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The latest progress and the research direction on reducing computation error of periodic signal measurement are simply introduced firstly. The reason of computation error is analyzed in detail. Modified trapezoidal integral method is proposed to measure active power, which based on asynchronous sampled data. The method can reach an inerrable result. By computer simulation based on the new method,...
A vibration signal analysis system introduced by this paper adopts hybrid programming of Matlab and Delphi, using data file for agency to achieve data communication. The procedure of signal analysis system is written and turned into the independent executable file under the environment of Matlab, which is called under the environment of Delphi. The system combined programming languages of matlab and...
On-line diagnostics of induction motor faults such as broken rotor bars can be accomplished by analyzing the anomalies of motor stator current. This paper presents a novel approach for the detection of the broken rotor bars in induction motors based on wavelet ridge. The characteristic frequency component (CFC) of the broken rotor bars is very close to power frequency in frequency domain but far less...
This paper presents an engineering project evaluation and decision-making method based on the DEA algorithm, and according to the DMU characteristics of multiple-input multiple-output then establishes an evaluation model and evaluation indicator system and does analysis combines cases. The scheduling problem about the effective DMUS of DEA is discussed.
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