Numerical Simulation of a Self-Decoupling Magneto-Rheological Damper on Electromagnetic-Thermal Coupling

2010 ◽  
Vol 139-141 ◽  
pp. 2386-2390 ◽  
Author(s):  
Guo Jun Yu ◽  
Cheng Bin Du ◽  
Fa Xue Wan
Keyword(s):  
Large Scale ◽  
Magnetic Flux Density ◽  
Fe Model ◽  
Thermal Coupling ◽  
Analysis Model ◽  
Damping Force ◽  
Element Analysis ◽  
Temperature Changes ◽  
Sequential Coupling ◽  
Magneto Rheological

Based on electromagnetic-thermal coupling field mechanism, a large-scale finite element analysis model for electromagnetic-thermal coupling global damper is established by ANSYS software. Electromagnetic field and temperature field sequential coupling analysis method is used in this study. Relative permeability and resistivity of magnetic material with temperature is also considered in the FE model. The simulation results show that the temperature of self- decoupling magnetic damper rises rapidly under external excitation, the temperature changes the magnetic fluid yoke and the materials’ core parameters, magnetic flux density in damper channel gradually decreases with the time, and the damping force decreases, finally the high temperature decline phenomenon is revealed.

Numerical Simulation Analysis in Cooling Temperature Field and Bending Deformation after Rolling of 100-Meter Rail

2011 ◽  
Vol 121-126 ◽  
pp. 4523-4527
Author(s):  
Yu Yan Liu ◽  
Yan Wang ◽  
Lin Chen ◽  
Ge Li ◽  
Jian Guo Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Large Scale ◽  
Simulation Analysis ◽  
Analysis Model ◽  
Cooling Process ◽  
Element Analysis ◽  
Stress Variation ◽  
Finite Element Analysis Model ◽  
Bending Deformation

The paper established U75V 100-meter rail 3-D transient non-liner finite element analysis model about U75V 100-meter rail by using the large-scale non-liner finite element analysis software ABAQUS. By analyzing the different positions in the section of the temperature variation, the changes of bending degree and the residual stress variation after the bending deformation have changed. Based on the 100-meter straight rail in natural cooling under the cooling process, simulation results showed that in the cooling process, deflection change with time mainly divided into four stages; In consideration of the friction effect, the flat rail cold curve for its deformation among roughly flat, the curve about either ends, the scope for bending is 18 meters, the maximal displacement is 1.88 meters while the flat rail occured end colding.

Buffer-Induced Design and Dynamic Response of Wheel Loader ROPS

2011 ◽  
Vol 314-316 ◽  
pp. 1591-1596
Author(s):  
Xiang Jun Yu ◽  
Ming Yao Yao
Keyword(s):  
Dynamic Response ◽  
Optimization Design ◽  
Large Scale ◽  
Method Comparison ◽  
Analysis Model ◽  
Element Analysis ◽  
Wheel Loader ◽  
Dynamic Finite Element Analysis ◽  
Entire Vehicle ◽  
Induced Structure

A new Rollover Protective Structure (ROPS) of the large-scale wheel loader was designed based on a buffer-induced structure. Dynamic Finite Element analysis model of the entire vehicle was created and boundary conditions of typical rollover cases were given. Optimization design of this new ROPS was obtained through a comprehensive analysis of 16 dynamic simulation samples, which were designed by Orthogonal Experimental Method. Comparison analysis of dynamic response results between original ROPS and optimal new ROPS indicates that this new ROPS effectively prolonged the duration time of the first collision and reduced the acting time of peak force. Deformation extent of main structure of this new ROPS is significantly smaller than that of the original ROPS. Buffer-induced structures can increase the kinetic energy absorption capability of ROPS. Therefore, it can reduce the possibility of brittle fracture of ROPS and improve the probability of operator survival.

Analytical Methodology for Evaluating Stress and Strain of Pipeline Exposed in Flood

2010 ◽  
Author(s):  
Xiaolin Wang ◽  
Jian Shuai ◽  
Xiaomin Guo
Keyword(s):  
Large Scale ◽  
Pipeline Steel ◽  
Limit State ◽  
Assessment Method ◽  
State Theory ◽  
Nonlinear Material ◽  
Stress And Strain ◽  
Analysis Model ◽  
Element Analysis ◽  
Analytical Methodology

River-crossing pipeline is threatened by flood which could induce pipeline being eroded and exposed, moreover, floating in a large scale. Under the combined effects of dynamic wave, buoyancy, gravity and resistance of bank soil, pipeline presents spatial deformation. A mechanical analysis model is built according to loadings on pipeline and deformation of pipeline. Taking into account nonlinear soil-pipe interaction, axial force, nonlinear material property of pipeline steel and spacial deformation of pipeline, an analytical methodology for evaluating pipeline deformation and stress distribution is developed. Compatibility equation of pipeline physical elongation and geometrical elongation is derived, by which pipeline stress and strain are calculated with iterative method. Based on proposed methodology, a computer program is developed and a series of cases of pipeline in flood are analyzed with it. Compared with finite element analysis, results of proposed methodology are well accepted. Finally, safety assessment method for pipeline in flood is proposed based on limit state theory and the safety of pipeline exposed in mountain torrent are evaluated.

