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In this paper, a trending concept of module-integrated converter called as photovoltaic (PV) balancers is presented and verified on a practical data of solar PV system. This concept enables the maximum power point tracking for each module, which historically reduces the requirements for traditional power converters and significant economical impact on overall configuration of solar PV systems. In...
This paper presents design and simulation of a piezoelectric cantilever beam for energy harvesting using mechanical ambient vibration. Ambient vibration energy used by the developed piezoelectric cantilever beam can be converted into electrical energy using piezoelectric effect as a piezoelectric energy harvester. The piezoelectric cantilever beam was consisted of copper substrate, two piezoelectric...
It was suggested that electromigration (EM) life of solder can be improved by proper choice of stress property (compressive or tensile) at the two corners where electron current enter and exit. In this paper, we investigated this problem systematically by experiment and finite element simulation. The experimental results show that, compared with the case of tensile stress, the meantime to failure...
Space charge accumulation causes electric field distortion and affects the insulation aging. It is an interesting phenomenon that space charge behavior is influenced by the contact interface even between two insulations of the same materials (with the same conductivity and dielectric constant). To study such effect, a simple case was studied. Two low-density polyethylene (LDPE) plates were made by...
The aim of this research is the design and analysis of underwater housings made of ultra-high performance concrete (UHPC) within the Helmholtz Alliance “ROBEX” (robotic exploration of extreme environments) [1]. Due to the extremely corrosive maritime environment, mainly expensive materials such as titanium, ceramics, special stainless steel and aluminum are used so far for the construction of temporary...
Shock and vibration from the rocket launch brought high demands for the design of space robot. This article describes the simulation and design optimization on a six degree of freedom space manipulator we had designed for space robot. Firstly, the article describes the configuration design, Denavit-Hartenberg parameters, and so on. Then, based on the mechanical requirements of rocket to payload, mechanical...
The reliability and stability of electrical interconnections are of utmost significant things for electrical connector which plays a great role in the signal transmission and control. The objective of this study has investigated in the relationships between the insertion force and two parameters (convergent angle and concentricity) of a kind of electrical connector by Abaqus software. According to...
Sensitivity analysis of power grids to cascading failures by means of considering their critical dependence on their operating characteristics is an important step toward understanding and mitigating cascading failures. In this paper, a recently reported probabilistic cascading-failure model is further analyzed to provide key evidence that the reliability of power grids critically depends on operating...
In this paper a 2 MW dc-dc converter is presented and design criteria are carried out. It deals with the preliminary design for the hardware implementation. The power supply shall have multiple targets such as an PV emulator or supply for a dc-micro grid in the research facility National Center for Reliable Electric Power Transmission of the University of Arkansas. The converter is designed for an...
In the last three decades with the Information Technologies advent and the growth of the concept of Virtual Environments, a set of new ways to perform tasks have emerged, in the most diversified areas of society. The main focus of this work was to verify if it was possible to increase the sense of presence through multi-sensory stimulation, creating a virtual environment of simulation that causes...
Magneto-elastic materials exhibiting considerable magnetostriction are nowadays being used in a wide spectrum of applications including electrical energy harvesting from mechanical vibrations, active mechanical vibration damping, sensors and fine positioning actuators. Generally, properties of such materials are non-single-valued and history dependent. Hence, incorporation of accurate hysteresis models...
In this paper, a new dual output DC-DC converter is proposed. This topology is achieved from another dual output dc-dc converter with a little change. Conventional dual output converters provide two same level voltages in the outputs; but this topology provide two different voltage levels. In this topology, one of the output voltage gain has a considerable increment. This topology, uses two switches...
Measurement and simulation of the stress state in the silicon die of a wafer-level fan out package can be difficult due to the complexity of high density packaging structures and the uncertainties in material properties at the nanoscale, yet these stresses directly affect the electrical behavior of the embedded active devices due to the piezoresistive effect in silicon. In this study, the residual...
The Embedded die in substrate (EDS) market has grown significantly over the past several years and it is now one of the fastest growing packaging technologies in the semiconductor industry driven by smaller form factor, better heat dissipating, low noise emission, higher levels of integration and better performance. In addition, for power management and mobile-wireless application the embedded technology...
Sintered metals are considered to be high temperature die bonding materials for SiC power devices. Thermal cycling tests have shown that sintered copper is expected to achieve excellent lifetime properties, especially as compared to sintered silver. However, the mechanism behind this has not yet been confirmed. To clarify the mechanism, it is necessary to know the basic strengths of sintered metals,...
This paper presents a novel generalized topology of a multilevel inverter. The proposed topology is obtained by extending the developed H-bridge topology. The proposed topology is competent to generate the optimum number of output voltage levels by using minimum number of dc voltage sources. The topology offers reduced value of voltage stress on semiconductor power switches. Utilization of dc voltage...
To develop a computer-aided monitoring system for proactive control over the bodies subjected to hydrostatic pressure, it is necessary to know the areas under the maximum shear stress. These stress concentrators can be determined via the finite-element method aided by CAD systems. This paper proposes to use various CAD systems for developing the initial stage of computer-aided monitoring, giving the...
In this paper we present structural simulation of 10×10 mm anodic aluminum oxide (AAO) membrane having thickness 0.5 mm by using ANSYS, that is finite element method based simulation software. AAO membranes have been used for various applications including hemodialysis, one of the most important applications in serving mankind. As the membrane is exposed to certain values of pressure during hemodialysis...
Mechanical stress has the potential to be an efficient performance booster for diverse emerging research devices based on tunneling phenomena, such as tunnel FETs, resonant tunnel FETs and reconfigurable FETs. The effect is highly dependent on the constellation between the stress source and the crystal orientation. Although stress engineering is well established for enhancement carrier mobility, it...
With the application and development of electronic devices, the electromagnetic energy in our surrounding space is gaining rapidly. Especially for those aviation electronic products in the limited space, their characters, such as variety, high density, sensitivity and power, make them susceptible to electromagnetic interference. Traditional electromagnetic compliance (EMC) analysis focuses on EMC...
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