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The selection of experimental data points in response surface methods (RSMs) is still not based on precise guidelines or theory, and multicollinearity—defined as the presence of linear correlations among the uncertain variables—hinders the estimation of the regression coefficients. As a result, a local optimal solution may be obtained. Uniform experimental design (UD) is a quasi Monte Carlo simulations...
The switching in of renewable resources to micro-grids and the implementation of demand response strategy has made reliability evaluation of micro-grid become increasingly complex. This paper focuses on the influence of demand response strategy on micro-grid's reliability. The coordination degree between the micro-grid's new energies and loads can influence micro-grid's reliability and the utilization...
In order to study the influence of electrical collector system of wind farm from the perspective of four typical topological structures of electrical collector system of wind farm, sequential Monte Carlo model is established for reliability evaluation of electrical collector system of wind farm with consideration of multiple faults of wind turbine generator (WTG) and collection circuit in wind farms...
In recent years, services based on cloud computing have been used more and more widely. Stakeholders have paid more and more attention on the quality of cloud service. But most of them don't know how to evaluate the quality of cloud service. This paper proposes a comprehensive, structurized, and hierarchical quality model of cloud service, which concerned not only the IT features but also the service...
Cloud computing brings convenience for people to use IT resources, but also brings great challenges to the maintenance service of cloud computing environement. How to ensure the quality of maintenance service for cloud computing has become a problem. This paper proposes two models for quality management. One is the service quality management model for maintenance service. The other is the service...
Micro-grid technologies have greatly attracted attention due to quick development of distribution energy resources. Micro-grid studied by researchers primarily includes AC micro-grid, DC micro-grid and AC-DC hybrid micro-grid. The advantages and application of these three types of micro-grids have been introduced and analyzed in this paper. The grid architecture, energy management, operation control...
According to analysis results of the failure modes of side-abrasion of rod strings for water-flood pump wells and the application of probability statistical and reliability theory, this paper properly treated and selected the failure data, and deduced the lifetime statistical model, realized qualitative analysis and quantitative evaluation for the working reliability. Through building the side-abrasion...
Low cycle fatigue tests of eutectic solder alloy 63Sn37Pb were carried out over a wide range of temperatures (from 22degC to 125degC), and at each fixed temperature, different total strain ranges (from 1% to 10%) were loaded. The triangular waveform was employed for all the tests, and hysteresis loops data were automatically collected by data acquisition system. Relations between the maximum tensile...
A simplified BGA flip chip model was established based on Ansys software to investigate thermal stress in the solder joints. The thermal cycle dwell time, thermal cycle temperature range and the maximum dwell temperature were changed to observe their effects on the thermal fatigue life of solder joint; the length and thickness of substrate were also changed to research the dimension effect. The thermal...
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