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.

Comparison of Application of SVC and STATCOM on Suppressing Subsynchronous Oscillation

2014 ◽  
Vol 1070-1072 ◽  
pp. 1144-1149 ◽  
Author(s):  
Qin Lei Chen ◽  
Chun Lin Guo
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Reactive Power ◽  
Control Strategies ◽  
Basic Function ◽  
Time Domain Simulation ◽  
Dynamic Compensation ◽  
Benchmark Model ◽  
Subsynchronous Oscillation ◽  
Facts Devices

As the main types of parallel FACTS devices, the basic function of SVC and STATCOM is to realize the dynamic compensation of reactive power and maintain system voltage stability. However, when new control strategies are added to them .Both of them can suppress SSO effectively. Based on IEEE first benchmark model, this paper established simulation model by PSCAD/EMTDC. The effects of suppressing SSO by SVC/STATCOM are verified with time domain simulation, and the comparative analyses are carried out on the effects of suppressing SSO by SVC and STATCOM.

0605 Time domain simulation model for active fixturing in milling

2015 ◽  
Vol 2015.8 (0) ◽  
pp. _0605-1_-_0605-6_ ◽  
Author(s):  
Antonio SCIPPA ◽  
Filippo MONTEVECCHI ◽  
Niccolo GROSSI ◽  
Lorenzo SALLESE ◽  
Gianni CAMPATELLI
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Time Domain Simulation

Infrared Signature Suppression for Marine Gas Turbines: Comparison of Sea Trial and Model Test Results for the DRES Ball IRSS System

1994 ◽  
Vol 116 (1) ◽  
pp. 75-81 ◽  
Author(s):  
A. M. Birk ◽  
D. VanDam
Keyword(s):  
Model Test ◽  
Gas Turbines ◽  
Flow Model ◽  
Full Scale ◽  
Scale Model ◽  
Test Results ◽  
Sea Trial ◽  
Infrared Signature ◽  
Plume Temperature ◽  
Better Than

Sea Trials have recently been underway for Canada’s new City Class Patrol Frigate (CPF). These trials provided the first opportunity to measure the performance of the new DRES Ball Infrared Signature Suppression (IRSS) system installed on a ship. Prior to these trials 1/4-scale hot flow model test and computer simulation performance results were available. The CPF DRES Ball IRSS systems are installed on the exhaust uptakes of the GE LM2500 main gas turbines. The DRES Ball provides both metal surface cooling for all view angles and plume cooling. The DRES Ball significantly reduces the IR signature of the LM2500 exhaust. This paper presents a comparison between the 1/4-scale hot flow model test results with the full-scale sea trial results. Performance variables included in the comparison are: metal surface temperatures, back pressure, plume temperature distribution, and surface static pressures. Because of the confidential nature of the DRES Ball system performance, all classified data have been nondimensionalized so that only relative comparisons can be made between the full-scale and 1/4-scale data. The results show that the full-scale system performs better than the 1/4-scale model because of Reynolds number effects. The plume temperature, surface temperatures, and back pressure were all lower (better) than in the 1/4-scale model tests. One of the original concerns with the installation was that relative wind would degrade the performance of the DRES Ball onboard a ship. The wind effect was found to be benign during the trials.

Infra-Red Signature Suppression for Marine Gas Turbines: Comparison of Sea Trial and Model Test Results for the DRES Ball IRSS System

1992 ◽  
Author(s):  
A. M. Birk ◽  
D. Vandam
Keyword(s):  
Model Test ◽  
Gas Turbines ◽  
Flow Model ◽  
Full Scale ◽  
Scale Model ◽  
Test Results ◽  
Sea Trial ◽  
Infra Red ◽  
Plume Temperature ◽  
Better Than

