Evaluation of Pipeline Stresses During Line Lowering

2008 ◽  
Author(s):  
Millan Sen ◽  
Joe Zhou
Keyword(s):  
Finite Element Analysis ◽  
Loading Condition ◽  
Analysis Program ◽  
Element Analysis ◽  
Environmental Loads ◽  
Right Of Way ◽  
The Finite Element Analysis ◽  
The Right ◽  
Maximum Stresses

The stresses induced to a pipe during line lowering are the maximum stresses that the pipeline will experience during its lifetime, in regions where there are no excessive environmental loads. During the installation of the TransCanada pipeline at Stittsville, Ontario, it was critical to limit the pipeline stresses that occurred during line lowering. This was required in order to fulfill the requirements of ECA-based flaw acceptance criteria applicable to mainline welding. However, the construction of the pipeline involved numerous challenges with regards to moving equipment during the pipeline installation, regions of deep cover requirements, and spatial restrictions on the right of way. These conditions introduced complicated loading scenarios, which made it difficult to ascertain the resulting stresses that the line lowering would apply to the pipeline. These stresses were evaluated herein using the finite element analysis program PIPLIN, with consideration of the actual in-situ installation conditions. Each loading condition was modeled individually, and the forces in the sidebooms were considered in addition to the pipeline stresses. It was determined that all the stresses in the pipeline during the line lowering were acceptable, so long as the specified boom locations remained within limits.

Strength Analysis and Structural Design Improvement of the Drill Floor of a Self-Elevating Drilling Unit

2015 ◽  
Author(s):  
Qi Wang ◽  
Ji Zeng ◽  
Yong Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Design ◽  
Structural Strength ◽  
Element Analysis ◽  
Environmental Loads ◽  
Design Improvement ◽  
The Finite Element Analysis ◽  
Floor Structure ◽  
Drilling Unit

The self-elevating drilling units are widely used in the offshore industry for oil and gas exploration. The drill floor structure is the main part of the drilling package for a self-elevating drilling unit due to its key function. Its structural strength checking is of great significance on account of the special structure features and the complex combined loading conditions it suffers. The sufficient structural strength of the drill floor is the base and guarantee for safe drilling and extraction. The finite element method was applied to calculate the structural strength of the drill floor directly considering different load cases which was the combination of environmental loads, permanent loads, variable function loads, and reaction forces from structures and equipments. Total forty load cases were set in the finite element analysis. A detailed finite element model without simplification of the drill floor was built correctly so that it can show the accurate stiffness of the real structure. Based on this model, the design method and the design criterion of the drill floor were described in detail. The environmental loads were calculated according to ABS MODU rules. The influence of the direction of the environmental loads on the drill floor were studied and concluded. Since the drill floor was not just welding with the cantilever beam, the boundary conditions were also particularly introduced owning to the complex connection between them. After finite element analysis and calculation, the stress distribution of the whole drill floor which includes the main girders and derrick supports were obtained. The locations with high stress were found so those places should be paid more attention. The curves which show the stress variation according to the environment loading direction were drawn and their characteristics were found. The load case and the load which have the main effect on drill floor structure were found. As a result, the suggestions for design improvement were put forward for the structural design, and the finite element analysis was run again to test and verify the design improvement. This paper can provide meaningful guidance for the future design of the drill floor.

Development and Application of the Finite Element Analysis Program of the Stress-Based Forming Limit Criterion for Sheet Metal Forming

2007 ◽  
Vol 561-565 ◽  
pp. 1995-1998
Author(s):  
Ming He Chen ◽  
J.H. Li ◽  
Lin Gao ◽  
Dun Wen Zuo ◽  
Min Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Forming Limit ◽  
Analysis Program ◽  
Element Analysis ◽  
The Finite Element Analysis

In order to solve the problem existed in the numerical simulation of sheet metal forming for its use the strain-based forming limit diagram as criterion, which has the flaw of dependence on the strain paths, this paper develops the finite element analysis program based on the stress forming limit criterion applicable to the blank plastic forming technique, which follows the stress-strain transformation relationship when the sheet metal is undergoing plastic deformation, chooses Hill’s quadratic normal anisotropic criterion as computational model and selects the commercial finite element code Dynaform as its development environment. Also it be analyzed the finite element numerical simulation results of two deep drawing parts by the developed program module and realizes the prediction of sheet metal forming limit adopting the FLSD as criterion. The stress-based forming limit criterion for the developed program provides a new means to analyze the forming limit for the multistage sheet metal forming.

Driving Characteristics of a Simple Square-Frame Ultrasonic Motor

2011 ◽  
Vol 110-116 ◽  
pp. 210-216
Author(s):  
J.W. Kim ◽  
C.H. Park ◽  
S.S. Jeong ◽  
M.H. Kim ◽  
T.G. Park ◽  
...  
Keyword(s):  
Elastic Body ◽  
Ultrasonic Motor ◽  
Resonance Mode ◽  
Optimal Size ◽  
Analysis Program ◽  
Bending Vibrations ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Right ◽  
Novel Design

