Identification of hydrodynamic coefficients for manoeuvring simulation model of a fishing vessel (original) (raw)
Related papers
2003
Most formulations of mathematical modelling of ship manoeuvres in shallow water discussed in literature are based on expressions for the deep water case. Several usual and unusual phenomena occurring during manoeuvres at limited under keel clearance (10% to 50%) are not considered. A tabular model for the hull forces is proposed, taking the shallow water condition as starting point, with the intention to cover wide ranges of kinematical parameters so that a great variety of manoeuvres can be simulated. The implementation of the mathematical model is based on captive model tests with 4 m models of the tanker Esso Osaka and a fourth generation container carrier. The experimental program consists of well-known, classical PMM test types combined with alternative tests. Preliminary guidelines are formulated for the selection of test parameters, taking account of their influence on the hydrodynamic coefficients.
Captive model tests based 6 DOF shallow water manoeuvring model
2016
This article presents the formulation of the 6 DOF manoeuvring model in calm water for ships with conventional propulsion and steering (1 fixed propeller, 1 stock rudder) as it is used on the ship manoeuvring simulators at Flanders Hydraulics Research (FHR). The coefficients are determined based on the results of captive model tests carried out in the Towing Tank for Manoeuvres in Shallow Water at FHR (co-operation with Ghent University). In this article the benchmark ship KVLCC2 is used as an example for discussion, based on the tests that were carried out at full draft and water depths of 180%, 130% and 120% of the draft. Fast time simulations have been carried out based on the developed manoeuvring model and the trajectories in 6 DOF are compared with the SIMMAN 2014 benchmark manoeuvres. * propeller loading angle for sway (deg) * phase angle (deg) yaw-drift correlation angle (deg)
Manoeuvring model of a container vessel in coastal waves
2018
The prediction of the ship's behaviour has always been a major focus of attention to the maritime sector, this in order to provide answers to questions regarding safety of the ship's crew and the ship itself. Throughout the ship's voyage from departure to arrival in a port, the ship will navigate, manoeuvre, under the effect of different environmental conditions such as, current, wind, waves,
Development of a test program for the prediction of ship manoeuvrability in deep and shallow water
2006
As in many coastal and estuary areas, navigation to and in the Belgian harbours takes place in environmental and operational conditions which differ from the design conditions of seagoing ships: water depth to draft ratios vary between 2.0 and 1.1 which means that the under keel clearance is often restricted to 10% of the ship’s draft. In addition, low ship velocities have to be considered as manoeuvring in harbour areas is characterised by a wide range of speed – propeller rpm combinations. Based on the results of captive model tests executed in the Towing Tank for Manoeuvres in Shallow Water (co-operation Flanders Hydraulics Research – Ghent University, Antwerp, Belgium) with a 6000 TEU containership and the tanker Esso Osaka, an optimized test program has been developed for the determination of a mathematical manoeuvring model in laterally unrestricted water. Contrary to deep water and service speed the selected test types and test parameters will influence the measured contribut...
Experimental hydrodynamics and simulation of manoeuvring of an axisymmetric underwater vehicle
2009
Experimental study of the hydrodynamics of an underwater vehicle requires state-of-the-art facilities, precise design of the experiment and careful analysis of the results. This thesis presents hydrodynamic observations resulting from experiments that were performed on a series of five bare-hull configurations of slender axisymmetric underwater vehicles and also reports a simulation code to predict the manoeuvring behaviour of a real underwater vehicle: MUN Explorer. The main aim is to find the correct form of the physically-based expressions for the hydrodynamic loads that are exerted on completely-submerged underwater vehicles during various manoeuvres and use this improved knowledge to obtain a better prediction of the manoeuvring of an underwater vehicle. -- Straight-ahead resistance tests and static-yaw runs up to 20 degrees yaw angle for the axisymmetric bare-hull configurations that were performed in the 90 metre towing tank at the Institute for Ocean Technology, National Res...
2006
The Flemish waterways authorities are permanently concerned about safety of navigation to the Flemish harbours in order to maintain their present position in the European shipping market. Special attention is paid to the effect of the constant growth of ship dimensions, especially in the container trade, on the safety of shipping traffic. Access to and manoeuvring in harbours are characterised by a great diversity of kinematical and control parameters. In 2004-2005 a captive model test program has been executed with a 4.3 m model of an 8000 TEU containership (scale 1:81) combining three distinguished drafts and three under keel clearances from deep to very shallow water. This test program covering all possible combinations of ship velocities and propeller telegraph positions has been used to evaluate hull, propeller and rudder forces to be incorporated in a manoeuvring simulation model applicable in the four quadrants of operation. The influence of combinations of draft and under ke...
Manoeuvring prediction of pusher barge in deep and shallow water
Ocean Engineering, 2011
This paper presents an experimental investigation on the manoeuvring characteristics of a pusherbarge system for deep (H/d 4 3) and shallow water (H/d ¼1.3) condition. Since, the operation of pusherbarge mainly concentrates on confined waters, there is a need to predict and analyze the manoeuvring characteristic of the system for a safe and acceptable performance. A time domain simulation programme was developed for this purpose. A series of model experiments were carried out to determine the hydrodynamic coefficients using a planar motion mechanism (PMM). The time domain simulation shows the manoeuvring characteristic in the form of turning circle trajectories and zig-zag manoeuvre based on the hydrodynamic coefficients, which were derived based on experimental results. The manoeuvring characteristics in shallow and deep water conditions were compared through the simulation results. A comparison of simulation results based on experimental and empirical driven coefficients for both conditions shows that the experimental coefficients gave better manoeuvring characteristics for both turning circle trajectories and zig-zag manoeuvre.
“Esso Osaka” tanker manoeuvrability investigations in deep and shallow water, using PMM
International shipbuilding progress, 1987
Results of the experimental investigation of the effects of finite water depth on the hydrodynamic forces and moments acting on ship model moving in the horizontal plane are presented. The structure of the mathematical model used is verified after the multiple hnear regression and dispersion analysis methods. Comparison between the fuh scale and predicted ship manoeuvrabhity characteristics are made. This work is carried out at BSHC, Varna, Bulgaria with the help of PMM. 2.1. Experimental equipment and ship model
Prediction of Manoeuvring Behaviour of an Offshore Supply Vessel by Using Simulation Program
Manoeuvring ability of Offshore Supply Vessel (OSV) is a very critical aspect. An early prediction of vessel behaviour will definitely help to improve upon the design. The regular methods available for manoeuvring prediction such as free running model test, captive model test etc., are found to be expensive and time consuming. As an alternative, the current approach tries a numerical simulation method with parameters determined from a database. This study presents the manoeuvring prediction of an OSV which includes the development of time domain simulation program by using Matlab Simulink software. Three degrees of freedom were considered and applying the Newtonian laws, the equations of motion were framed. Further, forces on hull, forces and moments induced by propeller and rudder were also taken into reckoning. Results were obtained with inputs of vessel speeds, engine revolutions etc. Validation of the prediction results was also carried out by comparing the results with full-scale sea trial data. The prediction results show a good agreement with the sea trial data. Applying approximate numerical formula for manoeuvring prediction is seen to be a reliable and economic prediction tool at early design stages of such vessels.