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The principle and algorithm of Empirical mode decomposition (EMD) and ensemble empirical mode decomposition (EEMD) is introduced, and two methods are respectively used to analyze simulated signal and engine's vibration signals. Based on EEMD, the signal can be efficiently decomposed into a finite number of intrinsic mode functions (IMFs) by adding white noise, and the problem of mode mixing in frequency...
To diagnose faults in engine accurately, technology on unsteady vibration signal acquisition(UVSA) from engine is studied. Measure principal, software and hardware composition of UVSA system at fixed rotary-speed is discussed and method of frequency bond energy accumulation(FBEA) is introduced. Based on short term Fourier transform (STFT), the repeatability and stability of acquired unsteady signal...
In order to monitor technical information in vehicle, monitoring system is designed based on CAN Bus. The hardware of data acquisition ECU is designed. By scheduling priority and send cycle, every node is optimized by considering bus average load rate and maximum delay time limit. Experimental results show that maximum delay time of node with lowest priority is reduced by 30% after modify, and CAN...
In video surveillance system, in order to classify vehicles, every region of moving target can be labeled by single linking region growing algorithm, so the area and degree of shape complex can be gotten for every target, and can be used as input eigenvalues, then fuzzy clustering algorithm is adopted to classify moving targets. In this course, euclid distance with weights is used as criterion, and...
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