Human–desertification coupling relationship in a karst region of China

2021 ◽  
Author(s):  
Erqi Xu ◽  
Hongqi Zhang
Keyword(s):  
Karst Region ◽  
Coupling Relationship

Modeling and suppression of unbalanced radial force for in-wheel motor driving system

2021 ◽  
pp. 107754632110260
Author(s):  
Zhaoxue Deng ◽  
Xu Li ◽  
Tianqin Liu ◽  
Shuen Zhao
Keyword(s):  
Electromagnetic Force ◽  
Switched Reluctance Motor ◽  
Radial Force ◽  
Force Amplitude ◽  
Switched Reluctance ◽  
Driving System ◽  
Coupling Relationship ◽  
Force Fluctuation ◽  
Reluctance Motor ◽  
Road Excitation

Considering the negative vertical dynamics effect of switched reluctance motor on an in-wheel motor driving system, this article presents a modeling and suppression method for unbalanced radial force of the in-wheel motor driving system. To tease out the coupling relationship within the in-wheel motor driving system, this investigation, respectively, explores the principle of unbalanced radial force and the coupling relationship between rotor eccentricity and road excitation based on the suspension response model with unbalanced radial force under road excitation. The switched reluctance motor nonlinear analytical model was fitted by the Fourier series, and its radial electromagnetic force was modeled and analyzed by the Maxwell stress tensor method. To mitigate the influence of radial electromagnetic force fluctuation and unbalanced radial force amplitude value under eccentricity condition on the in-wheel motor driving system, the elitist non-dominated sorting genetic algorithm was adopted to improve radial electromagnetic force fluctuation and unbalanced radial force amplitude value of the switched reluctance motor. The simulation results show that the proposed optimization method can suppress the radial electromagnetic force fluctuation and unbalanced radial force amplitude value, and the negative effect of vertical dynamics of the in-wheel motor driving system is conspicuously mitigated.

scholarly journals Soil moisture responses under different vegetation types to winter rainfall events in a humid karst region

2021 ◽  
Author(s):  
Weihong Yan ◽  
Qiuwen Zhou ◽  
Dawei Peng ◽  
Xiaocha Wei ◽  
Xin Tang ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Karst Region ◽  
Vegetation Types ◽  
Winter Rainfall ◽  
Rainfall Events

The production processes and characteristics of nitrogen pollution in bare sloping farmland in a karst region

2019 ◽  
Vol 26 (26) ◽  
pp. 26900-26911 ◽  
Author(s):  
Ruxue Gao ◽  
Quanhou Dai ◽  
Yixian Gan ◽  
Xudong Peng ◽  
Youjin Yan
Keyword(s):  
Nitrogen Pollution ◽  
Karst Region ◽  
Production Processes ◽  
Sloping Farmland
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