Optimization of marine vessels on the basis of tests on model series
- PDF / 1,847,750 Bytes
- 14 Pages / 595.276 x 790.866 pts Page_size
- 70 Downloads / 181 Views
ORIGINAL ARTICLE
Optimization of marine vessels on the basis of tests on model series Lawrence J. Doctors1 Received: 17 June 2019 / Accepted: 15 October 2019 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2019
Abstract The towing-tank resistance data for 20 series of ship models have been collated and processed in a unified manner. These data are presented here in a summarized manner showing the influence of the principal geometric parameters. The most significant parameter is the slenderness ratio which generally should be as large as possible in order to minimize the total resistance at full scale. It is demonstrated that the well-known DTMB Series 64 hulls possess the most promising geometry for the purpose of resistance minimization. It is further shown that the displacement of the prototype plays only a minor rôle. Thus, the general conclusions apply to any practical size of ship. Keywords Hull optimization · Ship-model extrapolation · Resistance reduction List of symbols AT Transom area AX Maximum-section area B Beam C Coefficient CA Correlation allowance CB Block coefficient CP Prismatic coefficient CVP Vertical prismatic coefficient F∇ Volumetric Froude number L Length LC Wetted chine length LK Wetted keel length LM Mean wetted length L∕∇1∕3 Slenderness ratio M1 Specific resistance at one speed M2 Specific resistance averaged N Number of test cases NB Number of test cases in a quantile or grouping RA Correlation resistance RF Frictional resistance RF0 Flat-plate frictional resistance RH Hydrostatic resistance RR Residuary resistance RT Total resistance * Lawrence J. Doctors [email protected] 1
RV Viscous resistance RW Wave resistance Ra Aerodynamic resistance Re Reynolds number S Wetted-surface area T Draft U Ship velocity W Displacement weight d Depth of water g Acceleration due to gravity k Frictional-resistance increment factor w Towing-tank or canal width Δ Displacement mass ΔP Prototype displacement mass 𝛽 Bow-down trim angle 𝜈 Kinematic viscosity of water 𝜌 Density of water ∇ Displacement volume ∗ Modification to original model series Abbreviations AHSMS Australian High-Speed-Monohull Series DL Davidson Laboratory DTMB David Taylor Model Basin DTNSRDC David W. Taylor Naval Ship Research and Development Center HSVA Hamburg Ship Model Basin ITTC International Towing-Tank Conference MARIN Maritime Research Institute Netherlands NPL National Physical Laboratory
The University of New South Wales, Sydney, NSW 2052, Australia
13
Vol.:(0123456789)
NSRDC Naval Ship Research and Development Center NSWC Naval Surface Warfare Center NTUA National Technical University of Athens SIT Stevens Institute of Technology SSPA Statens skeppsprovningsanstalt (Swedish State Shipbuilding Experimental Tank) TMB Taylor Model Basin USCG United States Coast Guard
1 Introduction 1.1 Background In the twentieth and twenty-first centuries, many researchers have investigated systematic series of ship models in towing tanks, in orde
Data Loading...
