scholarly journals Performance prediction of full-scale ship and analysis by means of on-board monitoring (Part 1 ship performance prediction in actual seas)

2018 ◽  
Vol 24 (1) ◽  
pp. 16-33 ◽  
Author(s):  
Masaru Tsujimoto ◽  
Hideo Orihara
Keyword(s):  
Performance Prediction ◽  
Full Scale ◽  
Board Monitoring ◽  
Ship Performance ◽  
Actual Seas

Full-Scale Linear Cutting Tests to Propose Some Empirical Formulas for TBM Disc Cutter Performance Prediction

2019 ◽  
Vol 52 (11) ◽  
pp. 4763-4783 ◽  
Author(s):  
Yucong Pan ◽  
Quansheng Liu ◽  
Xingxin Peng ◽  
Qi Liu ◽  
Jianping Liu ◽  
...  
Keyword(s):  
Performance Prediction ◽  
Full Scale ◽  
Disc Cutter ◽  
Empirical Formulas

Development of a Ship Performance Simulator in Actual Seas

2015 ◽  
Author(s):  
Masaru Tsujimoto ◽  
Naoto Sogihara ◽  
Mariko Kuroda ◽  
Akiko Sakurada
Keyword(s):  
Energy Efficiency ◽  
Fuel Consumption ◽  
Hydrodynamic Performance ◽  
Wave Forces ◽  
Ship Hydrodynamic ◽  
Main Engine ◽  
Ship Performance ◽  
Actual Seas ◽  
Ship Speed ◽  
Drift Forces

Greenhouse gas shall be reduced from shipping sector. For that purpose the regulation of EEDI (energy efficiency design index for new ships) and SEEMP (ship energy efficiency management plan) were entry into force from 2013. In order to improve energy efficiency of ships in service it is necessary to predict the fuel consumption in actual seas. In order to reduce GHG emission from ships, a Vessel Performance Simulator in Actual Seas has been developed. It simulates ship speed and fuel consumption at steady condition by using weather data and designated engine revolution. Physical models for hull, propeller, rudder and engine are used in the simulator. Especially steady wave forces, wind forces, drift forces, steering forces and engine/governor model are important factor for the estimation. The fuel consumption should be evaluated combined the ship hydrodynamic performance with the engine/governor characteristics. Considering the external forces by winds and waves, the operation point of the main engine is important for the estimation, since the torque limit and the other limit of the engine/governor are affected to the ship hydrodynamic performance. To prevent the increase of fuel consumption in service, the engine control system by the Fuel Index has been applied to present ships. In rough weather condition the revolution of the main engine is reduced to lower revolution by the Fuel Index limit. It causes the large decrease of ship speed but reduces the fuel consumption due to reduction of engine revolution. Using the simulator the navigation performance of a container ship, a RoRo vehicle carrier and a bulk carrier is simulated along the route. In this paper following contents are discussed; 1) evaluation of the physical model; steady wave forces, wind forces, drift forces, steering forces and engine/governor model, 2) simulation and validation of the physical model by tank tests and on-board measurements and 3) effectiveness of the ship performance simulator for GHG reduction.

Detailed Study on the Behavior of Ships in Very Short Waves

2020 ◽  
Author(s):  
Saori Yokota ◽  
Mariko Kuroda ◽  
Ryohei Fukasawa ◽  
Hiroki Ohba ◽  
Masaru Tsujimoto
Keyword(s):  
Sensitivity Analysis ◽  
Fuel Consumption ◽  
Added Resistance ◽  
Regular Waves ◽  
Short Waves ◽  
Added Resistance In Waves ◽  
Tank Test ◽  
Ship Performance ◽  
Ship Operation ◽  
Actual Seas

