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 af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Konferenceartikel › Forskning › peer review

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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.

Originalsprog	Engelsk
Tidsskrift	Procedia Engineering
Vol/bind	199
Sider (fra-til)	2262-2267
Antal sider	6
ISSN	1877-7058
DOI	https://doi.org/10.1016/j.proeng.2017.09.234
Status	Udgivet - 12 sep. 2017
Begivenhed	X International Conference on Structural Dynamics, EURODYN 2017 - Varighed: 10 sep. 2017 → …

Konference

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

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10.1016/j.proeng.2017.09.234Licens: CC BY-NC-ND

1-s2.0-S1877705817336858-mainForlagets udgivne version, 502 KBLicens: CC BY-NC-ND

Citationsformater

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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",

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

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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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