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The paper presents the failure mode of high-power light emitting diodes (LEDs) under mechanical pressure and verifies the bonding wire as the weakest structure of LEDs. Different lens radiuses and heights are studied to demonstrate the influence of lens parameters on the mechanical strength of LEDs. The experimental results have demonstrated that a LED device has a higher failure force when the lens...
Power flow study is a fundamental task of power system operation and planning. Of the several methods developed in commercial package for power flow study, the Newton-Raphson method is the most successful one. It is however well recognized that the NR method may diverge in power flow study. In this paper, we numerically study the convergence regions of power flow solutions using Newton-Raphson(NR)...
On the basis of the continuum damage mechanics, a new low cycle fatigue damage accumulation model, which takes the coupling effect of damage and strain into account, is proposed. The model has some practical values because of its clear physical meanings. With the analysis of low-cycle test data for a kind of material often used in aero engine, we know that the prediction data derived from this new...
The subject of load modeling for bulk power system dynamic simulations has been received increasing attention in the past decades. The characteristics and models of the common load components are foundations to construct the accurate composite load models for power system dynamic stability studies. The power system common used load components, the load classes and the main load components in power...
Due to huge number of triangles are produced when CAD model converts to graphics model that making use of the current data interface, it can't meet the requirement of real time rendering in virtual reality system. In this paper, a novel approach about CAD model's simplification and conversion was proposed. The geometry data of CAD models was simplified by reduction algorithm and then converted to...
A series of electricity blackouts happened worldwide in the recent years, the simulations indicated that the load models used could not present the reality. Therefore, load modeling is recognized to be very important and receiving more and more attention in China. This paper describes the load modeling situation in China. At first, the research work is reviewed, including load model structure, methodologies...
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