3D numerical analysis and test results of a short-primary linear reluctance motor

2007 ◽  
Vol 161 (1) ◽  
pp. 58-65 ◽  
Author(s):  
Kokichi Ogawa ◽  
Tsuyoshi Higuchi
Keyword(s):  
Numerical Analysis ◽  
Test Results ◽  
Reluctance Motor

Experimental and Numerical Study on Dynamic Response of FSRU-LNGC Side-by-Side Mooring System

2019 ◽  
Author(s):  
Jingxia Yue ◽  
Weili Kang ◽  
Wengang Mao ◽  
Pengfei Chen ◽  
Xi Wang
Keyword(s):  
Numerical Analysis ◽  
Dynamic Response ◽  
Numerical Study ◽  
Clean Energy ◽  
Coupled Analysis ◽  
Response Analysis ◽  
Mooring System ◽  
Test Results ◽  
Floating Bodies ◽  
Damping Parameter

Abstract Floating Storage and Regasification Unit (FSRU) becomes one of the most popular equipment in the industry for providing clean energy due to its technical, economic and environmental features. Under the combined loads from wind, wave and current, it is difficult for the prediction of the dynamic response for such FSRU-LNGC (Liquified Natural Gas Carrier) side-by-side mooring system, because of the complicated hydrodynamic interaction between the two floating bodies. In this paper, a non-dimensional damping parameter of the two floating bodies is obtained from a scaled model test. Then the numerical analysis is carried out based on the test results, and the damping lid method is applied to simulate the hydrodynamic interference between floating bodies. The dynamic response of the side-by-side mooring system including six degrees of freedom motion, cable tension and fender force are provided and analyzed. According to the comparisons between numerical results and the test results, it is shown that the proposed coupled analysis model is reliable, and the numerical analysis can properly describe the dynamic response of the multi-floating mooring system in the marine environment. Moreover, the non-dimensional damping parameter which is used in numerical analysis can act as a good reference to the dynamic response analysis of similar multi-floating mooring systems.

Comparison of Numerical Results With Experiments on the Ultimate Strength of Long Stiffened Panels

2011 ◽  
Author(s):  
Mingcai Xu ◽  
C. Guedes Soares
Keyword(s):  
Numerical Analysis ◽  
Test Results ◽  
Buckling Mode ◽  
Geometric Imperfections ◽  
Geometric Nonlinearities ◽  
Stiffened Panels ◽  
Initial Imperfections ◽  
Linear Buckling ◽  
Initial Geometric Imperfections ◽  
Collapse Behavior

The behavior of long stiffened panels are simulated numerically and compared with test results of axial compression until collapse, to investigate the influence of the stiffener’s geometry. The material and geometric nonlinearities are considered in the simulation. The initial geometric imperfections, which affect the collapse behavior of stiffened panels, are also analyzed. The initial imperfections are assumed to have the shape of the linear buckling mode. Four types of stiffeners are made of mild or high tensile steel for bar stiffeners and mild steel for ‘L’ and ‘U’ stiffeners. To produce adequate boundary conditions at the loaded edges, three bays stiffened panels were used in the tests and in the numerical analysis.

Simulation and Numerical Analysis on Anti-Float Anchor by Field Rock and Soil Tests

2014 ◽  
Vol 686 ◽  
pp. 671-675
Author(s):  
Xiang Ling Zhou
Keyword(s):  
Numerical Analysis ◽  
Axial Force ◽  
Field Testing ◽  
Internal Force ◽  
Effective Length ◽  
Test Results ◽  
Future Design ◽  
Anchor Group ◽  
Stress And Deformation ◽  
Rock And Soil

This paper introduces the stress and deformation of anti floating anchor rod and explained the damage. Through field testing and numerical analysis, the article were studied the displacement and internal force of a basement tensile anti float anchor, results showed that: the axial force of bolt tension transfer is top-down transfer, axial force decreases, the stress concentrate on the end. When a force is applied to a certain load, end firstly generate damage, but with the deepening of the axial force, it is greatly reduced, which indicates that the anchor force is an effective length, rather than the longer the anchor pullout force is bigger; anchor group effect is a problem that can not be ignored, because the engineering community for its attention degree is not enough, so that the design of anti floating anchor the lack of a reliable basis, the test results can provide a reference for the future design of anti floating anchor. Prestressed anchors in the tension lock, prestressed loss are regularly.

