Modal Analysis of an Offshore Platform using Two Different ARMA Approaches

Rune Brincker; P. Andersen; M. E. Martinez; F. Tallavó

Modal Analysis of an Offshore Platform using Two Different ARMA Approaches

Rune Brincker
, P. Andersen
, M. E. Martinez
, F. Tallavó

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

Abstract

In the present investigation, multi-channel response measurements on an offshore platform subjected to wave loads is analysed using Auto Regressive Moving Average (ARMA) models. Two different estimation schemes are used and the results are compared. In the first approach, a scalar ARMA model is used to estimate the poles (eigenfrequencies and damping ratios), and then the mode shapes are found by fitting an analytical form to the empirical estimates of the covariance functions using the estimated poles. In the second approach, a full vector model is used, and the pole and mode shapes are estimated in one step by solving an eigenvalue problem. Both of the models assume 14 modes, some of them are considered non-physical. Results for the 8 most significant modes in the estimations are compared.

Original language	English
Title of host publication	Proceedings of the 14th International Modal Analysis Conference, Dearborn, Michigan, USA, February 12-15, 1996
Publisher	Society for Experimental Mechanics
Publication date	1996
Pages	1197-1204
Publication status	Published - 1996
Event	The International Modal Analysis Conference - Dearborn, Michigan, United States Duration: 12 Feb 1996 → 15 Feb 1996

Conference

Conference	The International Modal Analysis Conference
Country/Territory	United States
City	Dearborn, Michigan
Period	12/02/1996 → 15/02/1996

Keywords

Multi-Channel Response Measurements
Offshore Platform
Wave Loads
Auto-Regressive Moving Average Models
ARMA
Models
Modes

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@inproceedings{f08ab960809411db8b97000ea68e967b,

title = "Modal Analysis of an Offshore Platform using Two Different ARMA Approaches",

abstract = "In the present investigation, multi-channel response measurements on an offshore platform subjected to wave loads is analysed using Auto Regressive Moving Average (ARMA) models. Two different estimation schemes are used and the results are compared. In the first approach, a scalar ARMA model is used to estimate the poles (eigenfrequencies and damping ratios), and then the mode shapes are found by fitting an analytical form to the empirical estimates of the covariance functions using the estimated poles. In the second approach, a full vector model is used, and the pole and mode shapes are estimated in one step by solving an eigenvalue problem. Both of the models assume 14 modes, some of them are considered non-physical. Results for the 8 most significant modes in the estimations are compared.",

keywords = "Multi-Channel Response Measurements, Offshore Platform, Auto-Regressive Moving Average Models, ARMA, Models, Modes, Multi-Channel Response Measurements, Offshore Platform, Wave Loads, Auto-Regressive Moving Average Models, ARMA, Models, Modes",

author = "Rune Brincker and P. Andersen and Martinez, \{M. E.\} and F. Tallav{\'o}",

year = "1996",

language = "English",

pages = "1197--1204",

booktitle = "Proceedings of the 14th International Modal Analysis Conference, Dearborn, Michigan, USA, February 12-15, 1996",

publisher = "Society for Experimental Mechanics",

address = "United States",

note = "The International Modal Analysis Conference ; Conference date: 12-02-1996 Through 15-02-1996",

}

Brincker, R, Andersen, P, Martinez, ME & Tallavó, F 1996, Modal Analysis of an Offshore Platform using Two Different ARMA Approaches. in Proceedings of the 14th International Modal Analysis Conference, Dearborn, Michigan, USA, February 12-15, 1996. Society for Experimental Mechanics, pp. 1197-1204, The International Modal Analysis Conference, Dearborn, Michigan, United States, 12/02/1996.

Modal Analysis of an Offshore Platform using Two Different ARMA Approaches. / Brincker, Rune; Andersen, P.; Martinez, M. E. et al.
Proceedings of the 14th International Modal Analysis Conference, Dearborn, Michigan, USA, February 12-15, 1996. Society for Experimental Mechanics, 1996. p. 1197-1204.

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

TY - GEN

T1 - Modal Analysis of an Offshore Platform using Two Different ARMA Approaches

AU - Brincker, Rune

AU - Andersen, P.

AU - Martinez, M. E.

AU - Tallavó, F.

PY - 1996

Y1 - 1996

N2 - In the present investigation, multi-channel response measurements on an offshore platform subjected to wave loads is analysed using Auto Regressive Moving Average (ARMA) models. Two different estimation schemes are used and the results are compared. In the first approach, a scalar ARMA model is used to estimate the poles (eigenfrequencies and damping ratios), and then the mode shapes are found by fitting an analytical form to the empirical estimates of the covariance functions using the estimated poles. In the second approach, a full vector model is used, and the pole and mode shapes are estimated in one step by solving an eigenvalue problem. Both of the models assume 14 modes, some of them are considered non-physical. Results for the 8 most significant modes in the estimations are compared.

AB - In the present investigation, multi-channel response measurements on an offshore platform subjected to wave loads is analysed using Auto Regressive Moving Average (ARMA) models. Two different estimation schemes are used and the results are compared. In the first approach, a scalar ARMA model is used to estimate the poles (eigenfrequencies and damping ratios), and then the mode shapes are found by fitting an analytical form to the empirical estimates of the covariance functions using the estimated poles. In the second approach, a full vector model is used, and the pole and mode shapes are estimated in one step by solving an eigenvalue problem. Both of the models assume 14 modes, some of them are considered non-physical. Results for the 8 most significant modes in the estimations are compared.

KW - Multi-Channel Response Measurements

KW - Offshore Platform

KW - Auto-Regressive Moving Average Models

KW - ARMA

KW - Models

KW - Modes

KW - Multi-Channel Response Measurements

KW - Offshore Platform

KW - Wave Loads

KW - Auto-Regressive Moving Average Models

KW - ARMA

KW - Models

KW - Modes

M3 - Article in proceeding

SP - 1197

EP - 1204

BT - Proceedings of the 14th International Modal Analysis Conference, Dearborn, Michigan, USA, February 12-15, 1996

PB - Society for Experimental Mechanics

T2 - The International Modal Analysis Conference

Y2 - 12 February 1996 through 15 February 1996

ER -

Modal Analysis of an Offshore Platform using Two Different ARMA Approaches

Abstract

Conference

Keywords

AUB Link

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