Installation and Pullout of Suction Caissons: Finite-Element Simulation

2003 ◽  
Author(s):  
Dilip R. Maniar ◽  
Luis F. G. Va´squez ◽  
John L. Tassoulas
Keyword(s):  
Finite Element ◽  
Clayey Soil ◽  
Axial Direction ◽  
Computational Procedure ◽  
Relative Displacement ◽  
Research Center ◽  
Technology Research ◽  
Element Mesh ◽  
Offshore Technology ◽  
Suction Caissons

This paper reports on the development of computational tools at the Offshore Technology Research Center to study the behavior of suction caissons also known as suction anchors and bucket foundations. The effects of installation on axial capacity are examined through simulation of caisson penetration into clayey soil by self-weight and suction. A frictional contact algorithm based on a slide-line formulation is used to analyze interaction between the caisson and the surrounding soil during installation. The contact formulation allows large relative displacement between the caisson and the soil. In addition, a remeshing tool eliminates the need for a priori specification of the caisson penetration path: as installation of the caisson progresses, the finite-element mesh is adjusted so that the line of nodes below the caisson tip remains straight in the axial direction. An overview of the computational procedure along with results obtained from simulation of caisson installation, reconsolidation of the soil-skeleton and caisson pullout is presented. The computational results are compared with measurements from laboratory tests also conducted at the Offshore Technology Research Center.

The Offshore Technology Research Center

1991 ◽  
Vol 10 (3) ◽  
pp. 33-35
Author(s):  
Richard A. Geyer
Keyword(s):  
Research Center ◽  
Technology Research ◽  
Offshore Technology

Assistive Technology Research Center

2001 ◽  
Author(s):  
John Toerge ◽  
Joseph Bleiberg ◽  
Michael Rose
Keyword(s):  
Assistive Technology ◽  
Research Center ◽  
Technology Research

scholarly journals Influence of finite element mesh size on the carrying capacity analysis of single-row ball slewing bearing

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110090
Author(s):  
Peiyu He ◽  
Qinrong Qian ◽  
Yun Wang ◽  
Hong Liu ◽  
Erkuo Guo ◽  
...  
Keyword(s):  
Finite Element ◽  
Carrying Capacity ◽  
Mesh Size ◽  
Finite Element Mesh ◽  
Fe Model ◽  
Element Mesh ◽  
Heavy Load ◽  
Slewing Bearing ◽  
Maximum Contact ◽  
Slewing Bearings

Slewing bearings are widely used in industry to provide rotary support and carry heavy load. The load-carrying capacity is one of the most important features of a slewing bearing, and needs to be calculated cautiously. This paper investigates the effect of mesh size on the finite element (FE) analysis of the carrying capacity of slewing bearings. A local finite element contact model of the slewing bearing is firstly established, and verified using Hertz contact theory. The optimal mesh size of finite element model under specified loads is determined by analyzing the maximum contact stress and the contact area. The overall FE model of the slewing bearing is established and strain tests were performed to verify the FE results. The effect of mesh size on the carrying capacity of the slewing bearing is investigated by analyzing the maximum contact load, deformation, and load distribution. This study of finite element mesh size verification provides an important guidance for the accuracy and efficiency of carrying capacity of slewing bearings.

scholarly journals Stator Non-Uniform Radial Ventilation Design Methodology for a 15 MW Turbo-Synchronous Generator Based on Single Ventilation Duct Subsystem

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2760
Author(s):  
Ruiye Li ◽  
Peng Cheng ◽  
Hai Lan ◽  
Weili Li ◽  
David Gerada ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Design Methodology ◽  
Large Scale ◽  
Synchronous Generator ◽  
Axial Direction ◽  
Scale Model ◽  
Element Analysis ◽  
Axial Temperature ◽  
Ventilation Duct

Within large turboalternators, the excessive local temperatures and spatially distributed temperature differences can accelerate the deterioration of electrical insulation as well as lead to deformation of components, which may cause major machine malfunctions. In order to homogenise the stator axial temperature distribution whilst reducing the maximum stator temperature, this paper presents a novel non-uniform radial ventilation ducts design methodology. To reduce the huge computational costs resulting from the large-scale model, the stator is decomposed into several single ventilation duct subsystems (SVDSs) along the axial direction, with each SVDS connected in series with the medium of the air gap flow rate. The calculation of electromagnetic and thermal performances within SVDS are completed by finite element method (FEM) and computational fluid dynamics (CFD), respectively. To improve the optimization efficiency, the radial basis function neural network (RBFNN) model is employed to approximate the finite element analysis, while the novel isometric sampling method (ISM) is designed to trade off the cost and accuracy of the process. It is found that the proposed methodology can provide optimal design schemes of SVDS with uniform axial temperature distribution, and the needed computation cost is markedly reduced. Finally, results based on a 15 MW turboalternator show that the peak temperature can be reduced by 7.3 ∘C (6.4%). The proposed methodology can be applied for the design and optimisation of electromagnetic-thermal coupling of other electrical machines with long axial dimensions.

Optimization of a finite element mesh for plates subjected to in-plane patch loading

2019 ◽  
Vol 33 (3) ◽  
pp. 1185-1193 ◽  
Author(s):  
Ghania Ikhenazen ◽  
Messaoud Saidani ◽  
Madina Kilardj
Keyword(s):  
Finite Element ◽  
Finite Element Mesh ◽  
Element Mesh ◽  
Patch Loading
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