This paper proposes the stiffness nonlinearities and asymmetric SD (smooth discontinuous) oscillator under time-delayed feedback control with fractional derivative damping. With effect of displacement velocity feedback, can be adjusted to desired vibration state, then stochastic resonance (SR) is achieved. article discusses contribution various system parameters SR, especially which induced by ...

field observations of the incurred damages to the buildings and bridges due to earthquakes in near field show there are various failure modes which are in relation to the forces caused by vertical component. while vertical component of earthquake for ordinary buildings in most seismic regulations and standards is not considered. therefore, in the current study the effects of vertical and horizo...

Double Fed Induction Generator; Crowbar protection; ANFIS; Fuzzy logic; Fault current and voltages Abstract In the last 15 years, Double Fed Induction Generator (DFIG) had been widely used as a wind turbine generator, due its various advantages especially low generation cost so it becomes the most important and promising sources of renewable energy. This work focuses on studying of using DFIG a...

Converter-interfaced renewable energy sources (CIRESs) may have a different fault current angle with synchronous generators (SGs), so the large difference on both sides will cause low sensitivity or failure for traditional proportional braking differential protection. So as to cope this issue, new control strategy is put forward. By analyzing phasor diagram during asymmetric faults, reasonable ...

Samples of fault gouge from the San Andreas Fault drill hole (SAFOD), a shale from the North Sea sedimentary basin and schists from metamorphic rocks in the Alps have been analyzed with high energy synchrotron X-rays to determine preferred orientation of mica and clay minerals. The method relies on obtaining 2D diffraction images which are then processed with the crystallographic Rietveld metho...

[1] Building upon previous laboratory earthquake experiments of dynamic shear rupture growth taking place along faults with simple kinks, new and complex fault geometries involving cohesively held fault branches are studied. Asymmetric impact at the specimen boundaries controls the incoming shear ruptures, which are manipulated to propagate at either sub-Rayleigh or supershear velocities. High-...

Modular multilevel converter (MMC) is a key device of high-voltage-direct circuit (HVDC) transmission system, the sub-module detection technology which will directly influence damage severity, and even reliability whole system. In this paper, open-circuit fault characteristics an insulated gate bipolar transistor (IGBT) in are analyzed, fault-tolerant optimal control strategy proposed for redun...

[1] We utilize seismic converted phases on more than 700 receiver functions calculated for 42 stations in the South Island, New Zealand, to infer crustal and uppermost mantle structure. We determine the crustal thickness from direct observations of conversion from the Moho interface and infer zone of the maximum thickness being located along the axis of the Southern Alps, just east from the Alp...