Dynamic analysis of three-dimensional marine cables

Huang, Shan

doi:10.1016/0029-8018(94)90008-6

Cited by 104 publications

(44 citation statements)

References 6 publications

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“…We distinguish between this and lumped parameter methods based on the starting point, which in this case is an infinitesimally small differential element and in the lumped parameter case is a finite discrete element. Given similar physical assumptions the two methods are entirely equivalent, as demonstrated by Huang [47]. The distinction between this and the lumped parameter approach is based largely on the applications of the method.…”

Section: Spatial Discretizationmentioning

confidence: 99%

The dynamics of geometrically compliant mooring systems

Gobat¹

2000

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Geometrically compliant mooring systems that change their shape to accommodate deformations are common in oceanographic and offshore energy production applications. Because of the inherent geometric nonlinearities, analyses of such systems typically require the use of a sophisticated numerical model. This thesis describes one such model and uses that model along with experimental results to develop simpler forms for understanding the dynamic response of geometrically compliant moorings.The numerical program combines the box method spatial discretization with the generalized-α method for temporal integration. Compared to other schemes commonly employed for the temporal integration of the cable dynamics equations, including box method, trapezoidal rule, backward differences, and Newmark's method, the generalized-α algorithm has the advantages of second-order accuracy, controllable numerical dissipation, and improved stability when applied to the nonlinear problem. The numerical program is validated using results from laboratory and field experiments.Field experiment and numerical results are used to develop a simple model for dynamic tension response to vertical motion in geometrically compliant moorings. As part of that development, the role of inertia, drag, and stiffness in the tension response are explored. For most moorings, the response is dominated by inertial and drag effects. The simple model uses just two terms to accurately capture these effects, including the coupling between inertia and drag. The separability of the responses to vertical and horizontal motions is demonstrated and a preliminary model for the response to horizontal motions is presented.The interaction of the mooring line with the sea floor in catenary moorings is considered. Using video and tension data from laboratory experiments, the tension shock condition at the touchdown point and its implications are observed for the first time. The lateral motion of line along the bottom associated with a shock during unloading may be a significant cause of chain wear in the touchdown region. Results from the laboratory experiments are also used to demonstrate the suitability of the elastic foundation approach to modeling sea floor interaction in numerical programs.

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Section: Spatial Discretizationmentioning

confidence: 99%

The dynamics of geometrically compliant mooring systems

Gobat¹

2000

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“…However, with the application of the composite materials and the development of the computer technology [6], more accurate simulation codes are called to consider the hydrodynamic forces and added mass effects. Lumped mass modeling is a favoured choice in the dynamic analysis of towed cables [7][8][9]. The cables are divided into finite elements, and an element frame is needed for each element to convert sustained forces with respect to the inertial frame.…”

Section: Introductionmentioning

confidence: 99%

Verification of a Numerical Simulation Code for Underwater Chain Mooring

Zhu

Yoo

2016

Archive of Mechanical Engineering

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Numerical simulation is an economical and effective method in the field of marine engineering. The dynamics of mooring cables has been analysed by a numerical simulation code that was created on a basis of a new element frame. This paper aims at verifying the accuracy of the numerical simulation code through comparisons with both the real experiments and a commercial simulation code. The real experiments are carried out with a catenary chain mooring in a water tank. The experimental results match the simulation results by the numerical simulation code well. Additionally, a virtual simulation of a large size chain mooring in ocean is carried out by both the numerical simulation code and a commercial simulation code. The simulation results by the numerical simulation code match those by the commercial simulation code well. Thus, the accuracy of the numerical simulation code for underwater chain mooring is verified by both the real experiments and commercial simulation code.

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“…To solve the vibration problem is the key issue for flexible system. So the research method for studying flexible system is quite import, the assumed mode method and finite element method are often used for theoretical model research [5][6][7]. Comprehensive studying of simulation and experiment can be helpful to the optimization of flexible system, and is beneficial to the simulation research of the control method.…”

Section: Dynamics Analysismentioning

confidence: 99%

“…Substituting the dynamic model into the Equation (4) (5) Define the control input function as (6) or (7) Equation (7) is control law of calculating torque.…”

Section: Inner Ring Control System Of Wdpmmentioning

confidence: 99%

Co-simulation of Six DOF Wire Driven Parallel Mechanism Based on ADAMS and Matlab

Tang

Yue

et al. 2015

MATEC Web of Conferences

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Abstract. The dynamic model of the 6 DOF Wire Driven Parallel Mechanism (WDPM) system is introduced. Based on MATLAB system, the simulation of the inverse dynamic model is achieved. According to the simulation result, the mechanical model for the WDPM system is reasonable. Using ADAMS system, the dynamic model of the virtual prototype is verified by the simulation analysis. The combined control model based on ADAMS/Simulink is derived. The WDPM control system is designed with MATLAB/Simulink. The torque control method is selected for the outer ring and the PD control method for the inner ring. Combined with the ADAMS control model and control law design, the interactive simulation analysis of the WDPM system is completed. According to the simulation results of the spatial circle tracking and line tracking at the end of the moving platform, the tracking error can be reduced by the designed control algorithm. The minimum tracking error is 0.2 mm to 0.3 mm. Therefore, the theoretical foundation for designing hardware systems of the WDPM control system is established.

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Dynamic analysis of three-dimensional marine cables

Cited by 104 publications

References 6 publications

The dynamics of geometrically compliant mooring systems

The dynamics of geometrically compliant mooring systems

Verification of a Numerical Simulation Code for Underwater Chain Mooring

Co-simulation of Six DOF Wire Driven Parallel Mechanism Based on ADAMS and Matlab

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