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

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

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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 - 2017
Event	X International Conference on Structural Dynamics - Sapienza University of Rome, Rome, Italy Duration: 10 Sept 2017 → 13 Sept 2017 Conference number: 10

Conference

Conference	X International Conference on Structural Dynamics
Number	10
Location	Sapienza University of Rome
Country/Territory	Italy
City	Rome
Period	10/09/2017 → 13/09/2017

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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.",

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

year = "2017",

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

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AU - Glindtvad Tarpø, Marius

AU - Silva Nabuco, Bruna

AU - Skafte, Anders

AU - Kristoffersen, Julie

AU - Vestermark, Jonas

AU - Diord Rescinho Amador, Sandro

AU - Brincker, Rune

N1 - Conference code: 10

PY - 2017

Y1 - 2017

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.

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

Y2 - 10 September 2017 through 13 September 2017

ER -

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

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