A novel design of a simple square-frame USM (ultrasonic motor) was proposed. The stator of the motor consists of a square-frame shape elastic body and four rectangular plate ceramics. The four ceramics were attached to outer surfaces of the square-frame elastic body. The same phase voltages were applied to the ceramics on horizontal surfaces, and 90 degree phase difference voltages were applied to the ceramics on vertical surfaces. When the four outer edges of stator were clamped, the bending vibrations of the right angled bars were transformed into travelling vibrations and elliptical displacements were generated at the center of the bars. To find an optimal size of a stator, that generates elliptical displacement at the centers of the inner surfaces, the finite element analysis program ATILA was used. The analyzed results were compared to the experimental results. As result, the model EL10W3T0.5_CL7 which generates the maximum elliptical displacement was chosen by analyzing the resonance mode according to changes in frequency.

scholarly journals Vehicular Analysis of a Bridge Structure Considering IRC Loading Condition using Sap 2000

2021 ◽  
Author(s):  
Nikhil Kumar Singh ◽  
Jyoti Yadav
Keyword(s):  
Finite Element Analysis ◽  
Prestressed Concrete ◽  
Loading Condition ◽  
Bridge Structure ◽  
Tree Trunk ◽  
Element Analysis ◽  
Basic Plant ◽  
The Finite Element Analysis ◽  
Beam Bridge ◽  
Pressure Propagation

A beam bridge is a bridge that uses struts as a method of supporting the deck. A bridge consists of three sections: the foundation consisting of protrusions and supports and the substructure consisting of protrusions and quay and the superstructure (bracing, cantilever or curve) and the deck. A beam bridge is probably the most manufactured and used bridge on the planet. Its basic plant, at its best, can be likened to a tree trunk extending to one side to alternate across a stream or river. All decks consist of two main parts: the substructure and the superstructure. The superstructure is everything from the support cushions to - it's the thing that supports the posts and it's the most distinctive part of the deck. The substructure is the device that exchanges the poles of the superstructure on the ground. The two sections must work together to form a strong and durable bridge. Prestressed concrete is basically concrete where the internal concern is reasonable and the pressure propagation created by the external load is concentrated to the desired extent. In this research, we analyze a beam bridge with the effect of prestressed concrete and compare it to a generic deck bridge. Regarding the finite element analysis, the analysis of forces and costs. Here it is concluded that the implementation of a prestressed ceiling results in an economical, stable and load-resistant element.

Flexibility Analysis of the Welded Metal Bellows of Mechanical Seal

2011 ◽  
Vol 462-463 ◽  
pp. 894-899
Author(s):  
Mamtimin Gheni ◽  
Halida Musha ◽  
Nijiat Yusup ◽  
Kurban Baki
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Loading Condition ◽  
Maximum Stress ◽  
Mechanical Seal ◽  
Element Analysis ◽  
Flexibility Analysis ◽  
The Finite Element Analysis ◽  
Metal Bellows ◽  
The Relationship

In this study, the stiffness and the flexibility of welded metal bellows of mechanical seal is studied numerically by changing the number of bellows membrane and the loading condition. The relationship between the number of membrane and the displacement, the stress and the flexibility are analyzed. For further improved the axial displacement, overall stiffness and the flexibility of the welded metal bellows membrane, the finite element analysis are conducted. The numerical results show that the maximum stress keeps constant value with increasing the number of bellows membrane under the same loading condition. The relationship between number of bellows membrane and stiffness as will as the flexibility are obtained. It is shown, stiffness is decreased and flexibility is increased with increasing of the number of the bellows membrane.

Study on Composite Model for Vibro-Replacement Stone Column Foundation by Finite Element Method

2011 ◽  
Vol 117-119 ◽  
pp. 43-47
Author(s):  
Shao Jun Fu ◽  
Chuan Cheng Zhu ◽  
Zhen Ke Huang
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Reliability And Validity ◽  
Composite Model ◽  
Stone Column ◽  
Analysis Program ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Column Foundation

On the base of studying on mechanism of the deformation and bearing capacity of vibro-replacement stone column foundation thoroughly, the assumptive conditions are presented. The composite 2-dimension numerical model of the stone column is established, this model considers the couple of stress-strain with Biot consolidation and the reinforced efficiently, the finite element analysis program is developed according to this model. The reliability and validity of APOSE is verified by a simple example. The results show that APOSE can be applied to analyze the consolidation and subsiding for vibro-replacement stone column, etc

scholarly journals Analysis of a Replaceable Cutting Tooth of Bucket Chain Excavator

Mining Revue ◽  
2021 ◽  
Vol 27 (4) ◽  
pp. 28-32
Author(s):  
Zoltán Virág ◽  
Sándor Szirbik
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Lateral Force ◽  
Linear Increase ◽  
Cutting Process ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Detachable Joint ◽  
The Given ◽  
Maximum Stresses

Abstract This paper briefly outlines the design of replaceable cutting teeth of bucket chain excavator, which are attached to a holder with a detachable joint. The description of the rock cutting process is very complex, so the investigation of the effect of lateral forces is complicated through cutting tests. We use accordingly numerical analysis to examine some segments of the cutting process. Our main objective is to present the finite element analysis of cutting teeth in which the linear increase of the lateral force is taken into consideration. The finite element analysis is a powerful technique, which is enabled to compute the stress and displacement distribution in cutting teeth. The simulation results have shown that the maximum stresses decrease if the lateral force increases. The geometry of the optimized cutting teeth will be safe under the given loading conditions.

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