W. Gawędzki

Zastosowanie transformacji Hilbert Vibration Decomposition do analizy sygnałów parasejsmicznych w dziedzinie czasu

The article reports on investigation results of Hilbert Vibration Decomposition transformation (HVD) utilization for a paraseismic signals. The main HVD parameters are considered in the explored area. We performed signals decomposition for a sum of a quasi harmonic components that amplitudes and frequencies are parametric time functions. In contrast to commonly used in diagnostic’s DFT and STFT transformations, proposed method is suitable for non-stationary and nonlinear phenomenon’s. (The application of HVD transformation for paraseismic signals analysis in the time domain). Słowa kluczowe: dekompozycja sygnałów, sygnały parasejsmiczne, transformacja Hilberta, transformacja HVD.

Comparison of Self-Calibration Methods for Measurement Channels in Respect of a Method of Conversion Functions Interpolation

Comparison of Self-Calibration Methods for Measurement Channels in Respect of a Method of Conversion Functions Interpolation The paper suggests algorithms enabling self-calibration of measurement channels with linear as well as nonlinear conversion functions. To approximate conversion characteristics, interpolation methods are used. They are widely known; however, the essence of the suggested self-calibration method is the current modernization of interpolating functions parameters due to a suitable procedure. It enables correction of the two essential error components which may appear in the measurement channel by means of evaluating the current value of the real slope of the conversion characteristic as well as of the components describing nonlinearity generated by disturbing factors. The methods of self-calibration for measurement channels cooperating with non-electrical quantities sensors are compared. Interpolation of conversion functions is assumed as linear in intervals and polynomial.