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新JIP:海上间歇无人值守驾驶台
Posted: February 2, 2024
JOIN THE ALERT PROJECT: SAFELY LEAVING THE NAVIGATION BRIDGE UNATTENDED FOR PERIODS OF TIME WHILE AT SEA Within the new JIP initiative Alert we will determine the conditions for when it is safe to periodically leave navigation spaces unattended and at the same time examine whether that improves the safety, working and living situation for the crew […]
Events
Publications
2017
Frans Hendrik Lafeber, Thomas Lloyd; Bosschers, Johan
Inter.Noise Hongkong 27-30 August, no. ID682, 2017.
@conference{Lafeber2017b,
title = {Validation of underwater radiated noise predictions for a merchant vessel using full-scale measurements},
author = {Frans Hendrik Lafeber, Thomas Lloyd and Johan Bosschers},
url = {http://www.marin.nl/web/Publications/Publication-items/Validation-of-underwater-radiated-noise-predictions-for-a-merchant-vessel-using-fullscale-measurements.htm},
year = {2017},
date = {2017-08-27},
booktitle = {Inter.Noise Hongkong 27-30 August},
number = {ID682},
abstract = {Underwater radiated noise (URN) was previously primarily of interest in connection with the signature of naval vessels. Recently it has become increasingly relevant for other vessel types, such as cruise and merchant ships, due to a growing concern that marine life is affected by rising anthropogenic noise levels in the oceans. Shipping is a main contributor to those noise levels, with the cavitating propeller being the dominant noise source. Marine mammals and fish use sound to communicate and to sense their environment and this requires low background noise levels. The URN of a cavitating propeller can be predicted before the ship is built by means of computations and model-scale tests. High-quality validation material is needed for the validation of computational models and model test procedures, which include the scaling of the noise levels. Within the CRS framework (Cooperative Research Ships, http://www.crships.org/) a full-scale measurement campaign was carried out on a single-screw cargo vessel by DNV-GL, DAMEN and MARIN. Model tests for several conditions have been carried out in MARIN’s Depressurized Wave Basin. During these tests, URN was measured and cavitation patterns were observed using high-speed video cameras. Within the CRS a semi-empirical model has also been developed, which predicts the broadband pressure fluctuations and URN of cavitating tip vortices on marine propellers. This paper discusses a validation study of the computational and model test procedures for determining URN due to cavitating propellers, using the full-scale data of the aforementioned ship. Some aspects of the analysis and scaling procedures are discussed. Results are shown for three pitch settings. The agreement between the results of the various methods is very good; mostly within 3 dB. The change in noise levels between the three tested conditions is well captured.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Underwater radiated noise (URN) was previously primarily of interest in connection with the signature of naval vessels. Recently it has become increasingly relevant for other vessel types, such as cruise and merchant ships, due to a growing concern that marine life is affected by rising anthropogenic noise levels in the oceans. Shipping is a main contributor to those noise levels, with the cavitating propeller being the dominant noise source. Marine mammals and fish use sound to communicate and to sense their environment and this requires low background noise levels. The URN of a cavitating propeller can be predicted before the ship is built by means of computations and model-scale tests. High-quality validation material is needed for the validation of computational models and model test procedures, which include the scaling of the noise levels. Within the CRS framework (Cooperative Research Ships, http://www.crships.org/) a full-scale measurement campaign was carried out on a single-screw cargo vessel by DNV-GL, DAMEN and MARIN. Model tests for several conditions have been carried out in MARIN’s Depressurized Wave Basin. During these tests, URN was measured and cavitation patterns were observed using high-speed video cameras. Within the CRS a semi-empirical model has also been developed, which predicts the broadband pressure fluctuations and URN of cavitating tip vortices on marine propellers. This paper discusses a validation study of the computational and model test procedures for determining URN due to cavitating propellers, using the full-scale data of the aforementioned ship. Some aspects of the analysis and scaling procedures are discussed. Results are shown for three pitch settings. The agreement between the results of the various methods is very good; mostly within 3 dB. The change in noise levels between the three tested conditions is well captured.
Réne Lindeboom Jule Scharnke, Bulent Duz
Wave-in-Deck Impact Loads in Relation with Wave Kinematics Conference
OMAE ASME 36th International Conference on Ocean, Offshore and Arctic Engineering, Trondheim, Norway, 2017, 2017.
@conference{Scharnke2017,
title = {Wave-in-Deck Impact Loads in Relation with Wave Kinematics},
author = {Jule Scharnke, Réne Lindeboom, Bulent Duz},
url = {http://www.marin.nl/web/Publications/Publication-items/WaveinDeck-Impact-Loads-in-Relation-with-Wave-Kinematics.htm},
year = {2017},
date = {2017-06-25},
booktitle = {OMAE ASME 36th International Conference on Ocean, Offshore and Arctic Engineering, Trondheim, Norway, 2017},
pages = {OMAE61406},
abstract = {Breaking waves have been studied for many decades and are still of interest as these waves contribute significantly to the dynamics and loading of offshore structures. In current MARIN research this awareness has led to the setup of an experiment to determine the kinematics of breaking waves using Particle Image Velocimetry (PIV). The purpose of the measurement campaign is to determine the evolution of the kinematics of breaking focussed waves. In addition to the PIV measurements in waves, small scale wave-in-deck impact load measurements on a fixed deck box were carried out in the same wave conditions. To investigate the link between wave kinematics and wave-in-deck impact loads, simplified loading models for estimating horizontal deck impact loads were applied and compared to the measured impact loads. In this paper, the comparison of the model test data to estimated loads is presented.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Breaking waves have been studied for many decades and are still of interest as these waves contribute significantly to the dynamics and loading of offshore structures. In current MARIN research this awareness has led to the setup of an experiment to determine the kinematics of breaking waves using Particle Image Velocimetry (PIV). The purpose of the measurement campaign is to determine the evolution of the kinematics of breaking focussed waves. In addition to the PIV measurements in waves, small scale wave-in-deck impact load measurements on a fixed deck box were carried out in the same wave conditions. To investigate the link between wave kinematics and wave-in-deck impact loads, simplified loading models for estimating horizontal deck impact loads were applied and compared to the measured impact loads. In this paper, the comparison of the model test data to estimated loads is presented.