Method of determining stationary signals for the diagnostics of an electromechanical system

A method of determining stationary signals for the diagnostics of an electromechanical system comprising the steps of:

• measuring an analog waveform signal (S) of the electromechanical system, converting measured waveform signal (S) to discrete processed signal (SDP) including vector of time instants and corresponding vector of amplitudes,
• splitting the discrete processed signal (SDP) into subdivided single periods (SDP1, SDP2, . . . , SDPn) where each of the subdivided single periods includes different or the same number of samples as other subdivided single periods,
• modifying number of samples for each subdivided single periods (SDP1, SDP2, . . . , SDPn) by resampling procedure getting subdivided single periods after resampling (SDR1, SDR2, . . . , SDRn), where all said subdivided single periods after resampling include the same number of samples,
• replacing the vector of time instants on a vector of consecutive integer numbers for each single period after resampling (SDR1, SDR2, . . . , SDRn), obtaining subdivided nondimensional single periods (SDN1, SDN2, . . . , SDNn),
• concatenating all subdivided nondimensional single periods (SDN1, SDN2, . . . , SDNn) into one nondimensional discrete signal (SN) by forming a sequence of consecutive samples setting up one after another taken from consecutive subdivided nondimensional single periods,
• replacing the vector of consecutive integer numbers on a vector of ascending time instants in the nondimensional discrete signal (SN), obtaining a dimensionalized stationary signal (SNt),
• transforming the dimensionalized stationary signal (SNt) from time domain to frequency domain, getting a frequencies spectrum, from which a vector of interest frequencies and corresponding vector of amplitudes are extracted to diagnose the electromechanical system and displayed on the visualization device.