Nonlinear Identification For 4 DOF Ship Maneuvering Modeling Via Full-Scale Trial Data

2021 ◽  
pp. 1-1
Author(s):  
Song Chunyu ◽  
Xianku Zhang ◽  
Guoqing Zhang
Keyword(s):  
Trial Data ◽  
Full Scale ◽  
Nonlinear Identification ◽  
Ship Maneuvering

scholarly journals Full-Scale Maneuvering Trials Correction and Motion Modelling Based on Actual Sea and Weather Conditions

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3963
Author(s):  
Bin Mei ◽  
Licheng Sun ◽  
Guoyou Shi
Keyword(s):  
Wind Waves ◽  
Measurement Data ◽  
Correction Method ◽  
Pattern Search ◽  
Full Scale ◽  
Sea Surface ◽  
Surface Currents ◽  
Hydrodynamic Coefficients ◽  
Ship Maneuvering ◽  
Ship Maneuverability

Aiming at the poor accuracy and difficult verification of maneuver modeling induced by the wind, waves and sea surface currents in the actual sea, a novel sea trials correction method for ship maneuvering is proposed. The wind and wave drift forces are calculated according to the measurement data. Based on the steady turning hypothesis and pattern search algorithm, the adjustment parameters of wind, wave and sea surface currents were solved, the drift distances and drift velocities of wind, waves and sea surface currents were calculated and the track and velocity data of the experiment were corrected. The hydrodynamic coefficients were identified by the test data and the ship maneuvering motion model was established. The results show that the corrected data were more accurate than log data, the hydrodynamic coefficients can be completely identified, the prediction accuracy of the advance and tactical diameters were 93% and 97% and the prediction of the maneuvering model was accurate. Numerical cases verify the correction method and full-scale maneuvering model. The turning circle advance and tactical diameter satisfy the standards of the ship maneuverability of International Maritime Organization (IMO).

Nonlinear identification of torsional driveshaft vibrations in a full-scale automotive vehicle during acceleration

2016 ◽  
Vol 86 (1) ◽  
pp. 711-721 ◽  
Author(s):  
Katsutoshi Yoshida ◽  
Hideki Takamatsu ◽  
Shigeki Matsumoto
Keyword(s):  
Full Scale ◽  
Nonlinear Identification ◽  
Automotive Vehicle

scholarly journals On the possibility of employing a surveillance radar station to solve the problems of locating points of aim (points of impact)

2016 ◽  
pp. 13-19
Author(s):  
A. B. Blyakhman ◽  
S. N. Matyugin ◽  
A. G. Prokhorov
Keyword(s):  
Mathematical Model ◽  
Data Analysis ◽  
Target Recognition ◽  
Trial Data ◽  
Full Scale ◽  
Radar Station

We consider the possibility of employing a surveillance radar station to recognise ballistic targets (projectiles) and locate points of aim. We present the results of full-scale live-fire trial data analysis and a method for implementing ballistic target (projectile) recognition by radar stations of the surveillance type. We developed a mathematical model, an algorithm for ballistic target recognition, as well as algorithms and software to locate the point of aim

Time Domain Simulation Model for Research Vessel Gunnerus

2015 ◽  
Author(s):  
Vahid Hassani ◽  
Andrew Ross ◽  
Ørjan Selvik ◽  
Dariusz Fathi ◽  
Florian Sprenger ◽  
...  
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Trial Data ◽  
Full Scale ◽  
Dynamic Equations ◽  
Scale Model ◽  
Research Vessel ◽  
Oil Exploration ◽  
Time Domain Simulation ◽  
Sea Trial

A research vessel (RV) plays an important role in many fields such as oceanography, fisheries and polar research, hydrographic surveys, and oil exploration. It also has a unique function in maritime research and developments. Full-scale sea trials that require vessels, are usually extremely expensive; however, research vessels are more available than other types of ship. This paper presents the results of a time-domain simulation model of R/V Gunnerus, the research vessel of the Norwegian University of Science and Technology (NTNU), using MARINTEK’s vessel simulator (VeSim). VeSim is a time-domain simulator which solves dynamic equations of vessel motions and takes care of seakeeping and manoeuvring problems simultaneously. In addition to a set of captive and PMM tests on a scale model of Gunnerus, full-scale sea trials are carried out in both calm and harsh weather and the proposed simulation model is validated against sea trial data.

