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Nonlocal-integro-vibro analysis of vertically aligned monolayered nonuniform FGM nanorods
Yuan Yuan,Ke Zhao,Yafei Zhao,Keivan Kiani 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.37 No.5
Vibration of vertically aligned-monolayered-nonuniform nanorods consist of functionally graded materials with elastic supports has not been investigated yet. To fill this gap, the problem is examined using the elasticity theories of Eringen and Gurtin-Murdoch. The geometrical and mechanical properties of the surface layer and the bulk are allowed to vary arbitrarily across the length. The nonlocal-surface energy-based governing equations are established using differential-type and integro-type formulations, and solved by employing the Galerkin method by exploiting admissible modes approach and element-free Galerkin (EFG). Through various comparison studies, the effectiveness of the EFG in capturing both nonlocal-differential/integro-based frequencies is proved. A constructive parametric study is also conducted, and the roles of nanorods’ diameter, length, stiffness of both inter-rod’s elastic layer and elastic supports, power-law index of both constituent materials and geometry, nonlocal and surface effects on the dominant frequencies are revealed.
Electrostatic Discharge Characteristics of Cable Discharge Event
Yu Zhang,Yafei Yuan,Xiaoqing Li,Ming Yang,Na Feng,Ziwei Lu,Jihao He,Qizheng Ji 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
The characteristics of cable electrostatic discharge event are investigated, which has been proved to be a hazard leading to ESD damage. The electrostatic voltage under operations on cable is measured and the effects of the discharge parameters including electrostatic voltage, cable length, cable type and the distance to the ground on cable discharge event (CDE) are studied experimentally. The CDE current waveform appears as a sequence of oscillating rectangular pulses with fast rising time, short pulse width but high amplitude. The current amplitude linearly increases with the electrostatic voltage, while the pulse width is mainly determined by the cable length. The distance to the ground and the cable type has little influence once the distance is relatively large. The discharge by cable with multiple cores is also investigated. Theoretical discussion is made to explain the phenomenon and its mechanism.