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Search Results (4)

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Keywords = floating shock platform

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10 pages, 459 KB  
Article
Single-Phase Earth-Fault Protection of Power Cable of a Salt-Producing Floating Platform
by Aleksandr Novozhilov, Zhanat Issabekov, Timofey Novozhilov, Bibigul Issabekova and Lyazzat Tyulyugenova
Energies 2025, 18(19), 5234; https://doi.org/10.3390/en18195234 - 2 Oct 2025
Viewed by 284
Abstract
In this paper, a method to improve the protection of a four-core power cable of a salt-producing floating platform equipped with an automatic breaker with an independent tripping mechanism is suggested. The use of this automatic breaker in combination with a suggested protection [...] Read more.
In this paper, a method to improve the protection of a four-core power cable of a salt-producing floating platform equipped with an automatic breaker with an independent tripping mechanism is suggested. The use of this automatic breaker in combination with a suggested protection device ensures reliable protection of not only the power cables of the platform against all faults but also the personnel of the platform and animals on the reservoir banks against electric shock in the event of a single-phase ground fault in reservoir water. This would be possible due to a voltage sensor made in the form of a metal ring on the power cable and a relay; one terminal of the relay winding is connected to the voltage sensor by a single-core control cable, and the other to the neutral of a power source on the platform. The typically open contacts of this relay are connected to an electric circuit which includes a power source and a coil for an independent tripping mechanism of the automatic breaker. This design ensures reliable operation of the suggested protection device in the event of a single-phase ground fault in the power cable of the platform when underwater cable insulation is damaged. Full article
(This article belongs to the Section F: Electrical Engineering)
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12 pages, 2784 KB  
Proceeding Paper
On the Exploration of the Influence of Seabed Reflected Waves on Naval Structures
by Jacopo Bardiani, Marco Giglio, Claudio Sbarufatti and Andrea Manes
Eng. Proc. 2025, 85(1), 7; https://doi.org/10.3390/engproc2025085007 - 13 Feb 2025
Cited by 5 | Viewed by 799
Abstract
The interaction between naval structures and underwater shock waves generated by explosions is critical in marine engineering. Numerical analysis is pivotal in investigating the effects of reflected waves from the free surface and the seabed on submerged or floating structures. This topic still [...] Read more.
The interaction between naval structures and underwater shock waves generated by explosions is critical in marine engineering. Numerical analysis is pivotal in investigating the effects of reflected waves from the free surface and the seabed on submerged or floating structures. This topic still needs to be explored in the marine engineering literature despite its significance. Understanding the complex dynamics of shock wave reflections is paramount for ensuring marine installations’ structural integrity and safety, including submarines, offshore platforms, and surface vessels. This paper aims to fill this gap by presenting a preliminary numerical study focused on analyzing the influence of reflected waves caused by the seabed on a simple ship-like structure, where the free-surface effects are negligible. A Coupled Eulerian–Lagrangian approach based on the suite MSC Dytran was used to investigate the interaction between shock waves and the seabed, considering a structure represented by an underwater cylinder and several seabed compositions. A deeper understanding of this phenomenon is crucial for enhancing the resilience and safety of marine installations, thereby mitigating potential risks and ensuring sustainable maritime operations. The simulations presented in this work represent the starting point for the creation of datasets to be used in Machine Learning applications. Full article
(This article belongs to the Proceedings of The 53rd Conference of the Italian Scientific Society of Mechanical Engineering Design)
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19 pages, 7372 KB  
Article
Experimental Study of the Load-Transfer Law and Shock Environment of a Pipe–Float System
by Miaoran Li, Jun Li, Wei Chen, Zhiyang Lei, Lijiang Zhou, Mengzhen Li, Chun Bao Li and Xiaobin Li
J. Mar. Sci. Eng. 2024, 12(4), 650; https://doi.org/10.3390/jmse12040650 - 12 Apr 2024
Cited by 3 | Viewed by 1684
Abstract
To study the load-transfer law and shock environment of a pipe–float system, an experimental model was designed, manufactured, and installed on a floating shock platform. Two underwater explosion cases were studied, focusing on vertical and horizontal shock cases. The experimental results show that [...] Read more.
To study the load-transfer law and shock environment of a pipe–float system, an experimental model was designed, manufactured, and installed on a floating shock platform. Two underwater explosion cases were studied, focusing on vertical and horizontal shock cases. The experimental results show that the structure of the system on the floating raft significantly influences the load acceleration transfer and the composition of the vertical and horizontal components. Furthermore, the flexible connector can effectively block the response behavior of the two ends of the pipe, and the peak acceleration difference between the two pipe ends is 98.9%. The vertical and horizontal components of the shock-wave load affect the stress concentration locations on the pipe. The main frequency in the shock environment at the connection point between the floating raft and the upper equipment shifts toward middle and low frequencies under the influence of the upper equipment, and it will be closer to the natural frequency of the upper equipment. Full article
(This article belongs to the Special Issue Anti-explosion, Anti-impact and Vibration Isolation Advanced Protection Design in Naval Architecture and Ocean Engineering)
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14 pages, 6946 KB  
Article
Research on the Shock Environment Characteristics of a Marine Diesel Engine Based on a Large Floating Shock Platform
by Yu Zhang, Jun Li, Chunhui Zhang, Wei Chen, Zhipeng Du and Xiaobin Li
J. Mar. Sci. Eng. 2023, 11(12), 2308; https://doi.org/10.3390/jmse11122308 - 6 Dec 2023
Cited by 1 | Viewed by 1839
Abstract
To conduct a precise shock assessment of marine diesel engines, a 200 t floating shock platform was utilized to simulate realistic testing conditions. The testing generated the acceleration time curve and the shock response spectrum for the diesel engine. According to the applicable [...] Read more.
To conduct a precise shock assessment of marine diesel engines, a 200 t floating shock platform was utilized to simulate realistic testing conditions. The testing generated the acceleration time curve and the shock response spectrum for the diesel engine. According to the applicable standards, the spectral velocity was chosen as the evaluation index, and an evaluation of the longitudinal, transverse, and vertical shock environment of the diesel engine was conducted. The shock factor interpolation method was corrected using the confidence interval based on normal distribution, and the interpolated confidence interval of the shock factor was determined. The findings reveal that shock waves were identified as the primary external force, and it was found that the influence of bubble pulsation can be disregarded when assessing a floating shock platform. This paper proposes the use of normal-distribution-based shock factor confidence intervals, which can accurately predict multidirectional shock factors and offer improved shock safety compared to the traditional method of unidirectional shock factor interpolation. The results and methods obtained in this study can provide valuable guidance and assistance for predicting the shock environment of large shipboard machinery on significant floating shock platforms. Full article
(This article belongs to the Special Issue Anti-explosion, Anti-impact and Vibration Isolation Advanced Protection Design in Naval Architecture and Ocean Engineering)
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