FE Simulation of Torque and Drag inside Borehole of Oil and Gas Wells (Part II)

2015 ◽  
Vol 723 ◽  
pp. 240-245
Author(s):  
Yousif E.A. Bagadi ◽  
De Li Gao ◽  
Abdelwahab M. Fadol
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth.The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. A FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results.The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

Development of High Damping Magneto-Rheological Mount for Ship Engines

2013 ◽  
Vol 336-338 ◽  
pp. 953-959 ◽  
Author(s):  
Quoc Hung Nguyen ◽  
Do Xuan Phu ◽  
Joon Hee Park ◽  
Seung Bok Choi ◽  
Ok Hyun Kang
Keyword(s):  
Magnetorheological Fluid ◽  
Governing Equations ◽  
Damping Force ◽  
Element Analysis ◽  
Bingham Plastic ◽  
Force Ratio ◽  
Valve Structure ◽  
Engine Mount ◽  
Magneto Rheological ◽  
State Force

In this paper, novel configurations of a compact and high damping force engine mount featuring magnetorheological fluid (MRF) is proposed and analyzed. In the mount, a MR valve structure with both annular and radial flows is employed to generate a high damping force. Firstly, several configurations of the MR mount are proposed. The MRF flows in the mount are then analyzed and the governing equations of the MR mount are then derived based on Bingham plastic behaviour of the MRF. Optimal design of the proposed MR mount is then considered. In the optimization, the objective is to find out the optimal structure of the MR mount that can generate a maximum damping force while the off-state force of the mount is constrained in such a manner that the force ratio of the mount is greater than a required value. Performance of the optimized MR mount is then evaluated based on finite element analysis and validated by experimental results.

Structural Analysis and Improvement of Large-Scale Forklift's Wheel Rim

2013 ◽  
Vol 712-715 ◽  
pp. 1080-1083
Author(s):  
Hu Qi Wang ◽  
Hai Zhao He ◽  
Hai Yan Lu ◽  
Rong Xing Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Large Scale ◽  
Element Model ◽  
Analysis Model ◽  
Element Analysis ◽  
Wheel Rim ◽  
Weak Part ◽  
The Finite Element Analysis

A large-scale forklift's wheel rim appeared cracking phenomenon in the course of use. This article summarized and analyzed force of the forklift's wheel rim according to the typical working conditions of forklift, and calculated the load of various working conditions. It provided the correct boundary conditions for the finite element analysis of the wheel rim [. After the analysis of wheel rim's three typical conditions, found the weak parts of the structure of the rim, and this part was consistent with the feedback part, so it proved correct of the finite element analysis model. Clever was used ribbed-plate and punching groove to strengthen the weak part of wheel rim and the finite element model was used to calculate and check the improved wheel rim again. The results showed that the improved wheel rim stress decreased quite, so the measure was correct.

The Effects of Substrate Temperature on the Residual Stress for EBPVD TBCs

2008 ◽  
Vol 575-578 ◽  
pp. 1276-1280
Author(s):  
Ye Sheng Zhong ◽  
Li Ping Shi ◽  
Jia Yu ◽  
Xiao Dong He
Keyword(s):  
Residual Stress ◽  
Thermal Barrier Coating ◽  
Physical Vapor Deposition ◽  
Large Scale ◽  
Raw Material ◽  
Thermal Barrier ◽  
Fe Model ◽  
Laminar Shear Stress ◽  
Element Analysis ◽  
Barrier Coating

The preparation technologies of thermal barrier coating by the Electron Beam Physical Vapor Deposition (EBPVD) technique were briefly introduced in this paper. And design principal of thermal barrier coating is discussed, at the same time the selection of raw material was also taken into account. On the basis of several assumed perfect conditions, a reasonable Finite Element Analysis (FEA) physical model was built up in order to exactly describe the whole deposition process. Taking the advantage of the large-scale commercial software of FEA, the distribution of residual stress and the possible displacement tendency were obtained. The analysis results show that: with the increasing substrate preheating temperature, the inter-laminar shear stress increases but the axial residual stress decreases. And the probability of cracking after de-bonding tends to enhance as the thickness of deposition coating is increased. Also it is verified that the FE model has produced little numerical error.

FE Simulating of Torque and Drag inside Borehole of Oil and Gas Wells

2014 ◽  
Vol 1030-1032 ◽  
pp. 781-785
Author(s):  
Yousif E.A. Bagadi ◽  
Abdelwahab M. Fadol ◽  
De Li Gao
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth. The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. a FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results. The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

Development of Large Capacity Semi-Active Seismic Damper Using Magneto-Rheological Fluid

2004 ◽  
Vol 126 (1) ◽  
pp. 105-109 ◽  
Author(s):  
Hiroshi Sodeyama ◽  
Kohei Suzuki ◽  
Katsuaki Sunakoda
Keyword(s):  
Magnetic Fields ◽  
Large Scale ◽  
Hysteresis Loops ◽  
Mr Damper ◽  
Damping Force ◽  
Engineering Structures ◽  
Mr Fluid ◽  
Large Capacity ◽  
Mr Fluids ◽  
Magneto Rheological

In recent years, there has been increasing research in several industrial fields for development of semi-active vibration control devices. In particular, devices using magneto-rheological (MR) fluid have been attracting great research interest because they can realize high performance as capacity-variable dampers. MR fluids are controllable fluids that respond to applied magnetic fields. Applied magnetic fields drastically change the viscosity of MR fluids from an oily state to a semi-solid state. This paper describes a study on a large capacity device using an MR fluid, i.e., an MR damper. This developed MR damper provides a maximum damping force of 300 kN. Various tests were carried out and the dynamic characteristics, force-displacement hysteresis loops and controllable forces were investigated. These tests verified that the MR damper provides a technology that enables effective semi-active control of large-scale structure systems, i.e., real buildings and civil engineering structures.

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