Description of hull form and evaluation of ship performance (3rd Report)

1999 ◽  
Vol 1999 (185) ◽  
pp. 133-141
Author(s):  
Kayoko Arai ◽  
Yasunori Iwasaki ◽  
Ryusuke Hosoda
Keyword(s):  
Hull Form ◽  
Ship Performance

Effects of Hull Geometry and Tightness of Turns on Ship Maneuverability: An OSIS-IHI Simulation

2021 ◽  
Author(s):  
Michael Lau
Keyword(s):  
Performance Assessment ◽  
Ship Maneuvering ◽  
Hull Form ◽  
Structure Interaction ◽  
The Poor ◽  
Ship Maneuverability ◽  
Modeling Software ◽  
Body Design ◽  
Ship Performance ◽  
Shed Light

Abstract OSIS-IHI (Ocean Structure Interaction Simulator – Ice-Hull Interaction) is a ship maneuvering in ice modeling software developed at OCRE for a marine simulator and ship performance assessment applications. A series of OSIS-IHI simulations is conducted to explain the maneuvering behavior observed of the USCGC Polar Icebreaker indicative design previously tested at the centre. The simulation is conducted with the original and a modified version of the USCGC Icebreaker Healy. The Icebreaker USCGC Healy was equipped with doublescrew conventional propellers. The hull geometry of the OSIS-Healy model is appropriately modified to mimic the hull form of two indicated design versions in question and its propulsion units replaced by twin pods prior to studying its maneuverability in order to shed light on the apparently poor maneuvering performance of the podded version of the indicative design. The modified version extends the mid-body leaving just 7.5 % of hull that constitutes the stern section. It is hypothesized that the extended mid-section cost large resisting moment against turning due to the increase of ice breaking at the aft shoulder and mid-body. This hypothesis is validated numerically to explain the poor maneuverability exhibited by the extended mid-body design, based on consideration of ice-hull interaction geometry and basic mechanics of ice breaking as well as existing anecdotal test evidences. This paper presents result of the simulation to explore effects of hull geometry and tightness of turns on ship maneuverability. Important insights gained are summarized and recommendation for further work given.

Producibility in U.S. Navy Ship Design

1990 ◽  
Vol 6 (03) ◽  
pp. 139-150
Author(s):  
Hans A. Hofmann ◽  
Raymond S. Grant ◽  
Siu Fung
Keyword(s):  
Design Process ◽  
Cost Savings ◽  
Contract Design ◽  
Ship Design ◽  
Design Phase ◽  
Potential Cost ◽  
Hull Form ◽  
Form Design ◽  
Hull Form Design ◽  
Ship Performance

Recent NAVSEA studies of a twin-skeg hull form design applied to a T-AO type ship indicated many areas of possible improvement in producibility. This paper reviews the findings of producibility studies and attempts to indicate specific areas where an improvement in producibility and attendant cost savings for Navy ships are possible without any degradation in ship performance and survivability. Most available studies on producibility have an inherent trait of elaborating on details of shipyard producibility. This paper attempts to confine itself to the producibility aspect of the design phase, ending with the completion of contract design. It was determined that the concept of the producible, designed-to-build ship was worth further investigation for incorporation into future designs because of potential cost savings. The paper concludes with recommendations for a method of application of producibility to the Navy ship design process for MSC-operated T-ships.

scholarly journals Investigating the Performance of a Ship by Matching the Stern Hull Form to Propeller and Engine Power

2021 ◽  
Vol 3 (2) ◽  
pp. 154-159
Author(s):  
Andi Dian Eka Anggriani ◽  
Suandar Baso
Keyword(s):  
High Speed ◽  
Tip Clearance ◽  
Design Stage ◽  
Hull Form ◽  
Preliminary Ship Design ◽  
Free Running ◽  
Ship Performance ◽  
Ship Propeller ◽  
Ship Speed ◽  
Engine Power

Designing the form of the ship stern hull could have some impacts on the efficiency of ship propeller and the requirement of the ship speed. Therefore, stern hull form of a ship matched to its propeller and engine power is important consideration in preliminary ship design stage. The main objective of this study is to investigate ship performance by matching the stern hull shape to the propeller diameter and engine power toward high speed. This study was conducted by free running model test and Maxsurf Resistance application. The stern forms were employed U-shape and V-shape. In addition, the fixed pitch propeller (FPP) with three blades was used and the diameter is varied into three sizes 0.032 m, 0.040 m, and 0.048 m. The results show the increase of propeller diameter increases model’s speed for both U-shape and V-shape stern and the effect of the propeller diameter on the speed could be described by using the equations of second-order polynomial. The optimum propeller diameter could be determined taking into account stern hull form, stern shape, tip clearance, and proper speed where then propeller diameter related to draft is given by 0.79T with tip clearance 10%Dp for both U-shape and V-shape. The ship resistances of U-shape stern at Fr 0.221 and V-shape at 0.208 are obtained approximately 89.797 KN and 77.10 KN respectively. Furthermore, the powers of ship for both U-shape and V-shape at those Fr are obtained 904,374 KW and 726,807 KW respectively. Finally, the best stern hull form matched to propeller diameter and engine power is selected and given by U-shape stern.

Ship Climate and Ship Performance

2011 ◽  
Author(s):  
L. A. Witt ◽  
Emily David ◽  
Marinus van Driel
Keyword(s):  
Ship Performance

Advanced Hull Form Inshore Demonstrator. Model Strut and Propulsor Performance in Uniform Flow

2002 ◽  
Author(s):  
Kirk J. Anderson ◽  
Carmen G. Borda ◽  
Martin J. Donnelly
Keyword(s):  
Uniform Flow ◽  
Hull Form

scholarly journals Ship Handling in Unprotected Waters: A Review of New Technologies in Escort Tugs to Improve Safety

2021 ◽  
Vol 2 (1) ◽  
pp. 46-62
Author(s):  
Santiago Iglesias-Baniela ◽  
Juan Vinagre-Ríos ◽  
José M. Pérez-Canosa
Keyword(s):  
High Performance ◽  
New Technologies ◽  
Weather Conditions ◽  
Hull Form ◽  
Best Available Technologies ◽  
Adverse Weather Conditions ◽  
Adverse Weather ◽  
New Type ◽  
Technological Challenge ◽  
And Performance

It is a well-known fact that the 1989 Exxon Valdez disaster caused the escort towing of laden tankers in many coastal areas of the world to become compulsory. In order to implement a new type of escort towing, specially designed to be employed in very adverse weather conditions, considerable changes in the hull form of escort tugs had to be made to improve their stability and performance. Since traditional winch and ropes technologies were only effective in calm waters, tugs had to be fitted with new devices. These improvements allowed the remodeled tugs to counterbalance the strong forces generated by the maneuvers in open waters. The aim of this paper is to perform a comprehensive literature review of the new high-performance automatic dynamic winches. Furthermore, a thorough analysis of the best available technologies regarding towline, essential to properly exploit the new winches, will be carried out. Through this review, the way in which the escort towing industry has faced this technological challenge is shown.

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