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300W end-pump power deposited as heat is predicted to cause a thermal damage for doped double clad fiber (DDCF). In order to estimate cooling effects of DDCF through radiator, the general equation has been solved with a thermal convection boundary under a rectangular plate at the periphery. Steady-state thermal profiles are developed using both a full numerical solution and an analytic approximation...
this paper presents a disturbance rejection control methodology for the course keeping of a fully-submerged hydrofoil craft. The course keeping dynamics of the fully-submerged hydrofoil craft with parameter perturbation is firstly analyzed. Then an extended disturbance observer (EDO) is developed to make real time estimate of the disturbance as well as the model uncertainties. A nonsingular terminal...
Solder is widely used in electronic packaging to connect die and substrate in die attach process. It is important to get a uniform solder distribution to provide good electrical conductivity, mechanical support as well as excellent thermal properties for packages, especially for power packages with high current densities. While nonuniform solder distribution would emerge when die moves and tilts in...
The longitudinal motion of wave-piercing catamaran can be easily affected by random waves and become rapid when running at high speed. Besides, there are nonlinear factors and parameter perturbation in the mathematical model, strategy of designing pitching/heaving motion H∞ robust fuzzy control is proposed based on huge wave piercing catamaran T-S fuzzy model. Both the proof of related theorem and...
A white LED modeling method is proposed to implement the colorimetric simulation and a novel LED packaging integrated with a specific freeform lens is designed to realize t he high-quality light outp ut. High angula r color uniformity (ACU) is achieved by mixing the central bluish white light and the marginal yellowish white light via the specific freeform lens. Based on the white LED modeling method,...
We propose to combine symbolic execution with volume computation to compute the exact execution frequency of program paths and branches. Given a path, we use symbolic execution to obtain the path condition which is a set of constraints; then we use volume computation to obtain the size of the solution space for the constraints. With such a methodology and supporting tools, we can decide which paths...
A finite element model which includes electromigration, thermomigration, stress migration and concentration diffusion is established to study the mass diffusion phenomenon. Numerical experiment is carried out to obtain the electrical, thermal, stress and atomic concentration fields of the sweat and through silicon via (TSV) structure under high current density load. The effectiveness of the electromigration...
A nonlinear transient heat transfer finite element model based on commercial finite element software, ABAQUS, is developed to simulate the curing process of silicone adhesive. The curing reaction process and specific heat of the silicone adhesive were investigated using a differential scanning calorimetry (DSC) to obtain material parameters for numerical simulations. Curing reaction kinetics was derived...
Numerical study of the slurry gasification process inside of Texaco entrained-flow coal gasifier was carried out in this paper. The Eulerian-Lagrangian approach was used for calculating the gas-solid two-phase flow. And the complicated slurry gasification process was divided into several stages, such as slurry-water evaporation, coal devolatilization, heterogeneous reactions and homogeneous reactions,...
Optical analysis is critical to the evaluation of an LED MR16 lamp, especially when the lamp is still in its early stage of development and applications and when optimization is needed for making use of unique characteristics of LEDs. In this study, optical research of a 3W LED MR16 lamp was conducted. The experimental results demonstrated that the LED MR16 lamppsilas angle of full width at half intensity...
High power LED packaging is crucial for the development of solid state lighting. Different optical structures with various states of phosphor will greatly influence the packaging performance such as luminous efficiency, quality of white light and color uniformity. Through the analysis of five different optical structures, it is found that the location of phosphor layer has low impact on the light...
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