Theoretical Assessment of Light Structural Damage due to Ship Collision With Ice

1991 ◽  
Vol 113 (1) ◽  
pp. 61-66 ◽  
Author(s):  
A. Moshaiov ◽  
M. R. Steinhilber
Keyword(s):  
Structural Design ◽  
Structural Damage ◽  
Rate Sensitivity ◽  
Marine Transportation ◽  
Design And Optimization ◽  
Ice Loads ◽  
Ship Collision ◽  
Further Development ◽  
Theoretical Assessment ◽  
Major Consideration

A major consideration in the recent development of marine transportation for ice-infested waters is the strength required for ships’ hulls. Plasticity methods are currently used in conjunction with given design ice loads. In this paper, a new plasticity model is suggested. It is based on the assumption that the kinetic energy of the ice/ship collision is absorbed both by the ice and the structure. During the collision process, the ice/structure contact area varies due to ice crushing, which dissipates some of the energy. At the same time, the plating may deform plastically, absorbing the remaining energy. Other forms of energies and ice failures are not accounted for, allowing a conservative estimate of the damage. A parametric study is performed, revealing the significance of the energy absorbed by the ice in reducing the predicted permanent deflection of the plating. The new model is shown to be useful for ship structural design and optimization in addition to the evaluation of operating restrictions. Several recommendations for further development of the model are discussed, including the incorporation of strain rate sensitivity of the ice-crushing strength and the plating yield strength.

Numerical Simulation of Ship Collision and Validations With Experimental Results

2021 ◽  
Author(s):  
Xiangbiao Wang ◽  
Chun Bao Li ◽  
Ling Zhu
Keyword(s):  
Numerical Simulation ◽  
Model Test ◽  
Structural Damage ◽  
Added Mass ◽  
Ship Motion ◽  
Time Dependent ◽  
Structural Deformation ◽  
Structure Interaction ◽  
Ship Collision ◽  
Good Agreement

Abstract Ship collision accidents occur from time to time in recent years, and this would cause serious consequences such as casualties, environmental pollution, loss of cargo on board, damage to the ship and its equipment, etc. Therefore, it is of great significance to study the response of ship motion and the mechanism of structural damage during the collision. In this paper, model experiments and numerical simulation are used to study the ship-ship collision. Firstly, the Coupled Eulerian-Lagrangian (CEL) was used to simulate the fluid-structure interaction for predicting structural deformation and ship motion during the normal ship-ship collision. Meanwhile, a series of model tests were carried out to validate the numerical results. The validation presented that the CEL simulation was in good agreement with the model test. However, the CEL simulation could not present the characteristics the time-dependent added mass.

A Rubber Bag for Liquid Cargo to Improve Ship Collision Safety

2016 ◽  
Author(s):  
Jan M. Kubiczek ◽  
Boyuan Liang ◽  
Lars Molter ◽  
Sören Ehlers
Keyword(s):  
Structural Design ◽  
Large Scale ◽  
Material Model ◽  
Tensile Tests ◽  
Additional Increase ◽  
Safety Level ◽  
Oil Leakage ◽  
Collision Safety ◽  
Reaction Forces ◽  
Ship Collision

Collisions and grounding accidents of ships, but also the failure of the hull-integrity, can lead to oil leakage. Examples are the Rena in 2011, the Hebei Spirit in 2007 and the much known accident of the Prestige in 2002. Consequently research regarding the enhancement of the structural design to increase the safety-level of ships in case of accidents is important. In this paper the use of a rubber bag as a second barrier is presented as an alternative concept to prevent oil leakage in case of accidents. The influence of the rubber bag is investigated using the example of a ship collision. A simplified tanker side structure as well as a box shaped rubber bag are analyzed with the finite element method. The material model for the rubber bag is calibrated with tensile tests to obtain the required material parameters. The reaction forces and the associated penetration depth are analyzed. The comparison is done between the structure with and without the rubber bag. For the latter, the general behavior is compared with large-scale experimental results. Furthermore an additional increase of the survivability of the ship due to the rubber bag without changing the common structural design is discussed.

Development of a Hypersonic Aircraft Design Optimization Tool

2014 ◽  
Vol 553 ◽  
pp. 847-852 ◽  
Author(s):  
Benjamin J. Morrell ◽  
David J. Munk ◽  
Gareth A. Vio ◽  
Dries Verstraete
Keyword(s):  
Structural Design ◽  
Current Practice ◽  
Thermal Stresses ◽  
Aircraft Design ◽  
Material Strength ◽  
Aircraft Structure ◽  
Aerodynamic Loads ◽  
Design And Optimization ◽  
Hypersonic Aircraft ◽  
Strength And Stiffness

The design and optimization of hypersonic aircraft is severely impacted by the high temperatures encountered during flight as they can lead to high thermal stresses and a significant reduction in material strength and stiffness. This reduction in rigidity of the structure requires innovative structural concepts and a stronger focus on aeroelastic deformations in the early design and optimisation of the aircraft structure. This imposes the need for a closer coupling of the aerodynamic and structural design tools than is current practice. The paper presents the development of a multi-disciplinary, closely coupled optimisation suite for hypersonic aircraft. An overview of the setup and structure of the optimization suite is given and the integration between the Tranair solver, used to determine the aerodynamic loads and temperatures, and MSC/NASTRAN, used for the structural sizing and design, will be given.