Sea Trials have recently been underway for Canada’s new City Class Patrol Frigate (CPF). These trials provided the first opportunity to measure the performance of the new DRES Ball Infra-red Signature Suppression (IRSS) system installed on a ship. Prior to these trials 1/4 scale hot flow model test and computer simulation performance results were available. The CPF DRES Ball IRSS systems are installed on the exhaust uptakes of the GE LM2500 main gas turbines. The DRES Ball provides both metal surface cooling for all view angles and plume cooling. The DRES Ball significantly reduces the IR signature of the LM2500 exhaust. This paper presents a comparison between the 1/4 scale hot flow model test results with the full scale sea trial results. Performance variables included in the comparison are; metal surface temperatures, back pressure, plume temperature distribution, and surface static pressures. Because of the confidential nature of the DRES Ball system performance, all classified data has been nondimensionalized so that only relative comparisons can be made between the full scale and 1/4 scale data. The results show that the full scale system performs better than the 1/4 scale model because of Reynolds number effects. The plume temperature, surface temperatures and back pressure were all lower (better) than in the 1/4 scale model tests. One of the original concerns with the installation was that relative wind would degrade the performance of the DRES Ball onboard a ship. The wind effect was found to be benign during the trials.

scholarly journals Study on submerging operation design for heavy-lift barges based on a real case analysis

2017 ◽  
Vol 233 (1) ◽  
pp. 363-371
Author(s):  
Xin Wang ◽  
Wei Jun Ko
Keyword(s):  
High Risk ◽  
Time Domain ◽  
Case Analysis ◽  
Offshore Structures ◽  
Time Domain Simulation ◽  
Ballast Tank ◽  
Sea Trial ◽  
Heavy Lift ◽  
Simulation Results

Semi-submersible heavy-lift barges are widely used for transporting large offshore structures over long distances. The float-on and float-off operations of such vessels are considered as high-risk tasks even today. Improper flooding sequence may lead to accidents including loss of vessels and human lives. The main objective of this study is to provide valuable findings and guidelines for the design of submerging operations based on the case study of an unsuccessful submerging sea trial. A quasi-static time-domain simulation was conducted to investigate the unsuccessful trial and design a new flooding sequence. Based on the simulation results, the causes of the unsuccessful trial have been identified. Moreover, a new flooding sequence is proposed after examining various options. Since the vessel’s dimensions and ballast tank layout are typical and similar to many other heavy-lift barges, general conclusions for the design of submerging operations are summarized.

Uncertainty of Sea Trials Results Used for Validation of Ship Manoeuvring Simulation Models

2015 ◽  
Author(s):  
Sergey Gavrilin ◽  
Sverre Steen
Keyword(s):  
Simulation Model ◽  
Simulation Models ◽  
Full Scale ◽  
Experimental Uncertainty ◽  
Time Domain Simulation ◽  
Empirical Methods ◽  
Scaled Model ◽  
Monte Carlo Techniques ◽  
Ship Manoeuvring ◽  
Rudder Angle

Increasingly complex marine operations dictate higher need for precise and reliable modelling. For the last decades several different approaches to modelling of ship manoeuvring were developed, including scaled model testing, numerical and empirical methods. Increasingly, time-domain simulation models for ship manoeuvring are developed and used for training and planning of marine operations. Especially when using the simulation models to plan operations, it is essential that the simulation model is properly validated. There is a need for better and more standardized validation methods for such simulation models. A key issue is the uncertainty of the data used in the validation. Typically, the validation will be against full scale trials results. In the study reported in this paper it was found by inspection of repeated tests results that even under relatively calm environmental conditions outcomes of sea trials can be highly uncertain. However, it is very expensive to investigate uncertainty of each type of trial experimentally. Therefore it can be very beneficial to estimate it by means of a simulation model. This paper presents results of analysis of full scale turning circle trials of research vessel “Gunnerus”. Turning circle trials with 20° and 35° rudder angle executed both to starboard and port sides are analyzed. Experimental uncertainty analysis is performed. Effectiveness of IMO correction procedure is discussed. Also paper describes a method for determining uncertainty of trial results due to environmental effects by means of simulation model and compares them with experimental uncertainty. The method is based on Monte-Carlo techniques.