Abstract Considering the sea conditions in which a large ship encountered in operation, the ship’s behavior in very short waves is important. However, the evaluation of the ship performance in very short waves was not enough validated by tank tests. Because it is difficult to generate waves with enough accuracy due to the performance of the wave generator. In this paper, it is shown that tank tests of added resistance in the regular waves including the very short waves are conducted in the Actual Sea Model Basin at National Maritime Research Institute, MPAT for DTC container ship and accurate results are obtained. The test results are compared with the benchmarks published by SHOPERA (Energy Efficient Safe SHip OPERAtion). In addition, three curves of the added resistance in the regular waves based on the results of the tank test are compared and the sensitivity analysis of energy efficiency is discussed. In the sensitivity analysis, the performance simulator for ships in actual seas (VESTA) is used, and a comparison is carried out for the fuel consumption calculated from the frequency response of each added resistance in waves. As a result, it is found that the tendency in added resistance in very short waves affects the fuel consumption and the decrease of ship speed.

The Interpretation of Results from Tank Tests on 12M Yachts

1987 ◽  
Author(s):  
Ian Campbell ◽  
Andrew Claughton
Keyword(s):  
Performance Prediction ◽  
Measurement Techniques ◽  
Reliable Data ◽  
Full Scale ◽  
Flow Visualisation ◽  
Measurement Systems ◽  
Components Of Resistance ◽  
Tank Test ◽  
Interpretation Of Results

Current Wolfson Unit tank test techniques are described and results presented that demonstrate how reliable data can be obtained from yacht models using simple equipment and measurement systems. The results presented are from models of 12m Yachts tested at both 1:10 and 1:4 scale. The correlation with full scale performance is shown for a 12m Yacht with a conventional keel. The induced and heeled components of resistance, obtained from tests at both scales, are compared for both the conventional and a winged keel. The interpretation of various characteristics in the tank data and the use of flow visualisation and measurement techniques are discussed. Scaling problems are considered and also shown is the influence of sail coefficients on the performance prediction for a 12m Yacht.

PERFORMANCE PREDICTION OF WIND PROPULSION SYSTEMS USING 3D CFD AND ROUTE SIMULATION

2019 ◽  
Author(s):  
A Persson ◽  
D.-Q. Li ◽  
F Olsson ◽  
S Werner ◽  
U Dhomé
Keyword(s):  
Performance Prediction ◽  
New Technology ◽  
Vortex Formation ◽  
Propulsion Systems ◽  
Cfd Simulations ◽  
Energy Saving Potential ◽  
Reasonable Cost ◽  
Accurate Performance ◽  
3D Effects ◽  
Ship Performance

Accurate performance prediction is necessary when designing/optimising wind propulsion systems (WPS). An independent, trustworthy prediction of the energy-saving potential is also needed to support the ship owner’s decision to invest in new technology. By using weather statistics along with a mathematical model of ship performance, route simulations can estimate the time and power required for transit of a route. Such simulations are commonly used today to optimise the design and operation of conventional ships. The introduction of WPS poses additional challenges for route simulations. WPS performance must be predicted at all points along the route, with wind of differing velocity and direction. The apparent wind will vary vertically (twist), due to the interaction between the ship velocity and the atmospheric boundary layer. Also, many proposed concepts use multiple WPS, introducing additional complexity, such as independent spin ratios/ sheeting angles. 3D CFD simulations capture the complex physics, including vortex formation and interaction effects, providing accurate performance prediction and an understanding of the flow. However, 3D CFD is costly, and it would not be possible to simulate all conditions at a reasonable cost. We present simplified approaches to modelling of WPS, using a limited number of CFD simulations, either in 2D or 3D, which are then extrapolated such that 3D effects are represented, and all conditions covered. The methodology is demonstrated on rotor sails and wing sails.

Scale Experiments with the 5.5 Metre Yacht ANTIOPE

1974 ◽  
Author(s):  
Karl L. Kirkman
Keyword(s):  
Performance Prediction ◽  
Full Scale ◽  
Hydrodynamic Performance ◽  
Prediction Methods ◽  
Ship Model ◽  
The Family

A program of Experiments with a series of four geometrically similar yacht hull models was conducted in the HYDRONAUTICS’ Ship Model Basin with the aim of improving engineering methods for model/full-scale correlation. The paper presents a brief review of the background of existing hydrodynamic performance prediction methods, outlines a number of scaling problems, and presents results from the family of models tested.

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