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The effect of temperature gradient on space charge behavior is necessary to investigate for HVDC insulation. In this paper, space charge distributions in neat epoxy resin (EP) and EP/SiO2 nanocomposites (NC) were measured under different DC stresses and temperature gradients. We found that different temperature conditions applied to the electrodes had a great impact on space charge distributions:...
A Hybrid RANS/LES 3D unsteady numerical simulation of aerodynamic noise of NREL PHASE VI wind turbine at the wind speed of 7 m/s was performed with commercial CFD software ANSYS FLUENT, in which LES turbulence model was applied to analyze the aerodynamic noise of the wind turbine combining with FW/H model. But numerical simulation of aerodynamic noise performed with the similar method of the NACA0018...
To facilitate the research of mobile robot based odor source localization (OSL) and evaluate different strategies for the OSL, numerical simulation of odor plume in indoor ventilated environments is addressed. On the basis of the FLUENT software package, the 3-D wind field of an indoor ventilated environment is calculated using the Reynolds average approach, where the real wind velocity measured by...
Screw-driven clamping fixture, it's external or internal force and deformation may be the direct cause of manufacturing precision, is one of absolutely necessary parts for manufacturing process. An effective way of predicting the movement and force of the screw-driven clamping is proposed in this paper based on mathematical methods and numerical simulation. As an example, a kind of screw-driven fixture...
In order to measure high accuracy or mid spatial frequency optical surfaces, this study investigated imaging system in Fizeau interferometer. Interferometer is a transferring phase information system. General transfer function can't evaluate the ability of imaging system in interferometer that transfers the phase information of the optical surface. So this paper deduced instrument transfer function...
A numerical simulation model for the sequential turbo charging (STC) diesel engine was established by STAR-CD and the initial boundary condition of the model was calculated by the GT-POWER. The experiment results were compared to multi-dimensional model results. Based on the model, the effects on the combustion process and the NOx emissions, including inject cone angle and inject timing were studied...
The problem of maneuvering target tracking is addressed in this paper. Based on the 'current' statistical model, two-structured stochastic jump system is constructed in which the acceleration covariance switching to each other. The parameters are estimated with optimal stochastic jump filtering algorithm, and the tracking ability is improved much more after using the covariance non-linear adjustment...
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