1,774 research outputs found
Vibration measurement based condition monitoring
Vibrations of the transformers are complex multi-physics phenomena that require a deep understanding of electromagnetic and mechanical principles. Their analysis can be used to assess the condition of the transformer in terms of mechanical fixation quality, buckling or ageing of the components.
The article presents the 20 years of efforts of researchers in Xi\u27an Jiaotong University and The University of Queensland on transformer vibration characteristics and its application in the winding mechanical condition monitoring
Vibration measurement based condition monitoring
Vibrations of the transformers are complex multi-physics phenomena that require a deep understanding of electromagnetic and mechanical principles. Their analysis can be used to assess the condition of the transformer in terms of mechanical fixation quality, buckling or ageing of the components.
The article presents the 20 years of efforts of researchers in Xi\u27an Jiaotong University and The University of Queensland on transformer vibration characteristics and its application in the winding mechanical condition monitoring
Heat statistics in the relaxation process of the Edwards-Wilkinson elastic manifold
The stochastic thermodynamics of systems with a few degrees of freedom has
been studied extensively so far. We would like to extend the study to systems
with more degrees of freedom and even further-continuous fields with infinite
degrees of freedom. The simplest case for a continuous stochastic field is the
Edwards-Wilkinson elastic manifold. It is an exactly solvable model of which
the heat statistics in the relaxation process can be calculated analytically.
The cumulants require a cutoff spacing to avoid ultra-violet divergence. The
scaling behavior of the heat cumulants with time and the system size as well as
the large deviation rate function of the heat statistics in the large size
limit is obtained
Generation of bottle beam using low-density channel in air
Cylindrical density depressions generated by femtosecond laser pulses
filamenting in air for different energy depositions is investigated
numerically, by using a set of hydrodynamic equations. The evolution of density
profile is calculated for different temperature elevations, the results
indicate that the gas density hole is getting shallower and wider with the
increasing temperature elevations. A simulation of the propagation inside
low-density channel implies a new way to generate a type of bottle beam.Comment: 4 pages,5 figure
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