Semicontinuous Mathematical Model for Bending of Multilayered Wire Strands

Jolicoeur, Claude; Cardou, A.

doi:10.1061/(asce)0733-9399(1996)122:7(643)

Cited by 42 publications

(12 citation statements)

References 18 publications

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“…where m = n i=0 m i , m i is defined by (28), gm is the force counterbalancing the weight of the riser and internal fluid in the sea. Table 5 presents values of the first two frequencies of free vibrations of the riser analysed.…”

Section: Frequencies Of Free Vibrations With Consideration Of Internamentioning

confidence: 99%

“…The first group consists of thin-rod models, initially without bending and torsional flexibilities [23,24], which finally have been included [25,26] by modelling individual wires as thin rods. Semi-continuous models [27][28][29], in which each layer of a twisted wire is modelled as an orthotropic cylinder, form the second group of models. The third includes beam models [30][31][32], in which solid beam theory is used in order to formulate the equilibrium equations.…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of the segment method in absolute and joint coordinates when modelling risers

2019

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This paper presents two formulations of the segment method: one with absolute coordinates and the second with joint coordinates. The nonlinear equations of motion of slender links are derived from the Lagrange equations by means of the methods used in multibody systems. Values of forces and moments acting in the connections between the segments are defined using a new and unique procedure which enables the mutual interaction of bending and torsion to be considered. The models take into account the influence of the velocity of the internal fluid flow on the riser's dynamics. The dynamic analysis of a riser with fluid flow requires calculation of the curvature by approximation of the Euler angles with polynomials of the second order. The influence of the sea environment, such as added mass of water, drag and buoyancy forces as well as sea current, is considered. In addition, the influence of torsion is discussed. Validation is carried out for both models by comparing the authors' own results with those obtained from experimental measurements presented in the literature and from COMSOL, Riflex and Abaqus software. The validation is concerned with vibrations of cables and the riser with internal fluid flow as well as with frequencies of free and forced vibrations of a riser fully or partially submerged in water. The numerical effectiveness of both formulations is examined for dynamic analysis of the riser, whose top end is moving in a horizontal plane. Conclusions concerned with the effectiveness of both formulations of the segment method and the influence of torsional vibrations on numerical results are formulated.

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Section: Frequencies Of Free Vibrations With Consideration Of Internamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effectiveness of the segment method in absolute and joint coordinates when modelling risers

2019

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“…In order to use the foregoing theory, we have to specify the physical characteristics of the wire rope and we have to estimate the elastic constants. Methods for doing this have been described by Jolicoeur and Cardou ͓14,15͔ in their analysis of the static loading of wire rope. We follow their method closely, making use of some calculations of Costello ͓͑4͔, Section 3.9͒.…”

Section: A Simple Example Of An Aluminum Conductor Steel Reinforced "mentioning

confidence: 99%

On Mechanical Waves Along Aluminum Conductor Steel Reinforced (ACSR) Power Lines

Martin

Berger

2002

Journal of Applied Mechanics

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The propagation of elastic waves along composite wire rope is considered. The rope is modeled as co-axial layers of cylindrically anisotropic material. Simple kinematical assumptions lead to a “rod theory” for the wire rope, consisting of three coupled one-dimensional wave equations. Solutions of these equations are found. Results for a particular aluminum conductor steel reinforced (ACSR) conductor are described in detail. The slowest mode is found to be mainly torsional and mainly nondispersive in character. The other two modes are dispersive and have small torsional components.

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“…The characterization of the resulting mechanical stresses, S a , from the vibration process is challenging to measure and model analytically or numerically (due to the complexities involved in inner conductor mechanics, such as plasticity, variable flexural stiffness and wear due to the partial slip contact regime) [37,38]. For this reason, the estimation of the S-N curve is based on the execution of a set of experimental tests that seek to characterize the fatigue behavior of the cable-clamp connection.…”

Section: Introductionmentioning

confidence: 99%

Development of controlled heating for fatigue test in overhead conductors at high temperature

Costa

Araújo

Veloso

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The objective of this work was to evaluate the influence of elevated temperature on the fatigue resistance of an all aluminum conductor. A dispositive was developed to reach temperatures like those undergone by high-voltage electrical conductors during their useful life. This dispositive is based on the classical temperature control of proportional integral derivative. In this work, the dispositive used for heating the conductor/suspension clamp assembly and the methodology used to execute fatigue tests at 75 °C of one "All Aluminum Conductor" (Orchid) were presented in detail. There is a remarkable and sensible difference between S and N curves for tests carried out at room temperature and those accomplished at 75 °C, which may indicate degradation of all aluminum conductors when tested under fatigue conditions at higher temperatures.

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Semicontinuous Mathematical Model for Bending of Multilayered Wire Strands

Cited by 42 publications

References 18 publications

Effectiveness of the segment method in absolute and joint coordinates when modelling risers

Effectiveness of the segment method in absolute and joint coordinates when modelling risers

On Mechanical Waves Along Aluminum Conductor Steel Reinforced (ACSR) Power Lines

Development of controlled heating for fatigue test in overhead conductors at high temperature

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