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In this paper the validity of a finite element method based analysis tool, ElecNet software, has been demonstrated to calculate the electric field distribution in high voltage surge arresters. First, a one column porcelain surge arrester model described in IEC 60099-4, Annex L was simulated with ElecNet. The calculation results were then compared with the modeling results published in IEC 60099-4...
In order to protect museum display artworks, an artwork is taken as an example to study its inner force as well as motion status after it falls down and collides with the floor. Based on theoretical equations, simulation model for both artwork and floor is built. By simulation mises stress distribution as well as displacement, velocity and acceleration response curves for both artwork and floor are...
A Self-deployment algorithm with Two-step Potential Field for the directional sensing model of Dynamic Vision Sensor Networks (DVSNs) is proposed in the paper. At first, the nodes are deployed randomly, and uniformly distributed in the monitoring area with virtual potential field at the first-step. Then, adjust the direction of sensor nodes to make the centroid points distribute uniformly at the second...
Power domain crossing circuits, also known as internal I/O's, are susceptible to gate oxide damage during charged device model (CDM) events. Circuit-level simulations of internal I/O circuits along with elements representing the package, electro-static discharge (ESD) circuits and the substrate, elucidate the roles of the package, power clamp placement, back-to-back diode placement and the decoupling...
In this work we present a detailed investigation of TANOS memory reliability, focusing on issues raised by Al2O3 trapping/detrapping and leakage. These effects are investigated as a function of alumina thickness, electric field and temperature, comparing experimental and modeling results for trap parameters extraction. For TANOS devices, Al2O3 charge storage modifies program and erase saturation level...
This paper presents a two-switch dual-buck grid-connected inverter with sinusoidal pulse-width modulation (SPWM) control and single current sensor. The freewheeling current flows through the independent diodes instead of the body diodes of the switches, so reverse recovery losses of the diodes can be reduced. Half of the power devices operate in high frequency at each half line cycle, and the others...
Rock jointed slopes are widely existed in geotechnical engineering, whose stability is the main content for design and construction. Recently, the limit equilibrium method is still mainly adopted to analyze the stability of jointed slope, in which the neither stress-strain relationship of rock mass, nor the deformation and stress response of rock mass in the jointed slope can be described well. Due...
Apply the finite element software of ANSYS/LS-DYNA to simulate the rolling process of pairs of cross wedge rolling shaft and to analysis the stress field of the rolling at the stage of stretcher and to analysis the distribution of strain field. what's more, it can make a clear analyss of the metal's situation such as the under force and the movement at the process of the rolling deformation, it has...
Apply the finite element software of ANSYS/LS-DYNA to simulate the rolling process of pairs of cross wedge rolling shaft and to analysis the stress field of the rolling at the stage of stretcher and to analysis the distribution of strain field. what's more, it can make a clear analyss of the metal's situation such as the under force and the movement at the process of the rolling deformation, it has...
The traditional glass drilling using mechanical processing and laser processing in air would produce many kinds of defects such as bugle, debris, crack and scorch. In this paper, we have applied the method of liquid-assisted laser processing (LALP) to reduce the temperature gradient, heat-affect zone region for achieving crack-free glass drilling. At the parameters of laser power 6 W, scanning speed...
The traditional glass forming using laser ablation in air would produce many kinds of defects such as bulge, debris, crack and scorch. In this paper, we have applied the method of PDMS assisted laser processing to reduce the temperature gradient, heat-affect zone region for achieving crack-free glass ablation. The laser power of 15 W, PDMS thickness of 150 μm and scanning speed of 228 and 342 mm/s...
In this paper the mathematical model of the MEMS disc element considering its width value is proposed. This model considers influence on disk resonance frequencies values of disk geometrical parameters. The first, second and third mode values were calculated. Stresses and stains in disc were simulated. Also in this work gives several proposition for future use of the analyses proposed for the telecommunication...
Around the simulation and experiment of the drilling process of the high manganese steel, the method to set up model and relevant theories has been studied in simulation course. Utilize plastic forming finite element software, material model of high manganese steel and geometric model have been built. The drilling processing of the high manganese steel has been simulated, continuous chip and the data...
Water jet incremental sheet metal forming is a new method of sheet metal forming. Based on the feature of forming, simulation model is established, mesh generation is carved up, boundary condition and constraint are set, deformation degree is calculated, and after deformation degree and stress analysis an experiment of water jet incremental sheet metal forming is done. By giving a test to forming...
High demand and poor staffing conditions cause avoidable pressure and stress among healthcare personnel which results in burnout symptoms and unplanned absenteeism which are hidden cost drivers. The work environment within an emergency department is commonly arranged in a flexible workload which is highly dynamic and complex for the outside observer. Using detailed simulation modeling within structured...
Through analysis of buckling and stress for a composite cylindrical shell, such technique targets as critical load, strength and stress distribution of 3D-braided composite cylindrical shells are calculated numerically. These results indicate that the effect of buckling to the 3D-braided composite CNGV is indubitable. Based on the 4-step 3-D circular braiding procedure and the theoretical analysis...
In this paper, a two-phase interleaved boost converter with low switch voltage stress and automatic current-sharing capability is proposed for single-phase power factor correction (PFC). First, a forward-type converter is integrated with the first phase to achieve much higher voltage conversion ratio and avoid operating at extreme duty ratio. Then, two capacitors are added as voltage dividers for...
Based on finite element method and genetic algorithms dynamic mathematical model is established, and the simulation of stress distribution around the defects of single crystal nickel-based superalloysis also established with ANSYS. After the change of stress field with time is analyzed, the result is compared with that achieved through numerical calculation and experimental analysis. The comparison...
In order to solve a series questions at present existing in machining technology of the disc with complex shape such as long process flow, great affects among working procedures and high cost, according to the outline of the part, the drawing process has been finished by one process instead of two, which is on the basic of the finite element numerical simulation and the experiment on simple dies....
Unlike traditional vibration platform, parallel microvibration platform can solve the problem of multi-dimensional vibration at the same time. Structural design was carried out by selecting three-translational parallel mechanism as the main mechanism, selecting flexible hinge without gap and friction as kinematical pair, and selecting reasonable piezoelectric actuator as driving component. According...
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