Subsystem Design Analysis Lightweight Alternator (Model Test Program). Addendum 2.

1977 ◽  
Author(s):  
C. H. Lee ◽  
D. Berker ◽  
G. Tatro ◽  
P. Walia
Keyword(s):  
Model Test ◽  
Design Analysis ◽  
Test Program ◽  
Subsystem Design

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

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

Model Test of an Ice Class Bulk Carrier With the Thyssen/Waas Bow Form

1986 ◽  
Vol 108 (2) ◽  
pp. 168-172 ◽  
Author(s):  
A. Freitas ◽  
R. S. Nishizaki
Keyword(s):  
Northwest Territories ◽  
Model Test ◽  
Canadian Arctic ◽  
Scale Model ◽  
Test Results ◽  
Bulk Carrier ◽  
Test Program ◽  
Conventional Form ◽  
Ship Model ◽  
Transportation Development

Alternative bow forms have been investigated for the “M. V. Arctic” in a test program sponsored by the German Ministry for Research and Technology and the Transportation Development Centre of Transport Canada. The “M. V. Arctic” is a Canadian Arctic Class 2 bulk carrier of 28000 dwt which operates between the Northwest Territories and Europe during the summer and fall months. The tests were conducted at the Hamburg Ship Model Basin using a 1/30th scale model fitted with three different forebody forms. These included the Thyssen/Waas design, a new design by Melville Shipping Ltd., Calgary, and the existing bow form. The tests were performed in ice, still water and irregular seaway. The Thyssen/Waas icebreaker system includes a novel bow form and employs an unconventional icebreaking technique. The system has been successfully tested in model and demonstrated in full scale with the modified icebreaker “Max Waldeck”. The Melville design uses a conventional form incorporating the latest technology. This paper describes the model tests and discusses the relative performance as indicated by the test results. The investigation has shown the potential for the use of the Thyssen/Waas bow form on icebreaking cargoships such as the “M.V. Arctic”.

Model Test Program for MV St. Clair

1977 ◽  
Vol 14 (02) ◽  
pp. 139-157
Author(s):  
Peter A. Fisher
Keyword(s):  
Model Test ◽  
University Of Michigan ◽  
Test Program ◽  
Ship Hydrodynamics ◽  
Model Studies ◽  
Large Bulk ◽  
Bulk Carriers ◽  
Final Design ◽  
Areas Of Concern ◽  
The University

This paper provides a brief review of the model test program conducted by the Ship Hydrodynamics Laboratory of the University of Michigan on the MV St. Clair, Bay Shipbuilding Corporation, Hull 714. Due to some rather unique constraints imposed by Great Lakes operation, large bulk carriers have encountered unusual problems in the area of hydrodynamic design. Many of these areas of concern have been addressed through model studies. Specifically investigated were the effects on resistance, wake and flow patterns of various bow and stern variations. Results of those tests including self-propulsion of the final design are included herein..

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