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This paper presents the construction scheme of brake shoe clearance security real-time monitoring system, the system take mine hoist brake shoe clearance for the monitoring object, with the support of microcontroller AT89C52 and VB6.0, combining the techniques of SQL Server, Man-machine interface design and other technical, it fulfills the signal acquisition and processing and transmission from the...
A comparison is drawn between two digital phase delay estimators with negative frequency contribution which are suitable for real signals when the frequency is quite low or close to the Nyquist frequency. The first estimator is based on discrete Fourier transform and the second estimator is based on discrete-time Fourier transform. Using the error theory, the formulas for evaluating the mean square...
A novel signal processing method for Coriolis mass flowmeter (CMF) is proposed based on time-varying signal model. First, an adaptive lattice notch filter with the capability of tracking frequency variation is applied to filter the signal and calculate the frequency. Then the recursive DTFT algorithm with negative frequency contribution, which can largely shorten the convergence stage, is introduced...
There is a long convergence stage when using the sliding Goertzel algorithm to measure the phase difference between signals of a Coriolis mass flowmeter (CMF) because the contribution of negative frequency is neglected in the algorithm. A novel method for CMF signal processing is proposed based on the recursive discrete-time Fourier transform (DTFT) algorithm with negative frequency contribution....
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