Reliability-based structural design framework against accidental loads – ship collision

2018 ◽  
pp. 171-180
Author(s):  
Hyun-Moo Koh ◽  
Jeong-Hyun Lim ◽  
Hyunjoong Kim ◽  
Jiwoon Yi ◽  
Wonsuk Park ◽  
...  
Keyword(s):  
Structural Design ◽  
Design Framework ◽  
Ship Collision

scholarly journals EXPERIMENTAL DATA AND NUMERICAL SIMULATION OF WAVE LOADING AND ITS REDUCTION ON SHELTERED BUILDINGS

2020 ◽  
pp. 21
Author(s):  
Joaquin Moris ◽  
Andrew Kennedy ◽  
Joannes Westerink
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Structural Design ◽  
Structural Damage ◽  
Wave Loads ◽  
Wave Loading

Wave loading from inundation events like storms and tsunamis can cause severe structural damage to buildings (Xian et al., 2015); therefore, it is important to predict wave loading as accurately as possible. One uncertainty in estimating wave loads during inundation events is the possible reduction of loads by sheltering from other buildings. Understanding and quantifying this effect could reduce overestimated loads in sheltered buildings and avoid over-conservative structural design. This work aims to quantify the reduction of wave loads in sheltered buildings through the analysis of experimental data and numerical simulations.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/89QblLjDBnI

scholarly journals Multitarget, Selective Compound Design Yields Picomolar Inhibitors of a Kinetoplastid Pteridine Reductase 1

2020 ◽  
Author(s):  
Ina Poehner ◽  
Antonio Quotadamo ◽  
Joanna Panecka-Hofman ◽  
Rosaria Luciani ◽  
Matteo Santucci ◽  
...  
Keyword(s):  
Drug Discovery ◽  
Dihydrofolate Reductase ◽  
Multidisciplinary Approach ◽  
Microwave Assisted Synthesis ◽  
Crystallographic Structure ◽  
Computational Docking ◽  
Design And Optimization ◽  
Microwave Assisted ◽  
Structure Activity ◽  
Further Development

The optimization of compounds with multiple targets in the drug discovery cycle is a difficult multidimensional problem. Here, we present a systematic, multidisciplinary approach to the development of selective anti-parasitic compounds. Efficient microwave-assisted synthesis of pteridines along with iterations of crystallographic structure determination were used to validate computational docking predictions and support derivation of a structure-activity relationship for multitarget inhibition. This approach yielded compounds showing picomolar inhibition of <i>T. brucei</i> pteridine reductase 1 (PTR1), nanomolar inhibition of <i>L. major</i> PTR1, along with selective submicromolar inhibition of parasitic dihydrofolate reductase (DHFR). Moreover, by combining design for polypharmacology with a property-based on-parasite optimization, we found three compounds that exhibited micromolar EC<sub>50</sub> values against <i>T. brucei brucei</i>, whilst retaining their target inhibition. Our results provide a basis for the further development of pteridine-based compounds and we expect our multitarget approach to be generally applicable to the design and optimization of anti-infective agents.<br>

scholarly journals Multitarget, Selective Compound Design Yields Picomolar Inhibitors of a Kinetoplastid Pteridine Reductase 1

2020 ◽  
Author(s):  
Ina Poehner ◽  
Antonio Quotadamo ◽  
Joanna Panecka-Hofman ◽  
Rosaria Luciani ◽  
Matteo Santucci ◽  
...  
Keyword(s):  
Drug Discovery ◽  
Dihydrofolate Reductase ◽  
Multidisciplinary Approach ◽  
Microwave Assisted Synthesis ◽  
Crystallographic Structure ◽  
Computational Docking ◽  
Design And Optimization ◽  
Microwave Assisted ◽  
Structure Activity ◽  
Further Development

The optimization of compounds with multiple targets in the drug discovery cycle is a difficult multidimensional problem. Here, we present a systematic, multidisciplinary approach to the development of selective anti-parasitic compounds. Efficient microwave-assisted synthesis of pteridines along with iterations of crystallographic structure determination were used to validate computational docking predictions and support derivation of a structure-activity relationship for multitarget inhibition. This approach yielded compounds showing picomolar inhibition of <i>T. brucei</i> pteridine reductase 1 (PTR1), nanomolar inhibition of <i>L. major</i> PTR1, along with selective submicromolar inhibition of parasitic dihydrofolate reductase (DHFR). Moreover, by combining design for polypharmacology with a property-based on-parasite optimization, we found three compounds that exhibited micromolar EC<sub>50</sub> values against <i>T. brucei brucei</i>, whilst retaining their target inhibition. Our results provide a basis for the further development of pteridine-based compounds and we expect our multitarget approach to be generally applicable to the design and optimization of anti-infective agents.<br>

Structural design and optimization of large cable–rib tension deployable antenna structure with dynamic constraint

2018 ◽  
Vol 151 ◽  
pp. 160-172 ◽  
Author(s):  
Ruiwei Liu ◽  
Hongwei Guo ◽  
Rongqiang Liu ◽  
Hongxiang Wang ◽  
Dewei Tang ◽  
...  
Keyword(s):  
Structural Design ◽  
Antenna Structure ◽  
Design And Optimization ◽  
Dynamic Constraint
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