The Design of Ultra-Large Hydraulic-Balance Oil Tank With Double-Shell

2011 ◽  
Author(s):  
Guowei Cao ◽  
Zhiping Chen ◽  
Wenjing Guo
Keyword(s):  
Large Scale ◽  
Element Model ◽  
Working Principle ◽  
Oil Tank ◽  
The Difference ◽  
Rational Construction ◽  
Oil Tanks ◽  
The Cost ◽  
The Finite Element Model ◽  
Hydraulic Balance

Large-scale oil tanks are being studied all along because they have a series of advantages. For example, they can reduce the cost of manufacturing and management of the facilities, and save land. So the volume of oil tanks becomes larger and larger during their development. However, without on-site heat treatment, the thickness of the shell of traditional oil tanks is restricted to 200,000 m3. In this paper, a new structure named Ultra-large Hydraulic-Balance oil tank with double-shell was put forward. With the method of hydraulic-balance, oil tanks of this structure could be larger than 200,000 m3. Besides expounding the working principle in detail, a 200,000 m3 oil tank with double-shell was also designed in the paper according to API 650, and the finite element model was used to analyze the stress including intensity and distribution of both shells in order to test and verify its security. Furthermore, its economy was analyzed by comparing with traditional oil tanks. Finally, the problem caused by the difference of liquid lever as well as was discussed. Results show that Ultra-large Hydraulic-Balance oil tank with double-shell owned advantages including rational construction, economy and easy manufacturing.

Study on the Buckling Analysis of Stiffened Spherical Shallow Shell for Gasholder Roof

2013 ◽  
Vol 709 ◽  
pp. 320-324
Author(s):  
Dong Yun Jia ◽  
Jun Yang ◽  
De Jin Jiang
Keyword(s):  
Shallow Shell ◽  
Large Scale ◽  
Element Model ◽  
External Pressure ◽  
Buckling Analysis ◽  
Analysis Method ◽  
Plate Method ◽  
Rigidity Analysis ◽  
Shell Design ◽  
The Finite Element Model

Subjected to external pressure, buckling analysis is key problem in the roof shell design of large scale cylinder gasholder. Two simplified buckling analysis methods, the continuous orthotropic plate method and the split-rigidity method, are introduced to check the general instability of stiffened spherical shallow shell. Considering the plate and the stiffeners in two directions with the same contribution to the bending stiffness, the equivalent bending thickness formula is put forward. The finite element model for a 100,000 m³cylinder gasholder roof is setup. The buckling critical loads obtained prove that the split-rigidity analysis method and formulae are applicable. The results can be referred in design of stiffened spherical shallow shell.

A Flexure-Based Displacement Reducer Capable of Achieving Very Large Reduction Ratio

2021 ◽  
Author(s):  
Houqi Wu ◽  
Guimin Chen
Keyword(s):  
Element Model ◽  
Reduction Ratio ◽  
Large Reduction ◽  
Magnetostrictive Actuators ◽  
Limited Output ◽  
Bridge Type ◽  
The Difference ◽  
Kinetostatic Model ◽  
The Finite Element Model ◽  
Very High

Abstract Piezo actuators and giant magnetostrictive actuators are widely used in micropositioning and micromanipulating devices. Due to their limited output stroke, flexure-based displacement amplifiers are usually employed to meet the large-stroke requirements. Although amplifiers increase the stroke of the actuators, they lower the resolution of the motion, making it difficult to obtain positioning of nanometer or even sub-nanometer resolution. To achive very high resolution from these actuators, a compact flexure-based displacement reducer, which shows the capability of obtaining very large reduction ratio, is proposed in this work. The reducer contains two bridge-type flexure mechanisms connected in a way that the output of the reducer equals the difference of the outputs of the two mechanisms (thus is called the bridge-type differential displacement reducer). If the two bridge-type flexure mechanisms are identical, no matter how large the input is, the output will always be 0, indicating an infinite reduction ratio theoretically. Therefore, introducing a slight difference between the two mechanisms can yield a very large reduction ratio. A kinetostatic model for the reducer is developed, base on which a reducer exhibiting a reduction ratio of 100 is designed and prototyped. The results of the kinetostatic model, the finite element model and the experiment agree well with each other, validating the effectiveness of the proposed reducer and the correctness of kinetostatic model.

