Influence of the electrical circuit configurations of a DVR coupling transformer with a magnetic bypass

2017 ◽  
Vol 36 (3) ◽  
pp. 804-810 ◽  
Author(s):  
Virginie Majchrzak ◽  
Guillaume Parent ◽  
Jean-François Brudny ◽  
Valentin Costan ◽  
Philippe Guuinic
Keyword(s):  
Finite Element ◽  
Magnetic Core ◽  
Electrical Circuit ◽  
Finite Element Analyses ◽  
Dynamic Voltage Restorer ◽  
Content Type ◽  
Electrical Grid ◽  
Element Simulation ◽  
Dynamic Voltage ◽  
Gap Principle

Purpose For the proposed coupling transformer, a magnetic bypass based on the virtual air gap principle is realized by inserting auxiliary windings in a return leg added to a standard transformer. With such a setup, it is able to act as a voltage regulator as well as protect the power electronics of the dynamic voltage restorer from electrical grid fault currents. This paper focuses on the electrical design part of the coupling transformer. It aims to explain how the behavior of the auxiliary windings electrical circuit of the magnetic bypass impacts the performances of the device. Design/methodology/approach The influence of the electrical auxiliary windings circuit configurations on the operation of the coupling transformer is studied by finite element analyses with nonlinear and isotropic magnetic materials. Findings A configuration for the realization of the electrical circuit of the auxiliary windings is determined according to the finite element simulation results to achieve the design of the coupling transformer whose magnetic core was previously designed. Originality/value By studying the operation of a special coupling transformer with nonlinear saturation phenomenon by finite element analyses, a to-do list of the electrical circuit parameters is described to design this device well.

Investigation on endurance evaluation of a portal crane: experimental, theoretical and finite element analysis

2020 ◽  
Vol 62 (4) ◽  
pp. 357-364
Author(s):  
Yusuf Aytaç Onur ◽  
Hakan Gelen
Keyword(s):  
Finite Element ◽  
Critical Points ◽  
Maximum Stress ◽  
Strain Gages ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Element Simulation ◽  
Main Girder ◽  
Stressed Component ◽  
Portal Crane

Abstract In this study, the stress on portal crane components at various payloads has been investigated theoretically, numerically and experimentally. The portal crane was computer-aided modeled and finite element analyses were performed so that the most stressed points at the each trolley position investigated on the main girder could be determined. In addition, the critical points were marked on the portal crane, and strain gages were attached to the those critical points so that stress values could be experimentally determined. The safety factor values at different payloads were determined by using finite element simulation. Results indicate that the most stressed component in the examined portal crane is the main girder. Experimental results indicate that the maximum stress value on the main girder is 3.05 times greater than the support legs and 8.99 times larger than the rail.

Accurate composition dependent thermo mechanical lifetime estimation of hour glass type solder joint in electronic assemblies

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Leonid Anatolevich Olenev ◽  
Rafina Rafkatovna Zakieva ◽  
Nina Nikolaevna Smirnova ◽  
Rustem Adamovich Shichiyakh ◽  
Kirill Aleksandrovich Ershov ◽  
...  
Keyword(s):  
Finite Element ◽  
Chemical Composition ◽  
Solder Joint ◽  
Design Methodology ◽  
Lifetime Estimation ◽  
Creep Tests ◽  
Content Type ◽  
Element Simulation ◽  
Glass Type ◽  
Electronic Assemblies

Purpose This study aims to present a more accurate lifetime prediction model considering solder chemical composition. Design/methodology/approach Thermal cycling and standard creep tests as well as finite element simulation were used. Findings The study found lower error in the solder joint lifetime evaluation. The higher the Ag content is, the higher the lifetime is achieved. Originality/value It is confirmed.

Design of an electromagnetic actuator for parametric stiffness excitation

2007 ◽  
Vol 26 (3) ◽  
pp. 800-813 ◽  
Author(s):  
Erich Schmidt ◽  
Wolfgang Paradeiser ◽  
Fadi Dohnal ◽  
Horst Ecker
Keyword(s):  
Finite Element ◽  
Permanent Magnets ◽  
Electromagnetic Actuator ◽  
Finite Element Analyses ◽  
Coil Current ◽  
Content Type ◽  
Electromechanical Device ◽  
Stiffness Variation ◽  
Actuator Design ◽  
First Time

