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Due to highly nonlinear material characteristics in combination with electrical-thermal coupled partial differential equations and the complex geometry the design of stress grading systems for large rotating machines is a difficult and time consuming process. In order to accelerate this process, a finite element model is developed. The model takes the nonlinear electrical and thermal coupled material...
Three-dimension (3D) integration provides a promising approach to build complex microsystems through bonding and interconnection of individually optimized device layers without sacrificing system performance. The use of traditional underfill processes is expected to suffer an arduous challenge as the filled gap of a large scale chip is narrowed down to several micrometers. Consequently, the subsequent...
Ensuring reliability of interfaces of dissimilar materials is one of the most critical design aspects of electronic assemblies. A study on the interface delamination phenomenon of different power packages was undertaken. Thermally induced stresses caused by the thermal mismatch between molding compound (MC), Si-die, and Cu- heatsink act as combined shear and normal loadings on the respective interfaces...
In this paper, finite element modeling of anomalous moisture diffusion using commercial finite element code is developed. The modeling method and numerical implementation is based on a dual stage model with both stages described by Fickian terms mathematically. The method is also extended to desorption process at reflow, in which the permanently trapped moisture content is a function of temperature...
Using the ANSYS finite element analysis software to establish a SOLID92 as the basic unit of the finite element model. We use ANSYS to analysis the Qianjiaying of Tangshan coal mine shaft sheave, from the quiet intensity of the head sheave to evaluate its safety. It will give reasonable advice for the similar design.
The frame three-dimensional entity model of a formula racing car is established on CATIA software platform, and is analyzed by finite element through the ANSYS software. Through the analysis of the static typical working conditions of the frame (bending and torsion conditions of the frame), find the affluent parts of the strength and stiffness of the frame, reduce the number of pipe fittings and diminish...
The research for optimization tool of electrical machine has developed for decades. Permanent Magnet is a new addition in this arena. This paper describes the design of a direct-driven generator designed with Emetor and Flux 2D. The initial analytical design is done with Emetor. Then the experimented result is verified with a FEM (Finite Element Method) simulation software from Cedrat group named...
Analytical characterization of a switched reluctance motor (SRM) by means of magnetic circuit theory can be a tedious task. Specific software based on the finite elements method (FEM) for solving non linear magneto-static problems has proved very useful for this characterization. However, to solve the Maxwell equations it is necessary first to know the magnetization curve of the material used for...
In this paper we develop an immersed interface finite element(IFE) method based on rectangular mesh for a kind of anisotropy diffusion models which is governed by an elliptic interface problem with discontinuous tensor-coefficients. The method is based on bilinear polynomials on non-interface rectangular elements and piecewise bilinear polynomials on interface rectangular elements. We prove that a...
Mechanical engineers always expect to design a structure which could work properly in its whole lifetime. But there exist many random factors, such as dimension, material property and applied forces. Hence structures based on determinate design could fail with high probability. Reliability-based Topology Optimization (RBTO) is a computer-automated design method which combines reliability analysis...
Quite a few tasks focusing on failures of electronic components caused by vibrations have shown that a satisfactory depth of problem analysis cannot be achieved with existing problem-solving methods. Thus, new options supported by computing power have been investigated which make evaluating the stress and reliability of electronic components subject to vibrations faster and more reliable. The paper...
Crankshaft is the most important moving part of diesel engine, and bears secular cyclic dynamic loads. In this paper, fatigue life prediction modeling and residue life assessment based on statistics of historical working state (SHWS) is conducted at crankshaft using fatigue damage accumulation (FDA) theory. First, its dynamic response of typical operation performance is analyzed with software ANSYS...
Orthodontic braces are used to modify, malocclusions of teeth and jaws. Most of problems in dentistry can be investigated from a biomechanical point of view. Stress distribution in bracket, adhesive and tooth has been used as a criterion to determine bond strength of bracket- adhesive- tooth system. Tooth is consisted of three layers including enamel, dentin and pulp with three different mechanical...
With the quick development of electronic products, IC chip with more functionalities, higher performance, miniaturization, higher reliability and lower cost have been requested intensely, especially in portable device domain such as cell phone, camera, notebook. Based on that, the electrical product using CSP series such as WLCSP, TFBGA, QFN etc. need further evaluation to meet those requirements.
Sub-mm CMUT annular arrays are very attractive for generating high quality imaging beams with a small channel count for intravascular imaging. In this work, we analyzed the performance of 840 µm diameter, 40 MHz CMUT annular arrays using analytical and FEA methods. We experimentally characterized several types of RTV films at high frequencies as protective coatings and evaluated their effect on the...
The paper presents the result of studies and investigations related to planar thermoelectric generators, intended to be realized through printing technologies. The recent development in printing technologies and materials makes possible the realization of thermoelectric pairs in planar configuration as an alternative to the already used devices. The use of printing technologies permits the realization...
Mechanical reliability of epoxy molding compounds in plastic packages of integrated circuits (IC) is greatly affected by the compound ability to absorb moisture. In this paper, the hygro-thermal effect of a 2-layer stacked die package was investigated which emphasized on the hygroscopic stress and thermal mismatch stress. By finite element analysis (FEA), the distribution of moisture diffusion, thermo-mechanical...
Diagnostic systems based on mathematical models of material damaging process can be used to collect necessary information on trends and/or level of material and function damage. This paper is focused on the improvement of a particular part of the power plant diagnostic system. It describes some alternatives based on Artifical Neural Networks and Self-Organising Maps. Finally, this can help to eliminate...
The problems faced by humanity cannot be solved with old technologies. Most scalable solutions need advanced and emerging technologies that are creatively blended with the existing and rapidly evolving infrastructure. One such problem that is being addressed is the illiteracy that is prevalent in several parts of the world. There are an estimated 200 million adults in India who are not literate. At...
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