Dynamic coupling analysis for the design of hybrid mooring lines of truss spar in deep sea

2017 ◽  
Vol 28 (4) ◽  
pp. 317
Author(s):  
Longting Wang ◽  
Yanzhe Wang ◽  
Wencong Qian ◽  
Guangdou Liu ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Deep Sea ◽  
Dynamic Coupling ◽  
Coupling Analysis ◽  
Mooring Lines ◽  
Truss Spar

Dynamic coupling analysis for the design of hybrid mooring lines of truss spar in deep sea

2017 ◽  
Vol 28 (4) ◽  
pp. 317
Author(s):  
Yanzhe Wang ◽  
Xingping Xu ◽  
Hai Wang ◽  
Wencong Qian ◽  
Guangdou Liu ◽  
...  
Keyword(s):  
Deep Sea ◽  
Dynamic Coupling ◽  
Coupling Analysis ◽  
Mooring Lines ◽  
Truss Spar

scholarly journals Seakeeping Tests of a FOWT in Wind and Waves: An Analysis of Dynamic Coupling Effects and Their Impact on the Predictions of Pitch Motion Response

2021 ◽  
Vol 9 (2) ◽  
pp. 179
Author(s):  
Giovanni Amaral ◽  
Pedro Mello ◽  
Lucas do Carmo ◽  
Izabela Alberto ◽  
Edgard Malta ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Dynamic Coupling ◽  
Coupling Effects ◽  
Mooring Lines ◽  
Scaled Model ◽  
Wave Basin ◽  
Domain Models ◽  
Catenary System

The present work highlights some of the dynamic couplings observed in a series of tests performed in a wave basin with a scaled-model of a Floating Offshore Wind Turbine (FOWT) with semi-submersible substructure. The model was moored by means of a conventional chain catenary system and an actively controlled fan was used for emulating the thrust loads during the tests. A set of wave tests was performed for concomitant effects of not aligned wave and wind. The experimental measurements illustrate the main coupling effects involved and how they affect the FOWT motions in waves, especially when the floater presents a non-negligible tilt angle. In addition, a frequency domain numerical analysis was performed in order to evaluate its ability to capture these effects properly. The influence of different modes of fan response, floater trim angles (changeable with ballast compensation) and variations in the mooring stiffness with the offsets were investigated in the analysis. Results attest that significant changes in the FOWT responses may indeed arise from coupling effects, thus indicating that caution must be taken when simplifying the hydrodynamic frequency-domain models often used as a basis for the simulation of FOWTs in waves and in optimization procedures for the design of the floater and mooring lines.

DYNAMIC COUPLING ANALYSIS BETWEEN FRONT AND REAR AXLE FOR ABS SYSTEMS DESIGN

2007 ◽  
Vol 40 (10) ◽  
pp. 375-382
Author(s):  
Mara Tanelli ◽  
Sergio M. Savaresi ◽  
Alessandro Mergenthaler
Keyword(s):  
Rear Axle ◽  
Systems Design ◽  
Dynamic Coupling ◽  
Coupling Analysis

Research on Collision Mechanism for a Ship Colliding With a Spar Platform

2007 ◽  
Author(s):  
Zhiqiang Hu ◽  
Weicheng Cui ◽  
Longfei Xiao ◽  
Jianmin Yang
Keyword(s):  
Numerical Simulation ◽  
Structural Damage ◽  
Simulation Method ◽  
Hydrodynamic Characteristics ◽  
Spar Platform ◽  
Mooring Lines ◽  
Hull Design ◽  
Truss Spar ◽  
Internal Mechanism ◽  
Double Hull

The collision mechanisms of spar platform haven’t caused so much attention as that of ships in the past, for the short of this kind of collision accidents reported. But this does not mean the impossibility of the collision accident in the future. The research on external mechanism and internal mechanism for a ship colliding with a spar platform is introduced in this paper. A model test is designed to study the external mechanism. The collision scenario is described as a ship colliding with a spar platform moored in 1500 meters water depth. The specifics of the spar’s motions and the tension forces of the mooring lines are gathered, to find the hydrodynamic characteristics in the collision scenario. It is found that the maximal displacements and the maximal pitch angles of the spar platform, and the maximal tension forces of mooring lines are all linearly proportional to the initial velocity of the striking ship basically. Mooring lines play elastic roles in the collision course. The internal mechanism of the ship colliding with the spar platform is achieved by numerical simulation method and the software used is MSC.DYTRAN. A Truss-Spar is taken as the object and a double hull structural design is adopted in the part of hard tank near water surface. The curves of collision characters and the structural damage are obtained. The crashworthiness of the double hull design is verified, through the numerical simulation results.

Experimental Study of Mechanical Properties of Fiber of Deep-Sea Mooring Cables

2011 ◽  
Vol 130-134 ◽  
pp. 1712-1715
Author(s):  
Gai Li Zhou ◽  
Linan Li ◽  
Shui Jiao Li ◽  
Shi Bin Wang
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Deep Sea ◽  
Performance Test ◽  
Breaking Strength ◽  
Fiber Strength ◽  
Experimental Studies ◽  
Strength Properties ◽  
Mooring Lines ◽  
Strength Performance

In order to learn the mechanical properties of deep-sea mooring lines, experimental studies involved in strength properties have been carried out in this thesis. In the fiber strength performance test, the small force-large deformation experimental device has been designed and optimized. As the fiber diameter is very small (about 40μm), microscope is chosen to measure the diameter. The intensity curve of fiber is divided into three typical phases. The yield strength, breaking strength and elastic modulus in initial stage can be calculated and the elastic modulus is basically a constant. With the increasing of loading rate, the breaking force reduces and gradually tends to stabilize. It has got the formula, breaking strength ∝.

Stochastic Analysis to Truss Spar Platform in Deep Sea

2013 ◽  
Vol 477-478 ◽  
pp. 809-812
Author(s):  
Yan Wang ◽  
Rui Gao ◽  
Ling Qiang Yang
Keyword(s):  
Numerical Method ◽  
Deep Sea ◽  
Stochastic Analysis ◽  
Numerical Results ◽  
Model Parameters ◽  
Regular Waves ◽  
Spar Platform ◽  
Truss Spar Platform ◽  
Wave Basin ◽  
Truss Spar

Truss spar model was tested using regular waves in a wave basin and the responses in surge, heave and pitch were measured. A program was developed to determine the responses using numerical method. This program was run using the model parameters. The results are agreed well with the corresponding results obtained from the test measurements. Then this program was applied to a prototype spar simulated results were compared with the corresponding numerical results and test measurements.

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