Three-dimensional Land FD-CSEM Regularized Inversion Based on Edge Finite-element Method

2018 ◽  
Vol 23 (2) ◽  
pp. 211-222
Author(s):  
Jianxin Liu ◽  
Pengmao Liu ◽  
Xiaozhong Tong
Keyword(s):  
Finite Element ◽  
Electric Fields ◽  
Three Dimensional ◽  
Dipole Source ◽  
Unique Problem ◽  
Three Dimensional Modeling ◽  
Homogeneous Half Space ◽  
Electromagnetic Responses ◽  
Horizontal Electric Dipole ◽  
The Galerkin Method

There is a desire to obtain rapid and stable inversion results and clearly reconstruct subsurface resistivity structure in frequency domain (FD) electromagnetics. Three-dimensional modeling of land FD controlled-source electromagnetic (CSEM) data is vital to improve the understanding of electromagnetic responses collected in increasingly complex geologic settings. Three-dimensional inversion of land FD-CSEM data is a mathematically non-unique problem with instability, due to the noise contained in the data and its inherent incompleteness. The main difference between our method and those from previous work is that the edge finite-element approach is applied to solve the three-dimensional FD-CSEM generated by a horizontal electric dipole source. Firstly, we formulate the edge finite-element equation through the Galerkin method, based on the Helmholtz equation of the electric fields. Secondly, in order to check the validity of the modeling code, we compare the numerical results with the analytical solutions for a homogeneous half-space model. For further tests, we calculate the electromagnetic responses for another two models with more practical structures. Finally, the three-dimensional inversion is carried out based on a regularization method with smoothness-constraints to obtain stable solutions.

Electromagnetic induction by a finite electric dipole source over a 2-D earth

Geophysics ◽  
1993 ◽  
Vol 58 (2) ◽  
pp. 198-214 ◽  
Author(s):  
Martyn J. Unsworth ◽  
Bryan J. Travis ◽  
Alan D. Chave
Keyword(s):  
Finite Element ◽  
Electromagnetic Fields ◽  
Electric Dipole ◽  
Numerical Solutions ◽  
Current Source ◽  
Three Dimensional ◽  
Iterative Solution ◽  
Electromagnetic Response ◽  
Dipole Source ◽  
Horizontal Electric Dipole

A numerical solution for the frequency domain electromagnetic response of a two‐dimensional (2-D) conductivity structure to excitation by a three‐dimensional (3-D) current source has been developed. The fields are Fourier transformed in the invariant conductivity direction and then expressed in a variational form. At each of a set of discrete spatial wavenumbers a finite‐element method is used to obtain a solution for the secondary electromagnetic fields. The finite element uses exponential elements to efficiently model the fields in the far‐field. In combination with an iterative solution for the along‐strike electromagnetic fields, this produces a considerable reduction in computation costs. The numerical solutions for a horizontal electric dipole are computed and shown to agree with closed form expressions and to converge with respect to the parameterization. Finally some simple examples of the electromagnetic fields produced by horizontal electric dipole sources at both the seafloor and air‐earth interface are presented to illustrate the usefulness of the code.

Three-Dimensional Modeling of Geogrid Pullout Test Using Finite-Element Method

2022 ◽  
Vol 22 (3) ◽  
Author(s):  
Iman Amirhosseini ◽  
Vahid Toufigh ◽  
Mohammad Mohsen Toufigh ◽  
Emad Ghazavi-Baghini
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Pullout Test ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Element Method

Motion Simulation and Finite Element Analysis of the Manipulator Based on SolidWorks

2014 ◽  
Vol 596 ◽  
pp. 640-645
Author(s):  
Peng Lu ◽  
Dao Lai Cheng ◽  
Gang Shi ◽  
Zhi Hao Zhou ◽  
Nan Kun Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Motion Simulation ◽  
Welding Robot ◽  
Element Analysis ◽  
Work Space ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Design Structure

It will use SolidWorks to design structure of Manipulator and to establish the Three-dimensional Modeling based on automated welding robot of Shanghai Bamac Electric Technology Co., Ltd.,then by using the plug of simulation and motion of SolidWorks, it will focus on the Motion Simulation and Finite Element Analysis of the Manipulator. Finally the trajectory and the work space of the Manipulate can be received, and provide a basis of manipulator analysis in order to optimize the manipulator for the company.

Based on Bearing Centerless Strengthening and Polishing Processing Multiple Collision Finite Element Simulation Analysis

2011 ◽  
Vol 328-330 ◽  
pp. 624-627
Author(s):  
Ya Fei Ou ◽  
Xiao Chu Liu ◽  
Chuan Jian Liu ◽  
Wen Xiong Li ◽  
Hao Wang
Keyword(s):  
Finite Element ◽  
Compressive Stress ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Multiple Collision ◽  
Surface Residual Stress ◽  
Element Analysis ◽  
Surface Strength ◽  
Three Dimensional Modeling ◽  
Residual Stress State

To further understand the bearing performance’s influence of the plastic deformation after balls and bearing rings surface multiple collision in ball bearing’s strengthening and polishing processing by the strengthening and polishing machine. ABAQUES software is used for finite element analysis in the three-dimensional modeling of multiple collision, and the plastic strengthen the performance of bearings is researched mainly. The results shows that the raceway surface is significant plastic strengthen in multiple collisions, Yield ability is enhanced largely, and surface residual stress state present for the compressive stress. Raceway surface strengthening process requires a particular number of times to ensure the processing, with strengthening processing times increasing, bearing raceway surface strength is saturated, then, the number continued to increase to strengthen, the surface strength is no significant increase. But after the collision of ball, uniform residual compressive stress is forming in the bearing surface, good for improving the fatigue strength and bearing life.

Development of Cylinder with Multiple Diagonal Slits for Ultrasonic Longitudinal - Torsional Vibration Turn-Milling

2010 ◽  
Vol 139-141 ◽  
pp. 2291-2294
Author(s):  
Yun Dian Zhang ◽  
Bing Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Electrical Discharge Machining ◽  
Three Dimensional ◽  
Element Analysis ◽  
Three Dimensional Modeling ◽  
The Finite Element Analysis ◽  
Traditional Processing ◽  
Forming Tools ◽  
Analysis Of Error

Cylinder with multiple diagonal slits is one of the core parts of longitudinal-torsional resonance ultrasonic device. Its structure was more complex, the traditional processing processed it very difficult, and the traditional analytical methods were also difficult to make accurate description to system. The paper researched cylinder with multiple diagonal slits using experimental method, analysis of electrical discharge machining forming tools of the slits and three-dimensional modeling; developed cylinder with multiple diagonal slits, analyzed longitudinal-torsional resonance and mechanical properties of cylinder with multiple diagonal slits using finite element analysis method. Tested resonant frequency of cylinder with multiple diagonal slits with precision impedance analyzer. The finite element analysis results compared with tested results, and analysis of error between them, finite element analysis results slightly lower than the test results but the error was within the allowed range. Comparison of results and analysis of error indicated that developed cylinder with multiple diagonal slits meet requirement.

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