Overdamped slug test in monitoring wells: review of interpretation methods with mathematical, physical, and numerical analysis of storativity influence

1998 ◽  
Vol 35 (5) ◽  
pp. 697-719 ◽  
Author(s):  
Robert P Chapuis
Keyword(s):  
Numerical Analysis ◽  
Classical Solution ◽  
Heat Conduction Problem ◽  
Solid Matrix ◽  
Test Results ◽  
Slug Test ◽  
Slug Tests ◽  
Monitoring Wells ◽  
Pulse Test ◽  
Negligible Influence

Several methods are available to interpret slug tests; however, when applied to the same test data, they usually yield very different results. The methods are classified into three categories depending on their assumptions about the solid matrix deformability during the test. This paper deals with overdamped tests for elastic solids that deform instantaneously. It provides a unified interpretation of transmissivity T and storativity S based on the velocity graph for variable-head tests in monitoring wells or cased boreholes. If S has little influence, the velocity graph is a straight line. If S has some influence, the graph should give a smooth curve. However, smooth curves are exceptions in practice, thereby leading to a reexamination of the influence of S during a slug test. Three independent approaches are used. (1) A mathematical review shows that the overdamped solution, as adapted from a heat conduction problem, did not correctly treat storativity terms and the type of problem: it corresponds to a special pulse test, not a slug test. (2) A physical investigation of deformability shows that the influence of S does not exceed 1% of the initial slug for most compressible materials. Thus, it is almost impossible to detect its influence in test results. (3) Numerical analyses confirm that S has a negligible influence: test results provide straight lines, not curves. The numerical analysis of the special pulse test provides exactly the classical solution, and the correct values of T and S after eliminating the confusion about storativity terms. It is concluded that (1) S has a negligible influence in slug tests, (2) the existing classical solution giving T and S must be abandoned, and (3) the velocity-graph equation and its integral equation (Hvorslev or Bouwer and Rice) which correctly describe the process must be used.Key words: slug test, hydraulic conductivity, storativity, numerical modeling.

Numerical Analysis of the Rural Building due to Flood Impact

2011 ◽  
Vol 255-260 ◽  
pp. 1857-1861 ◽  
Author(s):  
Shi Yun Xiao ◽  
Yun Fei Sun
Keyword(s):  
Numerical Analysis ◽  
Impact Loading ◽  
Failure Process ◽  
Test Results ◽  
Rural Buildings ◽  
Brick And Mortar ◽  
Flood Impact ◽  
Mortar Element ◽  
The Right

The impacting action of flood destroyed dramatically the rural buildings. In this paper, the rural building was analyzed numerically to investigate the destruction of rural building due to the flood impact. The rural building was discretized into 7950 8-node block elements and 4098 Goodman elements to simulate the brick and mortar respectively. The rule impact loading of flood on rural building was calculated using the criterion of gravity similarity according to test results. Finally, the stress, the displacement and the failure process of the rural building are studied. Firstly, the mortar element locates on the wall between the door and the window failure and more and more mortar and brick elements failure with the increasing loading. Finally, the right wall was damaged because the door and the right window decreased its stiffness. Because the failure mortar and brick elements decrease the stiffness of the structure, the displacements of the rural building increased nonlinearly with the increasing loading.

NUMERICAL ANALYSIS OF FENCE TYPE SUPPORT OF APPLE TREES

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Il-Min Kang ◽  
Kyung-Jae Shin ◽  
Young-Ju Lee ◽  
Yu-Hyun Lee ◽  
Hyu-Min Shin ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Wind Speed ◽  
Apple Tree ◽  
Wind Tunnel Test ◽  
Test Results ◽  
Analysis Model ◽  
Apple Trees ◽  
Standard Type ◽  
Set Up ◽  
Test Result

Damages to apple trees caused by typhoons have been repeated every year in Korea. Many types of support of apple trees such as single support, fence-type, matrix-type have been used; however, there is no standard type designed or specified by a code or manual. Most of the support is set up by farmers based on their experience, which results in frequent damage by typhoon. In this study, a prototype support for apple tree suggested by 'Rural Development Administration' is modelled for structural analysis. The previous test results of other trees for wind tunnel test is used as an input of numerical modeling, and the turnover test result of an apple tree is used to assess the strength of the support system. Numerical analysis is conducted for an assumed wind speed based on the test results to estimate the safety of the support. The appropriate steel-pile sizes of fence-type support are suggested based on the analysis result, which might be used as the standard type of support. Analysis results are also used for new design of the support with respect to a different wind speed by using the analysis model.

Effects of Water and Thermal Contact Resistance on the Temperature Field of Concrete Filled Steel Tubular Columns

2012 ◽  
Vol 166-169 ◽  
pp. 2543-2547
Author(s):  
Jin Sheng Han ◽  
Xiao Ting Wang ◽  
Qi Wo Sun
Keyword(s):  
Temperature Field ◽  
Numerical Analysis ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Good Accuracy ◽  
Thermal Contact ◽  
Steel Tube ◽  
Test Results ◽  
Tubular Columns ◽  
Numerical Program

The water separated from concrete and the thermal contact resistance between steel tube and concrete have important effects on the temperature field of concrete filled steel tubular columns subjected to fire. Therefore, it is necessary to consider these effects in many cases to obtain accurate results of temperature field. The actual influences of water and thermal contact resistance on the temperature field of concrete filled steel tubular columns are analyzed in this paper, and the corresponding simplified methods are presented to take into account these effects in numerical analysis. A numerical program using these simplified methods is developed to calculate the temperature field of concrete filled steel tubular columns under fire. It can be shown by the comparison with the test results that the methods adopted in this paper have good accuracy and feasibility, and can obviously improve the calculation precision of temperature field.

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