Operational modal analysis based prediction of actual stress in an offshore structural model

Marius Glindtvad Tarpø; Bruna Silva Nabuco; Anders Skafte; Julie Carøe Kristoffersen; Jonas Vestermark; Sandro Diord Rescinho Amador; Rune Brincker

doi:10.1016/j.proeng.2017.09.234

Operational modal analysis based prediction of actual stress in an offshore structural model

Marius Glindtvad Tarpø^*, Bruna Silva Nabuco, Anders Skafte, Julie Carøe Kristoffersen, Jonas Vestermark, Sandro Diord Rescinho Amador, Rune Brincker

^*Corresponding author for this work

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Abstract

In this paper the accuracy of predicting stresses directly from the operational responses is investigated. The basic approach to the stress prediction is to perform an operational modal analysis (OMA) and then applying a modal filtering to the operating response, so that the modal coordinates of all significant modes are known. Next, the experimental mode shapes are expanded using a finite element (FE) model together with the local correspondence principle to estimate the displacements in all degrees of freedom of the FE model, and strain is predicted using the strain mode shapes. The accuracy of the approach is assessed by comparing the predicted and measured strains.

Original language	English
Journal	Procedia Engineering
Volume	199
Pages (from-to)	2262-2267
Number of pages	6
ISSN	1877-7058
DOIs	https://doi.org/10.1016/j.proeng.2017.09.234
Publication status	Published - 12 Sept 2017
Event	X International Conference on Structural Dynamics, EURODYN 2017 - Duration: 10 Sept 2017 → …

Conference

Conference	X International Conference on Structural Dynamics, EURODYN 2017
Period	10/09/2017 → …

Keywords

Modal Based Fatigue Estimation
Modal Expansion
Monitoring
Operational Modal Analysis

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1-s2.0-S1877705817336858-mainFinal published version, 502 KBLicence: CC BY-NC-ND

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@inproceedings{1f4810525f304ee8b15d822a25c07698,

title = "Operational modal analysis based prediction of actual stress in an offshore structural model",

abstract = "In this paper the accuracy of predicting stresses directly from the operational responses is investigated. The basic approach to the stress prediction is to perform an operational modal analysis (OMA) and then applying a modal filtering to the operating response, so that the modal coordinates of all significant modes are known. Next, the experimental mode shapes are expanded using a finite element (FE) model together with the local correspondence principle to estimate the displacements in all degrees of freedom of the FE model, and strain is predicted using the strain mode shapes. The accuracy of the approach is assessed by comparing the predicted and measured strains.",

keywords = "Modal Based Fatigue Estimation, Modal Expansion, Monitoring, Operational Modal Analysis",

author = "Tarp{\o}, {Marius Glindtvad} and {Silva Nabuco}, Bruna and Anders Skafte and Kristoffersen, {Julie Car{\o}e} and Jonas Vestermark and {Diord Rescinho Amador}, Sandro and Rune Brincker",

year = "2017",

month = sep,

day = "12",

doi = "10.1016/j.proeng.2017.09.234",

language = "English",

volume = "199",

pages = "2262--2267",

journal = "Procedia Engineering",

issn = "1877-7058",

publisher = "Elsevier BV",

note = "X International Conference on Structural Dynamics, EURODYN 2017 ; Conference date: 10-09-2017",

}

Operational modal analysis based prediction of actual stress in an offshore structural model. / Tarpø, Marius Glindtvad; Silva Nabuco, Bruna; Skafte, Anders et al.
In: Procedia Engineering, Vol. 199, 12.09.2017, p. 2262-2267.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Conference article › Research › peer-review

TY - GEN

T1 - Operational modal analysis based prediction of actual stress in an offshore structural model

AU - Tarpø, Marius Glindtvad

AU - Silva Nabuco, Bruna

AU - Skafte, Anders

AU - Kristoffersen, Julie Carøe

AU - Vestermark, Jonas

AU - Diord Rescinho Amador, Sandro

AU - Brincker, Rune

PY - 2017/9/12

Y1 - 2017/9/12

N2 - In this paper the accuracy of predicting stresses directly from the operational responses is investigated. The basic approach to the stress prediction is to perform an operational modal analysis (OMA) and then applying a modal filtering to the operating response, so that the modal coordinates of all significant modes are known. Next, the experimental mode shapes are expanded using a finite element (FE) model together with the local correspondence principle to estimate the displacements in all degrees of freedom of the FE model, and strain is predicted using the strain mode shapes. The accuracy of the approach is assessed by comparing the predicted and measured strains.

AB - In this paper the accuracy of predicting stresses directly from the operational responses is investigated. The basic approach to the stress prediction is to perform an operational modal analysis (OMA) and then applying a modal filtering to the operating response, so that the modal coordinates of all significant modes are known. Next, the experimental mode shapes are expanded using a finite element (FE) model together with the local correspondence principle to estimate the displacements in all degrees of freedom of the FE model, and strain is predicted using the strain mode shapes. The accuracy of the approach is assessed by comparing the predicted and measured strains.

KW - Modal Based Fatigue Estimation

KW - Modal Expansion

KW - Monitoring

KW - Operational Modal Analysis

U2 - 10.1016/j.proeng.2017.09.234

DO - 10.1016/j.proeng.2017.09.234

M3 - Conference article

SN - 1877-7058

VL - 199

SP - 2262

EP - 2267

JO - Procedia Engineering

JF - Procedia Engineering

T2 - X International Conference on Structural Dynamics, EURODYN 2017

Y2 - 10 September 2017

ER -

Operational modal analysis based prediction of actual stress in an offshore structural model

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