Vectoring Single Expansion Ramp Nozzle (VSERN) static model test program

1988 ◽  
Author(s):  
D. EAMES ◽  
M. MASON
Keyword(s):  
Model Test ◽  
Static Model ◽  
Test Program

Experimental Research on Special-Shaped CFST Arch Bridge Model

2011 ◽  
Vol 243-249 ◽  
pp. 1835-1841
Author(s):  
Da Peng Gu ◽  
Yan Jiang Chen ◽  
Wei Ming Yan ◽  
Yong Li
Keyword(s):  
Experimental Research ◽  
Model Test ◽  
Static Model ◽  
Bridge Engineering ◽  
Bridge Structure ◽  
Arch Bridge ◽  
Bridge Model ◽  
Cfst Arch Bridge ◽  
National Road ◽  
Main Bridge

The main bridge structure of the bridge engineering cross Yitong river, on the 102 national road, is a three-Span flying swallow type special-shaped CSFT arch bridge. This paper introduces the design, process and results of the static model test of the CFST arch bridge.

Improved Strake Design for Vortex Induced Motions of Spar Platforms

2005 ◽  
Author(s):  
Mehernosh Irani ◽  
Lyle Finn
Keyword(s):  
Model Test ◽  
Model Tests ◽  
Test Results ◽  
Test Program ◽  
Test Set ◽  
Test Methodology ◽  
Spar Platforms ◽  
Truss Spar ◽  
Set Up

An extensive model test program was conducted to explore the effectiveness of alternate strake designs to reduce Truss Spar VIV response. Different strake configurations were tested to minimize VIV response. The paper presents results of the model tests. The model test set-up is described, important parameters that are modeled (including hull and truss geometry, strake configuration, mass and mooring properties) and considerations of instrumentation and test methodology are discussed. The paper also describes the analysis of the test results and shows the effectiveness of new strake design. The present results are compared with VIV response of existing Truss Spars with conventional strake design.

Overview of the Ares I scale model test program

2011 ◽  
Vol 130 (4) ◽  
pp. 2542-2542
Author(s):  
Douglas D. Counter ◽  
Janice Houstion
Keyword(s):  
Model Test ◽  
Scale Model ◽  
Test Program ◽  
Ares I

An Experimental Study on Progressive and Dynamic Damage Stability Scenarios

2014 ◽  
Author(s):  
Oliver Lorkowski ◽  
Hendrik Dankowski ◽  
Florian Kluwe
Keyword(s):  
Experimental Study ◽  
Model Test ◽  
Static Model ◽  
Model Tests ◽  
Time Dependent ◽  
Test Series ◽  
Design Stage ◽  
Damage Scenarios ◽  
Damage Stability ◽  
Set Up

Current damage stability rules for ships are based on the evaluation of a ship’s residual stability in the final flooding stage. The consideration of the dynamic propagation of water within the inner subdivision as well as intermediate flooding stages and their influence on the resulting stability is very limited in the current damage stability regulations. The investigation of accidents like the one of the Estonia or the European Gateway reveals that intermediate stages of flooding and the dynamic flooding sequence result in significant fluid shifting moments which have a major influence on the time-dependent stability of damaged ships. Consequently, the critical intermediate stages should be considered when evaluating designs with large cargo decks like RoRo vessels, RoPax vessels and car carriers. Also the safety of large passenger ships with respect to damage stability is affected by the aforementioned effects. In this context a new numerical flooding simulation tool has been developed which allows an evaluation of a ship’s time-dependent damage stability including all intermediate stages of flooding. The simulation model is based on a quasi-static approach in the time domain with a hydraulic model for the fluxes to ease the computation and allow for fast and efficient evaluation within the early design stage of the vessel. This allows studying multiple damage scenarios within a short period. For the further validation of this numerical simulation method a series of model tests has been particularly set up to analyse the time-dependent damage stability of a floating body. The test-body has been designed specifically to reflect the most typical internal subdivision layouts of ships affected by the effects mentioned above. The experimental study covers a static model test series as well a dynamic one. The static model test series has been set up with the aim to analyse the progressive flooding of selected compartments in calm water. Within the dynamic model test series, the model is excited by a roll motion oscillator to evaluate the influence of the ship motion on the water propagation and the associated damage stability. The model tests presented in this paper comprise side leaks in typical compartments which are used for a basic validation of the simulation toll and the measurement devices. Particular attention has been drawn on damage scenarios with critical intermediate flooding stages in consequence of restricted water propagation. The presented results enable a further validation of the numerical flooding simulation and give an insight view on the chosen experimental setup.