A Method for Determining the Springing Displacements of Arch Bridges without Technical Data

2011 ◽  
Vol 94-96 ◽  
pp. 375-380
Author(s):  
Xiao Dong Zhang ◽  
Yong Qiang Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Optimization Problem ◽  
Element Model ◽  
Technical Data ◽  
Numerical Examples ◽  
The Difference ◽  
Arch Bridges ◽  
The One ◽  
The Finite Element Model

A method for determining the springing displacements and arch axis of old arch bridges without technical data is presented. By minimizing the difference between the arch axis predicted by the finite element model and the one obtained by assumed arch equation, the optimization problem is formulated and solved. Two numerical examples are given and the results are discussed.

Finite Element Analysis on Large-Scale Electrical Dust Precipitator Steel Structures

2013 ◽  
Vol 753-755 ◽  
pp. 1196-1200
Author(s):  
Lu Yu Huang ◽  
Yang Gao ◽  
Xia Cao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Optimization Design ◽  
Large Scale ◽  
Steel Structures ◽  
Element Model ◽  
Element Analysis ◽  
Dust Precipitator ◽  
The Finite Element Model

Based on the construction features of the steel structures of a type of electrical dust precipitator, a finite element model is established with large-scale finite element analysis software ANSYS, and the structure stress and displacement of the model under all sorts of loads are analyzed with the frontal solution method. The results indicate that analysis is relatively accurate, the finite element model and the analysis method is appropriate. The result can be further used for optimization design of the electrical precipitator steel structures.

Modal Analysis of Helical Milling Unit

2012 ◽  
Vol 482-484 ◽  
pp. 2454-2459 ◽  
Author(s):  
Xu Da Qin ◽  
Cui Lu ◽  
Qi Wang ◽  
Hao Li ◽  
Lin Jing Gui
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Properties ◽  
Three Dimensional ◽  
Element Model ◽  
Helical Milling ◽  
Mode Shapes ◽  
Three Dimensional Model ◽  
Working Principle ◽  
The Finite Element Model

Based on the analysis of the working principle and structure characteristics of helical milling unit, the prototype’s three-dimensional model was built, the prototype’s finite element modal analysis was conducted, and the first 6 natural frequencies and their mode shapes were obtained. The finite element model is experimentally validated by comparing finite element and experimental modal’s parameters. This paper investigates the dynamic properties of prototype, and provides theoretical references for the subsequent dynamic analysis and structural optimization.

scholarly journals DETECTION OF GEOMETRIC KEYPOINTS AND ITS APPLICATION TO POINT CLOUD COARSE REGISTRATION

2016 ◽  
Vol XLI-B3 ◽  
pp. 187-194 ◽  
Author(s):  
M. Bueno ◽  
J. Martínez-Sánchez ◽  
H. González-Jorge ◽  
H. Lorenzo
Keyword(s):  
Point Cloud ◽  
Large Scale ◽  
Mean Squared Error ◽  
Original Data ◽  
Common Reference ◽  
Difference Of Gaussians ◽  
3D Data ◽  
Coarse Registration ◽  
The Difference ◽  
The Cost

Acquisition of large scale scenes, frequently, involves the storage of large amount of data, and also, the placement of several scan positions to obtain a complete object. This leads to a situation with a different coordinate system in each scan position. Thus, a preprocessing of it to obtain a common reference frame is usually needed before analysing it. Automatic point cloud registration without locating artificial markers is a challenging field of study. The registration of millions or billions of points is a demanding task. Subsampling the original data usually solves the situation, at the cost of reducing the precision of the final registration. In this work, a study of the subsampling via the detection of keypoints and its capability to apply in coarse alignment is performed. The keypoints obtained are based on geometric features of each individual point, and are extracted using the Difference of Gaussians approach over 3D data. The descriptors include features as eigenentropy, change of curvature and planarity. Experiments demonstrate that the coarse alignment, obtained through these keypoints outperforms the coarse registration root mean squared error of an operator by 3 - 5 cm. The applicability of these keypoints is tested and verified in five different case studies.

