Experimental Investigations Into the Influences of SCRs and Appurtenances on Deepdraft Semisubmersible Vortex Induced Motion Response

2011 ◽  
Author(s):  
Oriol Rijken ◽  
Sipke Schuurmans ◽  
Steve Leverette
Keyword(s):  
Experimental Study ◽  
Model Test ◽  
Experimental Results ◽  
Experimental Investigations ◽  
Mooring System ◽  
Motion Response ◽  
Test Conditions ◽  
Induced Motion ◽  
Scr System ◽  
Design Guidance

Vortex Induced Motion (VIM) response of a deep draft semisubmersible with square columns has been observed various model test conditions and in the field. A good understanding of the VIM phenomenon is desired because VIM can lead to significant SCR fatigue, especially for the larger diameters SCRs. A VIM design guidance was developed from several previous experimental investigations. Those experimental investigations are characterized by hulls with limited detail, and a simplified mooring / SCR system where typically only the stiffness is taken into consideration. A comparative experimental study is performed to identify the differences in VIM response under the absence and presence of hull appurtenances. Further, the VIM responses of a semisubmersible restrained by a mooring system without and with an SCR system are compared. An evaluation of the experimental results leads to an improved understanding of the VIM response at model test scale.

Experimental Study Into Vortex Induced Motion Response of Semi Submersibles With Square Columns

2008 ◽  
Author(s):  
Oriol Rijken ◽  
Steven Leverette
Keyword(s):  
Experimental Study ◽  
Reynolds Number ◽  
Mooring System ◽  
Test Program ◽  
Sea State ◽  
Response Characteristics ◽  
Test Conditions ◽  
Induced Motion ◽  
Four Square ◽  
Model Programs

Vortex Induced Motion (VIM) of a Deep Draft Semi® with four square columns has been observed in model tests and in a prototype configuration. The flow field around the columns causes the vessel to oscillate along one of the vessel’s main diagonals under particular conditions. The observations and conclusions of three series of VIM model programs are combined in this report. Each test program was executed with a unique objective in mind and each setup was unique. Many similarities in response characteristics have been identified. Some of the differences in observed response are identified and discussed. A discussion is provided regarding the scaling of VIM problems, and the importance of the Reynolds number under model test conditions is discussed. The VIM of a typical Gulf of Mexico Deep Draft Semi® may affect the fatigue life of the mooring system and risers. A formulation is developed that predicts the distribution of VIM amplitudes which then can be used to estimate VIM induced fatigue damage. Observations and conclusions are provided of several experiments where VIM response was evaluated in the presence of a fatigue sea state and for a system with increased sway damping.

Experimental Study on Vortex-Induced Motions (VIM) of a Large-Volume Semi-Submersible Platform

2011 ◽  
Author(s):  
Rodolfo T. Gonc¸alves ◽  
Guilherme F. Rosetti ◽  
Andre´ L. C. Fujarra ◽  
Kazuo Nishimoto ◽  
Allan C. Oliveira
Keyword(s):  
Experimental Study ◽  
Model Test ◽  
Large Volume ◽  
Cross Flow ◽  
Induced Motion ◽  
Line Cross

A great deal of work has been developed on the spar and monocolumn vortex-induced motion (VIM) issue. However, there are very few published works concerning VIM of semi-submersible platforms, partly due to the fact that VIM studies for this type of platform recently became interesting particularly due to the increasing semi-submersible dimensions (columns diameter and height. In this context, a meticulous experimental study on VIM for this type of platform concept is presented here. Model test experiments were performed to check the influence of many factors on VIM, such as different headings and hull appendages. The results comply with in-line, cross-flow and yaw motion amplitudes, as well as with combined motions in the XY plane.

Experimental Study on Elastic Modulus of a Steel-Plastic Composite Pipe

2011 ◽  
Vol 204-210 ◽  
pp. 1579-1583
Author(s):  
Fei Wang ◽  
Guan Long Yan ◽  
Guo Wei Wang
Keyword(s):  
Experimental Study ◽  
Elastic Modulus ◽  
Excellent Agreement ◽  
Experimental Results ◽  
Basic Data ◽  
Experimental Investigations ◽  
Plastic Composite ◽  
Composite Pipe ◽  
Pipeline Design

A pit experimental investigations on elastic modulus of the dn160 steel-plastic composite pipe are carried out in the paper. The experimental results show that the elastic modulus of steel-plastic composite pipe is 10.93 GPa. In order to verify the pit experimental, buried-heating experiments are conducted. It was found that the deviation is within 6%. The excellent agreement indicated that the elastic modulus data by pit experiment are reliable and can be used as basic data for directly buried heating pipeline design.

Field Measurements of Vortex Induced Motions of a Deep Draft Semisubmersible

2009 ◽  
Author(s):  
Oriol Rijken ◽  
Steve Leverette
Keyword(s):  
Model Test ◽  
Quantitative Description ◽  
Field Measurements ◽  
Model Tests ◽  
Field Observations ◽  
Test Results ◽  
Induced Motion ◽  
Four Square ◽  
Design Guidance

Vortex Induced Motion (VIM) of a Deep Draft Semi® with four square columns has been observed in model tests and in the field for a prototype configuration. The model test observations were developed into design guidance procedures. Some of the assumptions based on the model test results are validated with the field observations. A quantitative description of the field measurements is presented. A comparison between the field observations and the design guidance is provided.

scholarly journals Determination of hydraulic conductivity for granular filters based on constriction size and shape parameters

