Zobrazeno 1 - 10 of 99 pro vyhledávání: '"Ulrik Dam Nielsen"'
1
Akademický článek
Validation and correction of auto-logged position measurements
Autor: Angelos Ikonomakis, Ulrik Dam Nielsen, Klaus Kähler Holst, Jesper Dietz, Roberto Galeazzi
Publikováno v: Communications in Transportation Research, Vol 2, Iss , Pp 100051- (2022)
Accurate position measurements are extremely valuable in the shipping industry for various reasons such as safety (collision avoidance), security (situational awareness), fuel-saving (weather identification), punctuality (route prediction), etc. Alth
Externí odkaz: https://doaj.org/article/2f798a1cb6a44e84b6aafc4dc72ff1bc
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2
Akademický článek
How Good Is the STW Sensor? An Account from a Larger Shipping Company
Autor: Angelos Ikonomakis, Ulrik Dam Nielsen, Klaus Kähler Holst, Jesper Dietz, Roberto Galeazzi
Publikováno v: Journal of Marine Science and Engineering, Vol 9, Iss 5, p 465 (2021)
This paper examines the statistical properties and the quality of the speed through water (STW) measurement based on data extracted from almost 200 container ships of Maersk Line’s fleet for 3 years of operation. The analysis uses high-frequency se
Externí odkaz: https://doaj.org/article/5e8e367760954887b66b8e99a6f36fa5
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3
Estimating speed-through-water by Dynamic Factor Models fusing metocean and propeller data
Autor: Angelos Ikonomakis, Klaus Kähler Holst, Ulrik Dam Nielsen
Publikováno v: Ikonomakis, A, Holst, K K & Nielsen, U D 2023, ' Estimating speed-through-water by Dynamic Factor Models fusing metocean and propeller data ', Ocean Engineering, vol. 279, 114523 . https://doi.org/10.1016/j.oceaneng.2023.114523
In vessel performance analysis, reliable information about speed-through-water (STW) is key for realistic modeling of the single ship’s fuel efficiency. It is paramount that STW measurements are reliable such that they can be adopted as input in fu
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a402e4c701b17b5b6e9a6493954ed27
https://orbit.dtu.dk/en/publications/aaaf91e9-000f-425e-803a-6660a7c2b5f9
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5
Assessment of added resistance estimates based on monitoring data from a fleet of container vessels
Autor: Malte Mittendorf, Ulrik Dam Nielsen, Harry B. Bingham, Jesper Dietz
Publikováno v: Mittendorf, M, Nielsen, U D, Bingham, H B & Dietz, J 2023, ' Assessment of added resistance estimates based on monitoring data from a fleet of container vessels ', Ocean Engineering, vol. 272, 113892 . https://doi.org/10.1016/j.oceaneng.2023.113892
A practical estimation methodology of the mean added resistance in irregular waves is shown, and the present paper provides statistical analyses of estimates for ships in actual conditions. The study merges telemetry data of more than 200 in-service
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da18b3763c384f834c452d444ba0c47c
https://doi.org/10.1016/j.oceaneng.2023.113892
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6
Estimation of autocorrelation function and spectrum density of wave-induced responses using prolate spheroidal wave functions
Autor: Ulrik Dam Nielsen, Jørgen Juncher Jensen, Tomoki Takami
Publikováno v: Takami, T, Nielsen, U D & Jensen, J J 2021, ' Estimation of autocorrelation function and spectrum density of wave-induced responses using prolate spheroidal wave functions ', Journal of Marine Science and Technology, vol. 26, pp. 722-791 . https://doi.org/10.1007/s00773-020-00768-9
Journal of Marine Science and Technology
Predicting the wave-induced response in the near-future is of importance to ensure safety of ships. To achieve this target, a possible method for deterministic and conditional prediction of future responses utilizing measured data from the most recen
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aed7da3f5845d81e749b599325622b84
https://doi.org/10.1007/s00773-020-00768-9
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7
Spatio-temporal variation in sea state parameters along virtual ship route paths
Autor: Ulrik Dam Nielsen
Publikováno v: Nielsen, U D 2022, ' Spatio-temporal variation in sea state parameters along virtual ship route paths ', Journal of Operational Oceanography, vol. 15, no. 3, pp. 169-186 . https://doi.org/10.1080/1755876X.2021.1872894
Journal of operational oceanography. Publisher: The Institute of Marine Engineering, Science & Technology
The article presents a study investigating the level of variation in sea state parameters encountered by sailing ships crossing the oceans. The sea state parameters have been obtained from a reanalysis, in this case the ERA5. The study is based on th
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09fceb24d79d6d9ec7f2e0b00883aa73
https://orbit.dtu.dk/en/publications/4dfbd2c6-1920-49ed-a801-15c9671a636b
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8
Assessment of Ships’ Speed-Power Relationship at Lower Sailing Speeds
Autor: Frederik Hammer Berthelsen, Ulrik Dam Nielsen
Publikováno v: Hammer Berthelsen, F & Nielsen, U D 2022, ' Assessment of Ships’ Speed-Power Relationship at Lower Sailing Speeds ', Paper presented at 7th Hull Performance and Insight Conference 2022, Tullamore, Ireland, 09/05/2022-11/05/2022 .
Technical University of Denmark Orbit
This study assesses the relationship between speed and power of ships, and is based on operational data derived from more than 50,000 noon reports retrieved from 88 tankers. The analysis is made with a data-driven model based on principles from naval
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::b16bc71a8e87b09fb63091d27b07af7e
https://orbit.dtu.dk/en/publications/1f81b43f-6b1f-4156-9c7d-d5c38ac66aa4
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9
Automatic sea state estimation with online trust measure based on ship response measurements
Autor: Astrid H. Brodtkorb, Ulrik Dam Nielsen
Publikováno v: Control Engineering Practice
Brodtkorb, A H & Nielsen, U D 2022, ' Automatic sea state estimation with online trust measure based on ship response measurements ', Control Engineering Practice, vol. 130, 105375 . https://doi.org/10.1016/j.conengprac.2022.105375
The ever-changing sea state constitutes an integral part of situational awareness for vessels at sea. In this paper, a computationally efficient sea state estimation algorithm is extended by (1) automatic gain and tolerance calculation, and (2) trust
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::350fb766389f1d34cbe6efed33851c6f
https://hdl.handle.net/11250/3057608
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10
Towards the uncertainty quantification of semi-empirical formulas applied to the added resistance of ships in waves of arbitrary heading
Autor: Malte Mittendorf, Harry Bingham, Ulrik Dam Nielsen, Shukui LIU
Publikováno v: Mittendorf, M, Nielsen, U D, Bingham, H B & Liu, S 2022, ' Towards the uncertainty quantification of semi-empirical formulas applied to the added resistance of ships in waves of arbitrary heading ', Ocean Engineering, vol. 251, 111040 . https://doi.org/10.1016/j.oceaneng.2022.111040
The present paper examines a semi-empirical framework for the estimation of added resistance in arbitrary wave heading under consideration of uncertainty quantification. In this respect, the calibration of the formula's parameter vector is conducted
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f9734bbf54643b9429c52a7bcac06028
https://orbit.dtu.dk/en/publications/0172dab3-3662-4265-b79e-d2418be51753
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