نتایج جستجو برای: fault characteristic frequencyl
تعداد نتایج: 237969 فیلتر نتایج به سال:
The fault current levels through the electric devices have a significant impact on failure probability. New fault current results in exceeding the rated capacity of circuit breaker and switching equipments and changes operation characteristic of overcurrent relay. In order to solve these problems, SFCL (Superconducting Fault Current Limiter) has rising as one of new alternatives so as to improv...
This paper presents a signal analysis technique for internal combustion (IC) engine fault diagnosis based on the spectrogram and artificial neural network (ANN). Condition monitoring and fault diagnosis of IC engine through acoustic signal analysis is an established technique for detecting early stages of component degradation. The location dependent characteristic fault frequencies make it pos...
In this paper, we propose a three-stage lightweight framework for centrifugal pump fault diagnosis. First, the vibration signatures are fast transformed using Walsh transform, and spectra obtained. To overcome hefty noise produced by macro-structural vibration, proposed method selects characteristic coefficients of spectrum. second stage, statistical features in time spectrum domain extracted f...
0167-8191/$ see front matter 2013 The Authors. Published by Elsevier B.V. All rights reserved. http://dx.doi.org/10.1016/j.parco.2013.09.001 q This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, dist and reproduction in any medium, provided the original author and source are credited. ⇑ Corresponding author. Tel...
Results for the diagnosability of hybrid dynamical networks are presented. These results give the conditions for which arbitrary events (including faults) in hybrid networks can be detected and isolated using a general class of indicator functions. These results emerge from the overlap of the control theoretic fault detection and isolation (FDI) and diagnosis (DX) communities. The interaction o...
The arc-suppression coil (ASC) in parallel low resistance (LR) multi-mode grounding is adopted the mountain wind farm to cope with phenomenon that misoperation or refusal of zero-sequence protection LR farm. If fault disappears before put into system, it judged as an instantaneous fault; while does not disappear after a permanent single-phase (SLG) criterion based on power variation proposed id...
Results for the diagnosability of hybrid dynamical networks are presented. These results give the conditions for which arbitrary events (including faults) in hybrid networks can be detected and isolated using a general class of indicator functions. These results emerge from the overlap of the control theoretic fault detection and isolation and diagnosis communities. The interaction of the many ...
Insight into the mechanics of brittle strain localization and fault propagation is gained by investigating the growth of deformation bands and fault–related deformation band damage zones. In porous granular rocks such as sandstone or tuff, the onset of brittle strain localization is characterized by pore space collapse along nucleating deformation bands, then by shear displacements along propag...
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