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The operational efficiency of ultra fast actuators used as drives in high voltage direct current breakers are at best 5 %. To boost their efficiency, the design of the energizing circuit is crucial. A multi-physics finite element method (FEM) model coupled with a SPICE circuit model that is able to predict the performance of the actuator with an accuracy of at least 95 % has been developed and verified...
The dual-primal finite element tearing and interconnecting (FETI-DP) method is combined with the Newton-Raphson method to expand the capability and improve the efficiency of three-dimensional finite element analysis (FEA) of nonlinear electromechanical and electric machine problems. Despite its modeling capability and high degree of accuracy, FEA has high computational complexity, especially for nonlinear...
In this paper a miniature circuit breaker (MCB) is analyzed using a finite method analysis (FEA) software. Once the 3D model was implemented, a series of simulations were carried out in order to find out the forces that appear inside the electromechanical trip unit and what influences the plunger to trip faster. Also, the influence of the material nonlinearity is emphasized in order to understand...
In applications of high voltage and low power capacitor charging, conventional magnetic based power converters often suffer from bulky components and poor efficiency. Piezoelectric transformer (PT) based converters however, are compact and efficient, especially at high step-up applications. In this paper an interleaved interdigitated electrode (IDE) multilayer PT utilizing longitude and thickness...
This article analyses and presents an economic evaluation of the impact in load losses of anti-theft metal ducts (throats) in the low-voltage side of pole-mounted single phase distribution transformers. Anti-theft throats are used to cover the low voltage bushings to eliminate the possibility of an unwanted connection to the transformer terminals. The results presented are based on simulations, performed...
Design, analysis and lifetime prediction of a horizontal axis ocean current turbine (OCT) composite blade has been investigated. Loading on a turbine blade under the Gulf Stream in South Florida location (26° 4.3N 79° 55W) at 25 meter depth is calculated and evaluated by using AeroDyn. Static analysis is performed by using NuMAD and ANSYS. Accumulated fatigue damage modeling is employed as a damage...
With the assistances from iteration methodology for heat dissipation property analyses and the effective material properties for the relatively complex PCB structures, this paper extracts the thermal resistance and the transient thermo-mechanical behaviors during reflow for two compactable high power diode packaging through the ANSYS software. After the simulations, further improvements on packaging...
In order to study how the Blank Holder Force (BHF), Die Radius and Drawbead (with or without) affect the stamping performance, this paper takes the automobile oil pan as the example, simulates the drawing procedure on Dynaform. And then analyzes the FLD (Forming Limit Diagram), Thickness or thinning figure and forming results. Finally, we get the optimal BHF and die radius.
As the trend for semiconductor packaging is heading towards BGA and flip chip interconnection methods, the conventional wire bonding process still dominates the industry primarily due the flexibility of wire bonds. The reliability of the bonded wires is assessed through wire bond shear test. In this study, the effects of shear ram speed on the stress response of bonded wires during wire bond shear...
The reliability of wire bond is very significant due to its function of providing interconnection and signal passage to the integrated circuit. Wire bond shear test are utilized to evaluate the reliability and bond strength of bonded wires. In this study, the wire bond shear test is simulated. The effects of shear tool height on the stress response of bonded wires are examined through simulation....
This paper presents a unified modeling and solving approach for multiphysics topology optimization. A multiphysics continuum field is usually controlled by certain partial differential equations (PDE). Based on the general form of the PDE, this paper presents the mathematical model of the multi-objective multiphysics topology optimization, derives the unified solving scheme of the PDE, gets the sensitivities...
Interfacial delamination between molding compound (MC) and die pad interface is the most crucial failure mechanism of exposed pad package under reliability testing due to high interfacial stress and weak adhesion strength. A combined interfacial adhesion characterization, JEDEC Moisture Sensitivity Level 3 and 3X IR reflows qualification and testing, finite element analysis as well as finite element...
Hydrostatic stress of Cu damascene interconnects was calculated by using finite element method in the present work. The analytical work was performed to examine the distribution of hydrostatic stress and the effect of different line width in the Cu interconnects. Then a model of atomic diffusion was presented and used to calculate the size of stress-induced voiding according to result of hydrostatic...
The pedestrian lower leg impactor model was established based on the finite element method and validated against test results. In the worst impact position of the front bumper, the tibia acceleration and bending angle were minimized via optimization design of steel energy absorber and lower bumper system. This paper can offer a direction for the further study and design of the steel energy absorber...
In allusion to the frame of a light truck, by the iSIGHT for optimization platform and ANSYS for strength and stiffness calculation platform, with frame mass minimum for objective function, the parameters of the optimal thickness of the frame parts is sought and the optimal solution is obtained by using the first-order optimal design method with the premise of the frame strength, bending stiffness,...
Based on the nonlinear dynamic explicit finite element software LS-DYNA 3D, the parameters of detonator and Constitutive models of air, fragment and the Phased Array Radar Antenna Equivalent panel were ascertained. Numerical Simulation of target multiplex damage of fragment and shock wave was processed. The simulation results of shock wave overpressure, the board plastic deformation and the camber...
Firstly, this paper conducted the failure modes and effects analysis (FMEA) for the certain hydraulic system; secondly, it calculated the impact load of the hydraulic system when it works; and based on above results of FMEA and the calculation of impact load, it has made the finite element analysis to key components in Abaqus which caused most failures. Finally, it optimized the design of the sealing...
The behaviour of skin is still not well understood and characterising skin properties is always challenging due to its complex biological structure. Nevertheless, this paper highlights the success of determining skin material parameters using Ogden's model and finite element (FE) simulation. The approach involved integrating experiment, FE modelling and inverse-FE analysis. Data from in vivo experiments...
To reduce the weight of bracket and production cost of the naval gun, the aluminum board welded structure is used. The strength check analysis must be conducted for the fire safety. Firstly, based on the three-dimensional CAD model of the bracket and according to the design date, the geometry of model was simplified. Secondly, the FEM model of the bracket was built with the FEM software MSC. Patran,...
A new design for a dielectric elastomer actuator with geometrically confining reinforcements is presented. The resulting structures enable complex 3-dimentional motion without the need of the membrane prestretch. An in situ imaging system is used to capture the complex deformation pattern to evaluate the surface curvatures. The deformation mode is analyzed analytically using the bi-laminate theory...
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