Response-Based Estimation of Sea State Parameters
Reliable estimation of the on-site sea state parameters is essential to decision support systems for safe navigation of ships. The sea state parameters can be estimated by Bayesian Modelling which uses complex-valued frequency response functions (FRF) to estimate the wave spectrum on the basis of me...
Main Author: | |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2007
|
Subjects: | |
Online Access: | https://orbit.dtu.dk/en/publications/5478c37b-957a-41b3-90e5-ce48181fb53d |
id |
ftdtupubl:oai:pure.atira.dk:publications/5478c37b-957a-41b3-90e5-ce48181fb53d |
---|---|
record_format |
openpolar |
spelling |
ftdtupubl:oai:pure.atira.dk:publications/5478c37b-957a-41b3-90e5-ce48181fb53d 2024-09-15T17:50:12+00:00 Response-Based Estimation of Sea State Parameters Nielsen, Ulrik Dam 2007 https://orbit.dtu.dk/en/publications/5478c37b-957a-41b3-90e5-ce48181fb53d eng eng https://orbit.dtu.dk/en/publications/5478c37b-957a-41b3-90e5-ce48181fb53d urn:ISBN:0-7918-3799-8 info:eu-repo/semantics/restrictedAccess Nielsen , U D 2007 , Response-Based Estimation of Sea State Parameters . in Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering . 26th International Conference on Offshore Mechanics and Arctic Engineering , San Diego, CA , United States , 10/06/2007 . contributionToPeriodical 2007 ftdtupubl 2024-08-19T06:56:43Z Reliable estimation of the on-site sea state parameters is essential to decision support systems for safe navigation of ships. The sea state parameters can be estimated by Bayesian Modelling which uses complex-valued frequency response functions (FRF) to estimate the wave spectrum on the basis of measured ship responses. It is therefore interesting to investigate how the filtering aspect, introduced by FRF, affects the final outcome of the estimation procedures. The paper contains a study based on numerical generated time series, and the study shows that filtering has an influence on the estimations, since high frequency components of the wave excitations are not estimated as accurately as lower frequency components. Moreover, the paper investigates how the final outcome of the Bayesian Modelling is influenced by the accuracy of the FRF. Thus, full-scale data is analysed by use of FRF calculated by a 3-D time domain code and by closed-form (analytical) expressions, respectively. Based on comparisons with wave radar measurements and satellite measurements it is seen that the wave estimations based on closedform expressions exhibit a reasonable energy content, but the distribution of energy appears to be incorrect. Article in Journal/Newspaper Arctic Technical University of Denmark: DTU Orbit |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Reliable estimation of the on-site sea state parameters is essential to decision support systems for safe navigation of ships. The sea state parameters can be estimated by Bayesian Modelling which uses complex-valued frequency response functions (FRF) to estimate the wave spectrum on the basis of measured ship responses. It is therefore interesting to investigate how the filtering aspect, introduced by FRF, affects the final outcome of the estimation procedures. The paper contains a study based on numerical generated time series, and the study shows that filtering has an influence on the estimations, since high frequency components of the wave excitations are not estimated as accurately as lower frequency components. Moreover, the paper investigates how the final outcome of the Bayesian Modelling is influenced by the accuracy of the FRF. Thus, full-scale data is analysed by use of FRF calculated by a 3-D time domain code and by closed-form (analytical) expressions, respectively. Based on comparisons with wave radar measurements and satellite measurements it is seen that the wave estimations based on closedform expressions exhibit a reasonable energy content, but the distribution of energy appears to be incorrect. |
format |
Article in Journal/Newspaper |
author |
Nielsen, Ulrik Dam |
spellingShingle |
Nielsen, Ulrik Dam Response-Based Estimation of Sea State Parameters |
author_facet |
Nielsen, Ulrik Dam |
author_sort |
Nielsen, Ulrik Dam |
title |
Response-Based Estimation of Sea State Parameters |
title_short |
Response-Based Estimation of Sea State Parameters |
title_full |
Response-Based Estimation of Sea State Parameters |
title_fullStr |
Response-Based Estimation of Sea State Parameters |
title_full_unstemmed |
Response-Based Estimation of Sea State Parameters |
title_sort |
response-based estimation of sea state parameters |
publishDate |
2007 |
url |
https://orbit.dtu.dk/en/publications/5478c37b-957a-41b3-90e5-ce48181fb53d |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Nielsen , U D 2007 , Response-Based Estimation of Sea State Parameters . in Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering . 26th International Conference on Offshore Mechanics and Arctic Engineering , San Diego, CA , United States , 10/06/2007 . |
op_relation |
https://orbit.dtu.dk/en/publications/5478c37b-957a-41b3-90e5-ce48181fb53d urn:ISBN:0-7918-3799-8 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1810292038161137664 |