Model Test Investigation of LNG Tandem Offloading With Dynamic Positioned Shuttle Tankers

2010 ◽  
Author(s):  
Jaap de Wilde ◽  
Jorrit-Jan Serraris ◽  
Erik-Jan de Ridder ◽  
Marie-Laure Be´cel ◽  
Jean-Robert Fournier
Keyword(s):  
Model Test ◽  
Kalman Filtering ◽  
Pid Control ◽  
Closed Loop ◽  
Direct Transfer ◽  
Extended Kalman Filtering ◽  
Test Program ◽  
Associated Gas ◽  
Test Investigation ◽  
Tandem Offloading

LNG FPSOs are being developed for production and processing of gas in remote offshore locations. The floating production unit is positioned over the reservoir and replaces the offshore platform, the pipeline to shore, the onshore LNG plant and the jetty. Alternatively, the LNG FPSO can be utilized to liquefy and export the associated gas, produced by one or several production units. Side-by-side offloading and stern-to-bow (tandem) offloading are the main options for the direct transfer of the cryogenic product from the FPSO to the LNG shuttle tanker. For stern-to-bow we can further distinguish between a hawser mooring (passive) or a dynamic positioned shuttle tanker (active). Experience suggests that the side-by-side operation is limited to relative benign metocean conditions, whereas a stern-to-bow arrangement allows for offloading in more severe sea states in which larger maneuverability area and large capacity mooring equipments are required. This paper discusses a first investigation of LNG stern-to-bow offloading with dynamic positioned shuttle tankers, based on a basin model test program. The shuttle tanker was controlled by a full closed loop DP system which is largely identical to real DP systems, including extended Kalman filtering, PID control and thruster allocation. The modeling of the azimuthing thrusters, rudder and main propeller is discussed in the paper, as well as the modeling of the relative position between the two ships. Some results of the model test program are presented.

Drilling Riser Model Test for Software Verification

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Decao Yin ◽  
Halvor Lie ◽  
Massimiliano Russo ◽  
Guttorm Grytøyr
Keyword(s):  
Model Test ◽  
Software Verification ◽  
Dynamic Responses ◽  
Wave Loads ◽  
Marine Riser ◽  
Test Program ◽  
Video Recordings ◽  
Severe Fatigue ◽  
Drilling Unit ◽  
Boundary Model

Marine drilling riser is subject to complicated environmental loads which include top motions due to mobile offshore drilling unit (MODU), wave loads, and current loads. Cyclic dynamic loads will cause severe fatigue accumulation along the drilling riser system, especially at the subsea wellhead (WH). Statoil and BP have carried out a comprehensive model test program on drilling riser in MARINTEK's Towing Tank in February 2015. The objective is to validate and verify software predictions of drilling riser behavior under various environmental conditions by the use of model test data. Six drilling riser configurations were tested, including different components such as upper flex joint (UFJ), tensioner, marine riser, lower marine riser package (LMRP), blow-out preventer (BOP), lower flex joint (LFJ), buoyancy elements, and seabed boundary model. The drilling riser models were tested in different load conditions. Measurements were made of microbending strains and accelerations along the riser in both in-line (IL) and crossflow (CF) directions. Video recordings were made both above and under water. In this paper, the test setup and test program are presented. Comparisons of results between model test and RIFLEX simulation are presented on selected cases. Preliminary results show that the drilling riser model tests are able to capture the typical dynamic responses observed from field measurement, and the comparison between model test and RIFLEX simulation is promising.

Some Aspects of Vortex Induced Motions of a Multi-Column Floater

2015 ◽  
Author(s):  
Mehernosh Irani ◽  
Tim Jennings ◽  
Jeff Geyer ◽  
Evan Krueger
Keyword(s):  
Model Test ◽  
Floating Platform ◽  
Test Program ◽  
Test Setup ◽  
Damping Characteristics ◽  
Test Methodology ◽  
Induced Motion ◽  
Set Up ◽  
Stiffness And Damping ◽  
First Time

An extensive model test program was conducted to explore the effect of various parameters on the Vortex Induced Motion (VIM) response of a four column semi-submersible (Semi) floating platform. The paper describes the model test set-up, important parameters that were modeled (including hull geometry, mass, stiffness and damping properties) and considerations of instrumentation and test methodology. The damping contributions from the moorings and risers have traditionally not been included in a VIM model test setup. This is the first time that the damping characteristics of the moorings and risers are systematically evaluated and included in the model test setup. This paper describes the calculation of the full-scale mooring and riser damping characteristics and, the design and construction of an innovative model test damping mechanism. Besides damping, the effect of varying the Semi draft and external hull appurtenances were also evaluated.

Results from a superconducting dipole model test program

1979 ◽  
Vol 15 (1) ◽  
pp. 143-144
Author(s):  
V. Vasiljev ◽  
L. Dinaburg ◽  
B. Zhukov ◽  
P. Kljavin ◽  
M. Kosjakin ◽  
...  
Keyword(s):  
Model Test ◽  
Dipole Model ◽  
Test Program
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