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The traditional high-order staggered-grid finite-difference (SGFD) method has high-order accuracy in space, but only the second-order accuracy in time, which makes the traditional SGFD method suffer from a large temporal dispersion error during long-distance wave propagation. This paper develops temporal fourth- and sixth-order and spatial arbitrary evenorder SGFD schemes to model isotropic elastic...
Computational models with variable fidelity have been widely used in engineering design. To make a trade-off between high accuracy and low expense, variable fidelity (VF) metamodeling approaches that aim to integrate information from both low fidelity (LF) and high-fidelity (HF) models have gained increasing popularity. In this paper an active learning variable-fidelity (VF) metamodeling approach...
For a power grid integrated with wind farms, power output predication of wind turbines would influence the accessibility as well as its economy of dispatch schemes. We applied the GARCH algorithm into construct wind speed model, which has excellent characteristics to tracing the variation of the fluctuated time series. With power curve versus wind speed, wind power is easily gotten by putting the...
Wind power forecasting is one of the key technical issues for a power system integrated with a large amount of wind farms. Based on analysis of the variation characteristics of wind speed, we applied econometrics theory into the modeling of wind speed, since GARCH has an excellent performance to tracing the variation of those fluctuating sequences. Using the wind power curve, the power output of a...
Power sector restructuring has prompted the application of modern portfolio theory among market participants. Much research has been devoted to power portfolio optimization problems. However, the portfolio composition adopted in literature is rather hypothetical than realistic. From an engineering perspective, it is necessary to use real traded contract products to construct the portfolio. In this...
The numerical simulation was carried out by building methane-diesel fuel model at the base of physical model and basic control equation of hydrodynamics, by adopting non-premix combustion method, by simplifying combustion as blends, and by calculating blend fraction. Furthermore, its combustion press field, temperature field and velocity field were analysed. Finally, the experimental results indicated...
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