Numerical and experimental study on hydroelasticity in water-entry problem of a composite ship-hull structure

2018 ◽  
Vol 201 ◽  
pp. 942-957 ◽  
Author(s):  
Hang Xie ◽  
Huilong Ren ◽  
Sen Qu ◽  
Haoyun Tang
Keyword(s):  
Experimental Study ◽  
Water Entry ◽  
Ship Hull ◽  
Hull Structure ◽  
Composite Ship

Experimental Study of a Tanker Ship Squat in Shallow Water

2014 ◽  
Vol 66 (2) ◽  
Author(s):  
Mohammadreza Fathi Kazerooni ◽  
Mohammad Saeed Seif
Keyword(s):  
Experimental Study ◽  
Shallow Water ◽  
Experimental Approach ◽  
Model Tests ◽  
Ship Hull ◽  
Experimental Results ◽  
Shallow Waters ◽  
Towing Tank ◽  
Ship Model

One of the phenomena restricting the tanker navigation in shallow waters is reduction of under keel clearance in the terms of sinkage and dynamic trim that is called squatting. According to the complexity of flow around ship hull, one of the best methods to predict the ship squat is experimental approach based on model tests in the towing tank. In this study model tests for tanker ship model had been held in the towing tank and squat of the model are measured and analyzed. Based on experimental results suitable formulae for prediction of these types of ship squat in fairways are obtained.

Residual Stress on Ship Hull Structure

1998 ◽  
Vol 14 (04) ◽  
pp. 277-286
Author(s):  
Yasuhisa Okumoto
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Ship Hull ◽  
Ship Structure ◽  
Heat Process ◽  
Steel Material ◽  
Hull Structure ◽  
Hull Strength

It is well known that ship structure experiences residual stresses due to heat process of steelmaking and assembly (cutting, bending, welding, straightening, etc.), and that these stresses affect ship hull strength. However, such stresses are usually not considered in strength calculations, because they are quantitatively ambiguous. This paper reviews the residual stresses in ship hull structure in accordance with each production step, including steel material, with reference to past measurements and analyses.

Experimental Study on Slamming Pressure and Hydroelastic Vibration of a Flat Plate during Water Entry

2015 ◽  
Vol 73 ◽  
pp. 594-599 ◽  
Author(s):  
Fasuo Yan ◽  
Chengxiang Zhang ◽  
Liping Sun ◽  
Dagang Zhang
Keyword(s):  
Experimental Study ◽  
Flat Plate ◽  
Water Entry

scholarly journals DEVELOPMENT OF STRUCTURAL SOLUTIONS FOR PREVENTION OF WAVE RUN-UP OF THE BOW

2017 ◽  
pp. 7-14
Author(s):  
Pavel Evgenievich Burakovskiy
Keyword(s):  
Hydrodynamic Force ◽  
Stability Loss ◽  
Critical Value ◽  
Ship Hull ◽  
Hydrodynamic Impact ◽  
Hull Structure ◽  
Run Up ◽  
Hull Damage ◽  
Structural Solutions ◽  
Navigation Safety

One of the most dangerous situations for seagoing ships is wave run-up in a head sea. In such a case, significant hydrodynamic forces appear resulting in stability loss or ship hull damage. The paper presents structural solutions that contribute towards navigation safety by means of decreasing probability of wave run-up of the ship bow in a head sea. A design has been developed of a ship stabilizer in the form of hinge-mounted stabilizing wings which deflect from the hull when the bow submerges in water and then cling to it when it emerges. The paper presents a new design of the bulwark with rotating sections able to rotate in the direction from the deck to the board. These designs can reduce dipping in a wave and reduce hydrodynamic impact on the bow. Apart from this, a hull structure has been proposed with a detachable bow to prevent capsizing of a ship. If the hydrodynamic force reaches a critical value, destruction of a permanent joint will happen in the proposed design, resulting in the situation when leak-proof aft and bow parts detach and remain afloat, which will allow the crew to evacuate. The proposed designs will increase navigation safety in storm conditions.

Dimensional Measurement of a Composite Ship Hull Using Coherent Laser Radar Yielding Submillimeter Results

2004 ◽  
Vol 20 (04) ◽  
pp. 232-239
Author(s):  
Steven D. Hand ◽  
David B. Ober ◽  
Bryan A. Bond ◽  
Edward A. Devine
Keyword(s):  
Computer Aided Design ◽  
Focal Length ◽  
Ship Hull ◽  
Laser Radar ◽  
Dimensional Measurement ◽  
Reinforced Plastic ◽  
Fiberglass Composite ◽  
Coherent Laser Radar ◽  
Composite Ship ◽  
Aided Design

The use and result of coherent laser radar as a noncontact method for the dimensional measurement of a ship hull is described. The hull, keel, and deck of a halfscale notional glass-reinforced plastic (fiberglass) composite hull test specimen are measured to submillimeter accuracy and then compared to the computer-aided design (CAD) model for conformance validation. Positives and negatives of this technology are the subject of this paper and include the high accuracy potential of the coherent laser radar, the minimal manpower requirements needed to achieve accurate results, and the limitation of the equipment's digital focal length and its effects on setup and data acquisition.

Experimental study on the influence of the angle of attack on cavity evolution and surface load in the water entry of a cylinder

2021 ◽  
Vol 219 ◽  
pp. 108271
Author(s):  
Tiezhi Sun ◽  
Chongbin Shi ◽  
Guiyong Zhang ◽  
Zhi Zong ◽  
Heng Wang
Keyword(s):  
Experimental Study ◽  
Angle Of Attack ◽  
Water Entry ◽  
Surface Load ◽  
Cavity Evolution

An experimental study on water entry of a 3D bow-flare model with pitch angles

2021 ◽  
Vol 219 ◽  
pp. 108282
Author(s):  
Hang Xie ◽  
Xuefeng Wei ◽  
Fang Liu ◽  
Huilong Ren ◽  
Xinyu Liu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Water Entry ◽  
Bow Flare ◽  
Flare Model

An experimental study on water entry of asymmetric wedges

2016 ◽  
Vol 58 ◽  
pp. 292-304 ◽  
Author(s):  
Mojtaba Barjasteh ◽  
Hamid Zeraatgar ◽  
Mohammad Javad Javaherian
Keyword(s):  
Experimental Study ◽  
Water Entry
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