2021 ◽  
Author(s):  
Nasir Ahmad Rather ◽  
Mohd Akbar Lone ◽  
Abdul Qayoom Dar ◽  
Mir Bintul Huda
Keyword(s):  
Experimental Study ◽  
Hydraulic Conductivity ◽  
Empirical Model ◽  
Filter Material ◽  
Experimental Results ◽  
Experimental Investigations ◽  
Shape Parameters ◽  
Granular Filter ◽  
Granular Filters

Abstract This experimental study is an attempt to apply the constriction size concept for determination of hydraulic conductivity of filter material. Five shapes of granular filter material having varying gradations were used for the experimental investigations. The controlling constriction size of selected shapes having varying gradations were worked out and related to the experimental results of hydraulic conductivity. The empirical model for hydraulic conductivity determination based on controlling constriction size for each selected shape of granular filter material was developed. Finally, a combined empirical model for the determination of hydraulic conductivity of granular filters was developed based on shape parameters and the controlling constriction size.

scholarly journals Experimental study of the $ \gamma p \rightarrow K^{0}\Sigma^{+}$, $ \gamma n \rightarrow K^{0} \Lambda$, and $ \gamma n \rightarrow K^{0} \Sigma^{0}$ reactions at the Mainz Microtron

2019 ◽  
Vol 55 (11) ◽  
Author(s):  
C. S. Akondi ◽  
K. Bantawa ◽  
D. M. Manley ◽  
S. Abt ◽  
P. Achenbach ◽  
...  
Keyword(s):  
Experimental Study ◽  
Cross Sections ◽  
Differential Cross ◽  
Legendre Polynomials ◽  
Neutral Kaon ◽  
Experimental Results ◽  
Differential Cross Sections ◽  
Theoretical Predictions ◽  
Photoproduction Reactions ◽  
Insight Into

Abstract.This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma^+$γp→K0Σ+, $ \gamma n\rightarrow K^0\Lambda$γn→K0Λ, and $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 reactions. Our results for $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 are the first-ever measurements for that reaction. These data will provide insight into the properties of $ N^{\ast}$N* resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $ \pi N$πN channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.

scholarly journals Numerical and experimental study of the dynamic factor of the dynamic load on the urban railway

2020 ◽  
Vol 29 (1) ◽  
pp. 195-202
Author(s):  
Tran Anh Dung ◽  
Mai Van Tham ◽  
Do Xuan Quy ◽  
Tran The Truyen ◽  
Pham Van Ky ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dynamic Load ◽  
Dynamic Measurement ◽  
Experimental Results ◽  
Load Factor ◽  
Dynamic Factor ◽  
Experimental Measurements ◽  
Train Speed ◽  
Dynamic Load Factor

AbstractThis paper presents simulation calculations and experimental measurements to determine the dynamic load factor (DLF) of train on the urban railway in Vietnam. Simulation calculations are performed by SIMPACK software. Dynamic measurement experiments were conducted on Cat Linh – Ha Dong line. The simulation and experimental results provide the DLF values with the largest difference of 2.46% when the train speed varies from 0 km/h to 80 km/h

Experimental Study of a Tanker Ship Squat in Shallow Water

2014 ◽  
Vol 66 (2) ◽  
Author(s):  
Mohammadreza Fathi Kazerooni ◽  
Mohammad Saeed Seif
Keyword(s):  
Experimental Study ◽  
Shallow Water ◽  
Experimental Approach ◽  
Model Tests ◽  
Ship Hull ◽  
Experimental Results ◽  
Shallow Waters ◽  
Towing Tank ◽  
Ship Model

One of the phenomena restricting the tanker navigation in shallow waters is reduction of under keel clearance in the terms of sinkage and dynamic trim that is called squatting. According to the complexity of flow around ship hull, one of the best methods to predict the ship squat is experimental approach based on model tests in the towing tank. In this study model tests for tanker ship model had been held in the towing tank and squat of the model are measured and analyzed. Based on experimental results suitable formulae for prediction of these types of ship squat in fairways are obtained.

Experimental Study on the Optimal Thickness of Infiltration Media of the CRI System

2011 ◽  
Vol 415-417 ◽  
pp. 1703-1707
Author(s):  
Jun Min Chen ◽  
Xiao Lin Yao
Keyword(s):  
Experimental Study ◽  
Removal Efficiency ◽  
Significant Influence ◽  
Soil Column ◽  
Experimental Results ◽  
Artificial Soil ◽  
Optimal Thickness ◽  
Effluent Quality ◽  
Anaerobic Zone

Abstract. In order to investigate the optimal thickness of infiltration media in the Constructed Rapid Infiltration System, the artificial soil column is used to simulate the Constructed Rapid Infiltration System, and the CODCr, NH3-N and TN concentrations of the effluent from all the sampling sites are monitored. The experimental results and analysis show that the thickness of infiltration media exerts a significant influence on the CODCr, NH3-N and TN concentration and removal efficiency of the effluent; the CODCr, NH3-N and TN are mainly removed in the 0-1800mm zone of the artificial soil column; the total CODCr removal efficiency increases, as the thickness of infiltration media increases, but the CODCr removal efficiency in the 1800-2200mm zone is very low; the NH3-N and TN removal efficiency reaches the maximum where the thickness of infiltration media is 1800mm; the NH3-N and TN concentration of the effluent from 1800-2200mm zone dose not decrease, but increase 5-8%, due to the assimilation denitrification and amemoniation reaction on the end of the anaerobic zone; in consideration of the effluent quality, efficient biodegradation zone, construction investment, etc. the optimal thickness of infiltration media in CRI system should be 1800mm.

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