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Connectivity of cartesian product digraphs and fault-tolerant routings of generalized hypercube
      
In this paper,the problem of fault-tolerant routings in fault-tolerant networks is considered.
      
When either a node or a link in a fault-tolerant network fails, the communication from one node to another using this faulty element must be sent via one or more intermediate nodes along a sequence of paths determined by this routing.
      
An important and practical problem is how to choose a routing in the network such that inter-mediate nodes to ensure communication are small for any fault-set.
      
The R2-edge-connectivity of G, denoted by λn(G), is the minimum cardinality over all R2-edge-cuts, which is an important measure for fault-tolerance of computer interconnection networks.
      
The super edge-connectivity of a graph is an important parameter to measure fault-tolerance of interconnection networks.
      
New Algorithm for Fault Superimposed Quantities Based on Superimposed Network
      
A new algorithm for fault superimposed quantity (FSIQ) is presented and analyzed.
      
The network equations are built up by combining fault superimposed networks (FSIN) with the boundary conditions of FSIQ at the fault point and are solved with the Newton iterative method.
      
Rotor broken-bar fault diagnosis of induction motor based on HHT of the startup electromagnetic torque
      
This paper presents a new method for rotor broken-bar fault diagnosis of induction motors.
      
The asymmetry of the rotor caused by broken-bar fault will give rise to the appearance of additional frequency component of 2sfs (s is slip and fs is supply frequency) in the electromagnetic torque spectrum.
      
Then, using the instantaneous frequency extraction principle of the Hilbert Transform, the rotor broken-bar fault characteristic frequency of 2sfs can be exactly extracted from the IMF component, which includes the rotor fault information.
      
Moreover, the magnitude of the IMF which includes the rotor fault information can also give the number of rotor broken bars.
      
Experimental results demonstrate that the proposed electromagnetic torque-based fault diagnosis method is feasible.
      
Induction motor rotor fault diagnosis method based on double PQ transformation
      
This paper presents a new rotor fault diagnosis method for induction motors which is based on the double PQ transformation.
      
Thus, by distinguishing these two different patterns, the rotor broken bar fault is detected.
      
We use the major radius of the ellipse as the fault indicator and the distance between the point of no-load condition and the center of the ellipse on the PQ plane as its normalization value.
      
We thus arrive at the fault severity factor which is fairly independent of the load level and the inertia value of the induction motors.
      
 

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