scholarly journals Development of a Simulation Model for Burden Distribution in Bell-less Charging Based on Full Scale Model Experiments

1985 ◽  
Vol 71 (2) ◽  
pp. 175-182 ◽  
Author(s):  
Yoshimasa KAJIWARA ◽  
Takao JIMBO ◽  
Tadatsugu JOKO ◽  
Yo-ichi AMINAGA ◽  
Takanobu INADA
Keyword(s):  
Simulation Model ◽  
Full Scale ◽  
Scale Model ◽  
Burden Distribution ◽  
Model Experiments

Design of Over Center Valves Based on Predictable Performance

2004 ◽  
Author(s):  
Michael R. Hansen ◽  
Torben Ole Andersen ◽  
Peder Pedersen ◽  
Finn Conrad
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Oscillatory Behavior ◽  
Parameter Study ◽  
Time Domain Simulation ◽  
Valve System ◽  
Instability Problem ◽  
Application Specific ◽  
Force Compensation

A typical over center valve system and a time domain simulation model is introduced together with a hypothesis that flow force compensation should reduce the inherent oscillatory behavior of such systems. A few results are shown from a parameter study that confirms this assumption and an approach to design over center valve geometries that have negative flow forces is presented with emphasis on predictability. In conclusion it is made clear that negative flow forces in the over center valve cannot solve the instability problem in general, however, it might very well be a method like lowering the pilot ratio, that can be used to application specific instability problems.

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.

Analysis of the Tunnel Immersion for the Busan-Geoje Fixed Link Project Through Scale Model Tests and Computer Simulations

2009 ◽  
Author(s):  
Hans Cozijn ◽  
Jin Wook Heo
Keyword(s):  
Simulation Model ◽  
Computer Simulations ◽  
Time Domain ◽  
Extreme Values ◽  
Sensitivity Study ◽  
Model Tests ◽  
Direct Access ◽  
Scale Model ◽  
Mooring System ◽  
Sea Bed

In Korea a four lane motorway is constructed between the city of Busan and the island Geoje, reducing traveling times from 1 hour by ferry to just 10 minutes by car. The so-called Busan-Geoje Fixed Link consists of 2 cable-stayed girder bridges and a tunnel, crossing the bay of Jinhae. The submerged tunnel is built by transporting each of its 18 elements below 2 pontoons from a construction dock to their final positions and lowering them on the sea bed. The project is unique, because the tunnel elements are installed in a bay with direct access towards open sea. For this reason, the effects of incoming swells and wind seas were investigated in detail, so that the operational limits of the tunnel element immersion could be accurately determined. This was achieved by using an approach of combined hydrodynamic scale model tests and time-domain computer simulations. First, scale model tests were carried out in MARIN’s Shallow Water Basin. A detailed test set-up was constructed, including the trench in which the tunnel elements are placed, as is shown in the photograph. Models of a tunnel element, two pontoons, the mooring system, contraction lines and suspension wires were constructed at a scale of 1:50. The motions of the pontoons and the submerged tunnel element, as well as the tensions in the lines, were measured in a range of different wave conditions. Different stages of the tunnel immersion were investigated. Second, a simulation model of the pontoons and tunnel element was constructed in MARIN’s time-domain simulation tool aNySIM. The large number of mooring lines, contraction lines and suspension wires resulted in a relatively complex numerical model. The simulation model was calibrated such that the results from the model tests could be accurately reproduced. Subsequently, a sensitivity study was carried out, investigating the parameters most critical to the operation and the mooring system of the pontoons was further optimized. Finally, the operational limits of the tunnel immersion were evaluated by carrying out more than 6,500 time-domain simulations, investigating a large number of different combinations of wind sea and swell. The simulation results included motions, velocities and accelerations, as well as line tensions. The extreme values were used to perform a combined evaluation of more than 10 structural and operational criteria. The photograph below (copyright Peter de Haas, Royal Haskoning) shows the immersion of the first of 18 tunnel elements in the bay of Jinhae, in February 2008.

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