raises the challenges of efficient computation of response statistics as well as practical quantification of the input uncertainty. This paper presents an experimental validation of a numerically efficient approach to the prediction of vibration response statistics, which involves a multi-point constraint spot weld model, component mode synthesis with characteristic constraint modes and a low-rank update theory; the method is described elsewhere. Measurements were taken on 108 single-hat profiles, subsequently joined in pairs by four spot welds to produce 54 double-hat profiles. The spot weld diameters and positions were measured. These are then used as input data for the finite element model. Measurements of natural frequencies, frequency responses, loss factors and mode shapes were taken. Spot weld location and diameter and the natural frequencies are seen to be well modelled by normal distributions, with some modes being strongly correlated. Agreement between the numerical predictions and measured results for the natural frequency statistics and the frequency responses are seen to agree well
De Alba, R.O.
9e42a69e-9f6a-4806-b302-1ceb53421784
Ferguson, N.S.
8cb67e30-48e2-491c-9390-d444fa786ac8
Mace, B.R.
cfb883c3-2211-4f3a-b7f3-d5beb9baaefe
De Alba, R.O.
9e42a69e-9f6a-4806-b302-1ceb53421784
Ferguson, N.S.
8cb67e30-48e2-491c-9390-d444fa786ac8
Mace, B.R.
cfb883c3-2211-4f3a-b7f3-d5beb9baaefe

De Alba, R.O., Ferguson, N.S. and Mace, B.R. (2014) Vibration analysis of uncertain spot-welded structures: experimental validation. ICDVC-2014, the 4th International Conference on Dynamics, Vibration and Control, Grand Mercure Baolong Hotel, China. 23 Aug 2014 - 25 Aug 2015 .

Record type: Conference or Workshop Item (Paper)

Abstract

There are inevitable uncertainties in the properties of spot-welded structures due to variability in the positions and diameters of the spot welds. This produces uncertainty in the vibrational response. Ideally the analyst would like to predict this variability, but this raises the challenges of efficient computation of response statistics as well as practical quantification of the input uncertainty. This paper presents an experimental validation of a numerically efficient approach to the prediction of vibration response statistics, which involves a multi-point constraint spot weld model, component mode synthesis with characteristic constraint modes and a low-rank update theory; the method is described elsewhere. Measurements were taken on 108 single-hat profiles, subsequently joined in pairs by four spot welds to produce 54 double-hat profiles. The spot weld diameters and positions were measured. These are then used as input data for the finite element model. Measurements of natural frequencies, frequency responses, loss factors and mode shapes were taken. Spot weld location and diameter and the natural frequencies are seen to be well modelled by normal distributions, with some modes being strongly correlated. Agreement between the numerical predictions and measured results for the natural frequency statistics and the frequency responses are seen to agree well

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Published date: 23 August 2014
Venue - Dates: ICDVC-2014, the 4th International Conference on Dynamics, Vibration and Control, Grand Mercure Baolong Hotel, China, 2014-08-23 - 2015-08-25
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 368302
URI: http://eprints.soton.ac.uk/id/eprint/368302
PURE UUID: d4a45e35-a6d9-402f-b149-38a8fc66400a
ORCID for N.S. Ferguson: ORCID iD orcid.org/0000-0001-5955-7477
ORCID for B.R. Mace: ORCID iD orcid.org/0000-0003-3312-4918

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Date deposited: 04 Sep 2014 08:31
Last modified: 15 Mar 2024 02:34

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Contributors

Author: R.O. De Alba
Author: N.S. Ferguson ORCID iD
Author: B.R. Mace ORCID iD

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