Search

Your search keyword '"Du, Wenhao"' showing total 9 results
Start Over Author "Du, Wenhao" Publisher ieee
9 results on '"Du, Wenhao"'

6. Optimization of garlic digging shovel parameters based on EDEM and quadratic regression orthogonal rotation combination design

Author

Liu Cheng, Meng Xianjiang, Huang Weitao, Zhao Dong, DU Wenhao, and Kong Linghui

Subjects
Polynomial regression, Digging, business.product_category, business.industry, Sharp angle, Orthogonal rotation, Regression analysis, Structural engineering, Shovel, business, Mathematics
Abstract

In this paper, the resistance of garlic digging shovel was used as target, the simulation experiment scheme was designed by quadratic regression orthogonal rotation combination, and the parameters of garlic digging shovel were optimized by EDEM simulation. The regression equation for the resistance of garlic digging shovel was established based on the simulation experiment results. According to the regression equation, the primary and secondary influences of the factors on the resistance were shown as below: the width, length and sharp angle of the shovel had a significant influence on the resistance of the garlic digging shovel; the width of the shovel was greater than the length of the shovel; the length of the shovel was greater than the angle of the shovel; and the angle of the shovel is greater than the speed of the shovel.

Published
2020

8. Thermal response properties and surface insulation failure mechanism of epoxy resin under arc ablation.

Author

Yin, Ze, Sun, Potao, Sima, Wenxia, Li, Licheng, Du, Wenhao, and Sui, Huaze

Subjects
EPOXY resins, THERMAL properties, SURFACE charges, SURFACE properties, VACUUM arcs, MOLECULAR orientation, PERMITTIVITY
Abstract

Arc ablation during the operation of HVDC circuit breakers can cause irreversible damage to the epoxy resin (EP) insulation pull rod. This is one of the critical factors that affect the reliability and lifetime of a HVDC circuit breaker. In this work, we built an arc ablation experimental platform and studied the thermal response properties of EP insulation under arc ablation. The surface charge evolution characteristics and the dielectric properties were analyzed to reveal the underlying surface insulation failure mechanism of EP after arc ablation. The results indicate that arc ablation can cause severe carbonization to EP insulation. With increasing arc duration, the EP gradually transforms into carbide and pore products. Arc ablation can decrease the molecular moment orientation polarizability and the relative dielectric constant of EP insulation, and thereby increasing the current density formed by Schottky injection. Therefore, when the external electric field is applied, the charge on EP insulation surface migrates from high voltage electrode to the ablating area, causing the regional accumulation of surface charge and the formation of local failure area. This can decrease the surface electrical performance of EP insulation and lead to insulation failure finally. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results