PurposeAn overview is given on design features, numerical modelling and testing of a novel electromagnetic actuator to achieve a controllable stiffness to be used as a device for parametric stiffness excitation.Design/methodology/approachIn principle, the actuator consists of a current driven coil placed between two permanent magnets. Repellent forces are generated between the coil and the magnets, centering the coil between the two magnets. The 2D finite element analyses are carried out to predict the forces generated by this arrangement depending on coil current and coil position. Force measurements are also made using the actual device.FindingsActuator forces as predicted by the finite element analyses are in excellent agreement with the measured data, confirming the validity of the numerical model. Stiffness of the actuator is defined as the increase of force per unit of coil displacement. Actuator stiffness depends linearly on the coil current but in a nonlinear manner on the coil displacement. The performance of the actuator is sufficient to demonstrate the effect of a so‐called parametric anti‐resonance on a test stand.Research limitations/implicationsAlthough the performance of the actuator is satisfactory, there is potential for further improvement of the actuator design.Originality/valueThis paper reports for the first time on an electromechanical device to create a time‐periodic stiffness variation to be used for research in the field of parametrically excited mechanical systems. The device is used to prove experimentally an effect to suppress mechanical vibrations which has been studied so far only in theoretical studies.

Damage estimator, a possible way to predict the failure of hip and knee endoprosthesis

2017 ◽  
Vol 69 (1) ◽  
pp. 71-80 ◽  
Author(s):  
Lucian Capitanu ◽  
Virgil Florescu ◽  
Liliana-Laura Badita
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Damage Function ◽  
Acetabular Cup ◽  
Fatigue Wear ◽  
Content Type ◽  
Damage Score ◽  
Element Simulation ◽  
Linear Behaviour ◽  
Contact Mechanism

Purpose The purpose of this study was to realize finite element simulation in order to dynamically determine the area of the contact, the contact pressure and the strain energy density (identified as a damage function) for three different activities – normal walking, ascending stairs and descending stairs – that could be considered to define the level of the activity of the patient. Design/methodology/approach The finite element model uses a modern contact mechanism that includes friction between the metallic femoral condyles or femoral head (considered rigid) and the tibial polyethylene insert or acetabular cup (considering a non-linear behaviour). Findings For all three activities, the finite element analyses were performed, and a damage score was computed. Finally, a cumulative damage score (that accounts for all three activities) was determined, and the areas where the fatigue wear is likely to occur were identified. Originality/value A closer look at the distribution of the damage score reveals that the maximum damage is likely to occur not at the contact surface, but in the subsurface.

scholarly journals Finite element modeling of nanoindentation on an elastic-plastic microsphere

2020 ◽  
Author(s):  
Jialian Chen ◽  
Hongzhou Li
Keyword(s):  
Finite Element ◽  
Mechanical Behavior ◽  
Computational Study ◽  
Theoretical Method ◽  
Finite Element Analyses ◽  
Structured Materials ◽  
Elastic Plastic ◽  
Element Simulation ◽  
Insight Into

Abstract The understanding of the mechanical indentation on a curved specimen (e.g., microspheres and microfibers) is of paramount importance in the characterization of curved micro-structured materials, but there has been no reliable theoretical method to evaluate the mechanical behavior of nanoindentation on a microsphere. This article reports a computational study on the instrumented nanoindentation of elastic-plastic microsphere materials via finite element simulation. The finite element analyses indicate that all loading curves are parabolic curves and the loading curve for different materials can be calculated from one single indentation. The results demonstrate that the Oliver-Pharr formula is unsuitable for calculating the elastic modulus of nanoindentation involving cured surfaces. The surface of the test specimen of a microsphere requires prepolishing to achieve accurate results of indentation on a micro-spherical material. This study provides new insight into the establishment of nanoindentation models that can effectively be used to simulate the mechanical behavior of a microsphere.

Cu/SnAgCu/Cu TLP with different thicknesses for 3D IC

2017 ◽  
Vol 29 (3) ◽  
pp. 151-155 ◽  
Author(s):  
Liang Zhang ◽  
Zhi-quan Liu ◽  
Fan Yang ◽  
Su-juan Zhong
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Integrated Circuit ◽  
Three Dimensional ◽  
Transient Liquid Phase ◽  
Compound Layer ◽  
Intermetallic Compound Layer ◽  
3D Ic ◽  
Content Type ◽  
Element Simulation

Purpose This paper aims to investigate Cu/SnAgCu/Cu transient liquid phase (TLP) bonding with different thicknesses for three-dimensional (3D) integrated circuit (IC). Design/methodology/approach This paper includes experiments and finite element simulation. Findings The growth rate of the intermetallic compound layer during TLP soldering was calculated to be 0.6 μm/s, and the small scallop-type morphology Cu6Sn5 grains can be observed. With the decrease in thickness in solder joint, the thickness of intermetallic compounds represents the same size and morphology, but the size of eutectic particles (Ag3Sn, Cu6Sn5) in the matrix microstructure decrease obviously. It is found that with the increase in thickness, the tensile strength drops obviously. Based on finite element simulation, the smaller value of von Mises demonstrated that the more reliability of lead-free solder joints in 3D IC. Originality/value The Cu/SnAgCu/CuTLPbondingwithdifferentthicknessesfor3D IC was investigated.

