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Search Results (4)

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Keywords = simplified hull girder

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16 pages, 1813 KB  
Proceeding Paper
Scaling the Response of a Simplified Hull Girder Subjected to Underwater Explosions
by Giovanni Marchesi, Luca Lomazzi, Marco Giglio and Andrea Manes
Eng. Proc. 2025, 85(1), 19; https://doi.org/10.3390/engproc2025085019 - 19 Feb 2025
Cited by 1 | Viewed by 1329
Abstract
Underwater explosions (UNDEXs) represent a significant threat to marine vessels, motivating the analysis of their resulting dynamic response and damage. Conducting experimental investigations on full-scale ships, while being the most consistent strategy, is not always feasible due to obvious economic constraints. Consequently, researchers [...] Read more.
Underwater explosions (UNDEXs) represent a significant threat to marine vessels, motivating the analysis of their resulting dynamic response and damage. Conducting experimental investigations on full-scale ships, while being the most consistent strategy, is not always feasible due to obvious economic constraints. Consequently, researchers usually rely on scaled models designed to replicate real-world scenarios in laboratory environments. Despite the widespread use of this approach, the scaling laws between prototypes and models are not yet satisfactory due to the complexity of the UNDEX phenomena and the variability in boundary conditions. To address this aspect, the present study focuses on the scalability of a simplified vessel, termed a simplified hull girder (SHG). This study is conducted numerically and originates from a comparison with experiments available in the literature. This work has two objectives: firstly, it provides a practical approach to simulating the behaviour of complex architectures that undergo severe deformation due to blast loads, a critical challenge for state-of-the-art computational methods. Secondly, this work aims to assess the reliability of the scaling laws commonly used in UNDEX scenarios and to highlight the importance of strain-rate effects. 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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17 pages, 10616 KB  
Article
Numerical Study on the Sagging Damage of the Simplified Hull Girder Subjected to Underwater Explosion Bubble
by Yuxiang Gong, Wenpeng Zhang, Zhipeng Du and Yinghao Zhu
Appl. Sci. 2023, 13(4), 2318; https://doi.org/10.3390/app13042318 - 10 Feb 2023
Cited by 10 | Viewed by 3090
Abstract
The pulsation of the bubbles resulting from underwater explosions can lead to severe damage to the structure of the ship’s hull, and even to its sinking. To study the damage mechanism of a simplified hull girder (SHG) subjected to near-field underwater explosion bubble, [...] Read more.
The pulsation of the bubbles resulting from underwater explosions can lead to severe damage to the structure of the ship’s hull, and even to its sinking. To study the damage mechanism of a simplified hull girder (SHG) subjected to near-field underwater explosion bubble, the Coupled Eulerian–Lagrangian (CEL) method based on verifications of the calculation accuracy was used to simulate 11 SHG structures. The sagging bend mechanism of SHGs was analyzed from the perspective of plastic hinge lines. Moreover, the length formula of the potential bend zone was studied through the assumed plastic hinge lines. The influence of transverse bulkheads on bending mode and total longitudinal strength was investigated. The results show that SHGs’ sagging damage is composed of regular plastic hinge lines, mainly depending on side plates’ folding—W-shaped in this paper. When facing the near-field underwater explosion bubble, the distant transverse bulkheads influence the total longitudinal strength and do not always play a positive role. Full article
(This article belongs to the Special Issue Ship Structures: Design Loads and Reliability Assessment)
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25 pages, 7547 KB  
Article
Predictions of Ship Extreme Hydroelastic Load Responses in Harsh Irregular Waves and Hull Girder Ultimate Strength Assessment
by Jialong Jiao, Yong Jiang, Hao Zhang, Chengjun Li and Chaohe Chen
Appl. Sci. 2019, 9(2), 240; https://doi.org/10.3390/app9020240 - 10 Jan 2019
Cited by 19 | Viewed by 5441
Abstract
In this paper, the hydroelastic motion and load responses of a large flexible ship sailing in irregular seaways are predicted and the hull girder ultimate strength is subsequently evaluated. A three-dimensional time-domain nonlinear hydroelasticity theory is developed where the included nonlinearities are those [...] Read more.
In this paper, the hydroelastic motion and load responses of a large flexible ship sailing in irregular seaways are predicted and the hull girder ultimate strength is subsequently evaluated. A three-dimensional time-domain nonlinear hydroelasticity theory is developed where the included nonlinearities are those arising from incident wave force, hydrostatic restoring force and slamming loads. The hull girder structure is simplified as a slender Timoshenko beam and fully coupled with the hydrodynamic model in a time domain. Segmented model towing-tank tests are then conducted to validate the proposed hydroelasticity theory. In addition, short-term and long-term predictions of ship responses in irregular seaways are conducted with the help of the developed hydroelastic code in order to determine the extreme design loads. Finally, a simplified strength-check equation is proposed, which will provide significant reference and convenience for ship design and evaluation. The hull girder ultimate strength is assessed by both the improved Rule approach and direct calculation. Full article
(This article belongs to the Section Acoustics and Vibrations)
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17 pages, 1562 KB  
Article
A New Bias Error Prediction Model for High-Precision Transfer Alignment
by Yutong Zhang, Shuai Yang, Shiqiao Qin, Feng Hu and Wei Wu
Sensors 2018, 18(10), 3277; https://doi.org/10.3390/s18103277 - 29 Sep 2018
Cited by 6 | Viewed by 3105
Abstract
The purpose of this work was to study bias error in acceleration-based transfer alignment, which is probably caused by cross-correlation between the dynamic lever-arm and the linear motion of a ship. A new prediction model for the cross-correlation-caused error is proposed in this [...] Read more.
The purpose of this work was to study bias error in acceleration-based transfer alignment, which is probably caused by cross-correlation between the dynamic lever-arm and the linear motion of a ship. A new prediction model for the cross-correlation-caused error is proposed in this paper. We adopt the Bernoulli-Euler Beam as a simplified ship hull-girder model to verify the existence of the cross-correlation. Then, the mathematical mechanism and the prediction model of the bias error are deduced via the ordinary least squares theory. Three factors influence the bias error in the prediction model: the amplitude of the dynamic lever arm acceleration, the amplitude of the ship motion acceleration, and the cross-correlation between them. Simulation experiments are then conducted to test the influence of the factors. The results show that the mechanism analysis is reasonable, and the bias error prediction model is in agreement with the experimental results. Thus, the proposed prediction model has the potential to deduce the bias error in high-accuracy transfer alignment. Full article
(This article belongs to the Section Physical Sensors)
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