Mechanics analysis of long span railroad cable-stayed bridge under effect of vertical loads

2021 ◽  
Author(s):  
Jun-Qing Lei ◽  
Xian-Qing Zhang ◽  
Shu-Lun Guo ◽  
Zu-Wei Huang ◽  
Wu-Qin Wang
Keyword(s):  
Large Scale ◽  
Engineering Application ◽  
Element Model ◽  
Design Parameters ◽  
Live Load ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Large Scale Analysis ◽  
Calculation Results ◽  
The Finite Element Model

<p>This paper aims to explore the challenge of the design of over one-kilometer-long span road-rail cable-stayed bridge. Because of the large live load and the weight of the structure itself, it has important theoretical significance and engineering application value to study the design parameters of the long Road-Rail cable-stayed bridge with a main span of over 1000 m. The main content of this paper is to study the Steel Road-Rail Cable-stayed Bridge with a main span of 1200 m. The finite element model is established by large-scale analysis software to calculate the response of the structure under load. Based on the calculation results, the rationality of long-span cable-stayed bridge are preliminarily researched. Wind and seismic loads are not considered.</p>

An Advanced Numerical Model for Assessing 3-D Wind Fields

2007 ◽  
Author(s):  
Darrell W. Pepper ◽  
Xiuling Wang
Keyword(s):  
High Resolution ◽  
Large Scale ◽  
Element Model ◽  
Integral Function ◽  
Wind Fields ◽  
Local Flow ◽  
Irregular Terrain ◽  
Topographic Features ◽  
Element Size ◽  
The Difference

An h-adaptive mass consistent finite element model (FEM) is developed for constructing 3-D wind fields over irregular terrain. The h-adaptive FEM allows the element size to be changed dynamically according to local flow and topographic features. The mesh is refined and unrefined to satisfy preset error criteria. Localized high resolution wind fields can be constructed. The FEM model uses a variational method in an integral function that minimizes the variance of the difference between the observed and analyzed variable. Simulation results are presented for constructing 3-D wind fields for two regions in Nevada. The method appears promising for accurately depicting large scale wind fields, especially where high resolution is needed to capture rapidly changing flows associated with local topographic features.

Deformation Characteristic Evaluation of Large Oil Storage Tanks under the Planar Inclined Foundation

2013 ◽  
Vol 351-352 ◽  
pp. 786-789
Author(s):  
Da Wei Ji ◽  
Li Xin Wei ◽  
Xiao Yan Li
Keyword(s):  
Stress Distribution ◽  
Storage Tank ◽  
Large Scale ◽  
Deformation Characteristic ◽  
Oil Industry ◽  
Element Model ◽  
Storage Tanks ◽  
Oil Storage ◽  
Oil Storage Tank ◽  
The Finite Element Model

Oil storage tank plays an important role in modern oil industry. The development of large-scale oil storage tanks has resulted in the complexity of stress distribution and deformation situation of tank wall and tank bottom. Especially in soft foundations, the tank structure is susceptible to various types of settlement deflections. The most common type is planar inclined foundation. In this paper, the finite element model of large-scale oil storage tank was built according to the pattern of design and the deformation characteristic and stress distribution of large storage tank under the planar inclined foundation was obtained. Considering the floating roof, the ultimate value of large storage tank under the planar inclined foundation is determined.

Increase of Fatigue on Piston and Connecting Rod in Using Supercharger

2012 ◽  
Vol 622-623 ◽  
pp. 1243-1247
Author(s):  
Shahed Torkamandi ◽  
Farhad Asadi ◽  
Gholamhasan Payganeh
Keyword(s):  
Maximum Stress ◽  
Material Model ◽  
Element Model ◽  
Connecting Rod ◽  
Piston Engine ◽  
Analysis Techniques ◽  
Linear Material ◽  
The Cost ◽  
Strength And Durability ◽  
The Finite Element Model

This research deals with analysis the fatique and the failure of piston engine using FEA.The objective of this research is to develop the geometry of piston engine using solidwork software and to investigate the maximum stress using stress analysis techniques to predict the failure of piston and connecting rod and identify the critical locations of the components of EF7 engine with supercharger and without supercharger. The finite element model of the components was analyzed the static stress with linear material model . first we discuss the amount of increased pressure in cylinder by supercharger and turbocharger then the influence of the inlet air pressure on the naturall aspirated engine which the main parts of its engine are not reinforced is taken account,then the result is showed the stress is increased by quantity of 273 MPA on piston and connecting rod which make the increase of fatigue on pistons and connecting rod and decrease in its period of working.The results can also significantly reduce the cost to produce the piston,and improve product reliability and improve the fatique strength and durability.

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