Scale Effects on Ship Maneuverability Using RANS

2018 ◽  
Author(s):  
Motoki Araki
Keyword(s):  
Cfd Simulation ◽  
Scale Effects ◽  
Full Scale ◽  
Navier Stokes ◽  
Cfd Simulations ◽  
Ship Maneuvering ◽  
Ship Maneuverability ◽  
Computational Fluid Dynamics Cfd ◽  
Rudder Angle ◽  
Maneuvering Simulations

Predicting ship maneuverability is one of the important topics in ship engineering. However because of the huge difference between model and full scale Reynolds number (Re), it is almost impossible to predict full scale ship maneuverability using conventional methods such as model test. On the other hands, with the developments of computational technologies and computational fluid dynamics (CFD) techniques, CFD simulations are widely applied on ship maneuvering problems (e.g. Stern et al., 2011). Moreover some of the researchers start the CFD simulation with full scale Re especially on propulsion problems (e.g. Tezdogan et al., 2015) which showing reasonable results. Therefore, in this paper, captive maneuvering simulations (rudder angle test) in model/full scale Re on KVLCC2 are carried out using Reynolds-averaged Navier–Stokes (RANS) solver NAGISA (Ohashi et al., 2014) with the overset gird method UP_GRID (Kodama et al., 2012). And the results between model and full scale simulations are compared in maneuvering coefficients and flow field to reveal the scale effect on ship maneuverability.

Ship-Model Correlation of Powering Performance on USS Oliver Hazard Perry, FFG-7 Class

1983 ◽  
Vol 20 (01) ◽  
pp. 35-52
Author(s):  
Everett L. Woo ◽  
Gabor Karafiath ◽  
Gary Borda
Keyword(s):  
Performance Prediction ◽  
Prediction Method ◽  
Model Tests ◽  
Trial Data ◽  
Full Scale ◽  
Ship Model ◽  
Single Screw ◽  
Post Trial ◽  
Model Correlation

Standardization trials were conducted on USS Oliver Hazard Perry (FFG-7) in May 1978. From the results of the trial data and the post-trial model correlation experiments which simulated the trial conditions, the powering correlation allowance of 0.00045 was obtained for the FFG-7. It should be noted that the pretrial model tests used the design correlation allowance of 0.0005 to predict full-scale powering performance. In addition, the powering performance was predicted using the "1978 ITTC Performance Prediction Method for Single Screw Ships."

An Overview of Stepped Hull Performance Evaluation: Sea Trial Data vs Full-Scale CFD Simulation

2020 ◽  
Author(s):  
Luigi Vitiello ◽  
Simone Mancini ◽  
Rasul Niazmand Bilandi ◽  
Vincenzo Nappo
Keyword(s):  
Performance Evaluation ◽  
High Speed ◽  
Cfd Simulation ◽  
Experimental Tests ◽  
Trial Data ◽  
Full Scale ◽  
Cfd Simulations ◽  
Sea Trial ◽  
Comparison Of The Results ◽  
Real Scale

It is well known that the dynamic of the stepped hull in real scale is rather complex and it’s not easy to predict that using empirical or mathematical approaches, and by the numerical and experimental way as well. Moreover, there is a huge lack in the literature of data related to sea trials of the stepped hull. Furthermore, the reliability of full-scale CFD simulations is not widely proven and validated especially for high speed and planing hull. For these several reasons, in this paper, the authors are focused on the comparison of the results carried out from model experimental tests performed in the model basin, full-scale CFD simulations, and sea trial tests. The performed simulations in full-scale have been compared to the extrapolated experimental tests and the sea-trial results. Moreover, the dynamic trim angle and the dynamic wetted surface have been taken into account to assess the reliability of the full-scale simulation performed. The stepped hull considered is a Mito 31 outboard Rigid Inflatable Boat (RIB) built by MV Marine Srl Company.

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