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  • Non-linear method of analytical information vibration signal processing

    The article presents the non-linear method of analytical information vibration signal processing. This method allows to select spectral components of small amplitude stress concentrators on the backgroud noise. The method is based on digital filtering and demodulation of original vibration signal through its non-linear conversion. Application of smoothing the Hamming window allows to reduce the transition band nonrecursive digital filter and exclude from the sample of information parasitic components. The proposed non-linear analytical information vibration signal processing method lets to select spectral components of surface cracks and sinks most responsible elements of the rotor system and explore its dynamic sustainability.

    Keywords: non-linear transformation of analytical information vibration signal, discrete Fourier transform, Hamming window, stress concentrators, dynamic sustainability of rotor system

  • Current regulation active harmonic distortion filter

    The article provides one of the possible ways to increase the efficiency of a device for suppressing harmonic distortions of a current of a power line by introducing a difference signal into the feedback loop proportional to the deviation of the voltage of the power line from a reference value. A simulation model of a power system with a device for suppressing harmonic current distortions has been developed, which makes it possible to evaluate the effectiveness of the active filter for various parameters of the feedback loop. The oscillograms of currents in power lines are shown when a harmonic distortion device is connected. The results of the harmonic analysis of the voltage of the power line, showing a decrease in the level of voltage distortion when the active filter is connected to the power line, are presented.

    Keywords: current harmonic distortion, power line, simulation, active filter, Matlab / Simulink, nonlinear load, feedback, dynamic properties

  • Harmonic current suppression device

    The article describes a method for suppressing harmonic current distortion in a power line without direct measurement , to which a nonlinear load is connected, using a device, which not requiring a continuous current spectral analysis. The oscillograms of currents in the connection node of the device for suppressing higher harmonic currents, obtained as a result of simulation modeling of the operation of the power system with a nonlinear load and a Matlab / Simulink filter, are presented. A mathematical description of the proposed principle of suppressing the highest current harmonics is presented.

    Keywords: suppression device, harmonic distortion, simulation, power line, impedance, electromagnetic interferencer