This article presents a comprehensive analysis on the end winding vibration characteristics due to different stator inter-turn short circuit (SISC) positions in synchronous generators. Different from other studies, this not only pays attention effect of SISC electromagnetic forces, but also considers impact position, which is related static air-gap eccentricity, vibrations at meantime. The whole work based qualitatively theoretical analysis, finite element (FEA), and experimental validation...

Alkalides with large nonlinear optical (NLO) responses exhibit broad applications in the electro-optical device field. In present work, based on alkali (Li and Na) conjunction alkaline-earth (Ca) atoms doped into facially polarized all-cis 1,2,3,4,5,6-hexafluorocyclohexane (C6F6H6), we first reported two Janus-type alkalides as an external electric field (EEF)-induced second order NLO switches M–LCaL–M (M = Li or Na, L C6F6H6). The 4s electrons of Ca atom are, respectively, pushed out by...

This paper mainly focuses on the impact of inclined static air gap eccentricity (ISAGE) electromagnetic characteristics and mechanical performances (vibration, deformation, strain stress). Considering different ISAGE fault types in theoretical finite element analysis (FEA) model synchronous generators, effects intersection position rotor center axis stator axis, angle, combination previous two MFD, phase current radial magnetic pulling per unit area (MPPUA) are analyzed compared. Then, based...

Humanoid robot is anticipated to serve people in our daily life the near future. However, great cost of falling damage needs be addressed before it widely used. In this paper, a safe and compact joint with torque limiter developed reduce humanoid during falling. First, overall scheme design working principles are investigated. Then, mechanical presented details. Finally, effectiveness verified by several simulations.

The static air gap eccentricity is one of the prevalent faults in permanent magnet synchronous generators. In previous studies, variation magnetic flux density, stator current and vibration have been studied mostly. However, temperature characteristic winding insulation under 3D fault rarely investigated. As a supplement, this paper comprehensively analyzes influence radial eccentricity, axial combined (radial eccentricity) on thermal response. whole work based not only loss core windings...

Abstract In this study, the rotor loss as well temperature variations due to static air‐gap eccentricity (SAGE) and inter‐turn short circuit (RISC) in synchronous generators is presented. Different from previous studies, study investigates loss/temperature changes under not only single SAGE fault RISC but also combined faults (CF) that are composed of these two faults. Detailed formula derivation on hysteresis (HL) eddy current (ECL), together with rise varied types different operating...

A fast and accurate model to calculate the fluid-film forces of a bearing with Reynolds boundary condition is presented in paper by using free theory variational method. The applied nonlinear dynamical behavior analysis rigid rotor elliptical support. Both balanced unbalanced rotors are taken into consideration. Numerical simulations show that undergoes supercritical Hopf bifurcation as spin speed increases. investigation indicates motion can be synchronous motion, subharmonic quasi-period...

Abstract This article has conducted a comprehensive study on the stator and rotor vibration characteristics of doubly‐fed induction generator (DFIG) in case radial air gap eccentricity (RAGE). Differently from other previous studies, this paper not only investigates static (RSAGE) dynamic air‐gap (RDAGE) fault but also takes hybrid (RHAGE) into account. Through theoretical derivation, detailed expressions magnetic pull per unit area (MPPUA) unbalanced (UMP) are obtained. The finite element...

Summary Claddings are susceptible to damage due underestimation of extreme wind‐induced surface pressures. Commonly accepted methods for estimating the peak factor (an input used determine cladding design loads) involve complex calculation‐intensive procedures. This research develops a four‐parameter unified auto‐spectral model wind pressure simplify estimation via analysis tunnel load data on tri‐centered cylindrical roofs. Values parameters were identified statistical measurement two...

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This paper proposes a novel magnet-axis-shifting IPM (MAS-IPM) machine with asymmetric magnet distributions for traction applications. With asymmetrical PM distribution and adjustment of air space barriers width the rotor, MAS effect can be achieved to make reluctance torque components reach their peaks at closer current angles. The operating principle topology derivation proposed MAS-IPM are introduced first, open-circuit field is utilized reveal clearly. In addition, design optimization...

This paper presents a designed experimental simulation scheme for dynamic air gap eccentricity (DAGE) faults in permanent magnet synchronous generator (PMSG), along with the testing of their electromechanical characteristics. Unlike previous studies, this proposes and applies an device setting that enables accurate convenient calibration DAGE fault degree, offering novel solution practical simulation. The unit measures characteristics PMSG before after fault, taking into account influence...

Through the finite element simulation of semi-rigid connection steel frame with deep beam under horizontal cyclic loading,by changing parameters such as thickness end platedepth-thickness ratio beam, we can obtained load-displacement curveslateral stiffness structure yield capacity and ultimate capacity.The results show that: joints deformed not obvious during entire loading process because set beam;semi-rigid effective control lateral structure, reducing ductility nodes required;this type...

The presence of complex buildings introduces interference effects and complicates the wind field around long-span roof structure. complexity problem makes it challenging to predict load structures, resulting in a scarcity design data available engineers designers. Thus, influence effect on mean peak pressure coefficients tri-centered cylindrical structure was investigated through tunnel tests conducted an atmospheric boundary layer tunnel. study focused caused by cooling tower some low-rise...