scholarly journals Thermal-Mechanical Coupled Manufacturing Simulation in Heterogeneous Materials

2016 ◽  
Vol 2 (11) ◽  
pp. 600-606 ◽  
Author(s):  
Abdelouahid El Amri ◽  
M. El Yakhloufi Haddou ◽  
A. Khamlichi
Keyword(s):  
Finite Element ◽  
Mechanical Damage ◽  
Numerical Procedure ◽  
Calibration Procedure ◽  
Finite Element Analyses ◽  
Element Simulation ◽  
Proposed Model ◽  
Main Target ◽  
6061 Aluminium Alloy ◽  
Strength And Ductility

This work is aimed to investigate on thermal and thermo-mechanical behaviour of 6061 Aluminium alloy. The main target of the present investigation is to apply a numerical procedure to assess the thermo-mechanical damage. Finite element analyses of the notched tensile specimens at high temperature have been carried out using ABAQUS Software. The objective was to study the combined effects of thermal and mechanical loads on the strength and ductility of the material. The performance of the proposed model is in general good and it is believed that the presented results and experimental–numerical calibration procedure can be used in practical finite-element simulation.

Reliability assessment of ball grid array joints under combined application of thermal and power cycling: solder geometry effect

2020 ◽  
Vol 33 (1) ◽  
pp. 27-33
Author(s):  
Sathish Kumar ◽  
Oleg R. Kuzichkin ◽  
Ahmed Faisal Siddiqi ◽  
Inna Pustokhina ◽  
Aleksandr Yu Krasnopevtsev
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Thermal Loading ◽  
Thermal Power ◽  
Electronic System ◽  
Operating Conditions ◽  
Simultaneous Application ◽  
Content Type ◽  
Power Cycling ◽  
Element Simulation

Purpose This study aims to investigate simultaneous power and thermal loading. Design/methodology/approach Finite element method simulations coupled with experiments. Findings The effects of power cycling have been determined. Originality/value This paper aims to testify the combined effects of thermal and power cycling loads on the reliability of solder ball joints with barrel- and hourglass-type geometries in an electronic system. The finite element simulation outcomes showed that the maximum strain energy was accumulated at the edges of barrel-type solder, whereas the hourglass-type was vulnerable at the necking side. It was also found that the hourglass-type solder showed a reliable behavior when the sole thermal cycling was exerted to the electronic system, whereas the barrel-type solder was a better choice under simultaneous application of thermal and power loadings. The experimental results also confirmed the finite element simulation and indicated that the solder joint reliability strongly depends on the geometry of interconnection in different operating conditions. An extensive discussion was presented to shed light on the paramount importance of combined thermal/power cycling on the reliability of solder joints.

Influence of feed per tooth on tool wear based on 3D finite element simulation in micro-milling of Inconel 718

2017 ◽  
Vol 69 (4) ◽  
pp. 585-590 ◽  
Author(s):  
Xiaohong Lu ◽  
FuRui Wang ◽  
Zhenyuan Jia ◽  
Likun Si ◽  
Yongqiang Weng
Keyword(s):  
Finite Element ◽  
Tool Wear ◽  
Finite Element Simulation ◽  
Inconel 718 ◽  
Chip Thickness ◽  
Micro Milling ◽  
Wear Depth ◽  
Content Type ◽  
Element Simulation ◽  
The Relationship

Purpose This paper aims to predict tool wear and reveal the relationship between feed per tooth and tool wear in micro-milling Inconel 718 process. Design/methodology/approach To study and solve the tool wear problem in micro-milling of Inconel 718 micro components, in this paper, the investigation of micro-milling Inconel 718 process was implemented based on DEFORM finite element simulation, and tool wear depth of micro-milling cutter acted as output. Findings Different from the traditional macro milling process, diameter reduction percentage and average flank wear length decreased with the increase of feed per tooth; tool wear depth decreased when the feed per tooth was less than the minimum chip thickness. Originality/value At present, research on the prediction of tool wear in micro-milling of Inconel 718 has never been publicly reported. This study is significant to reveal the relationship between cutting parameters (feed per tooth) and tool wear in micro-milling Inconel 718.

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