METHOD FOR QUALIFYING THE STABILITY OF A CONTROLLED SYSTEM

摘要

The invention relates to a method for qualifying a controlled system (1) generating at the output a time signal (3) adjusted on the basis of a setpoint time signal (2) fed at the input, wherein said method comprises: selecting an evaluation time slot; centring the adjusted time signal (3) and the setpoint time signal (2); calculating the loop deviation signal (4), deviation signal, setpoint signal, adjusted signal, in the evaluation time slot; calculating the power spectral density signal (5), PSD, of said loop deviation signal (4); modelling the power spectral density signal (5), PSD, by a polynomial function PSD Mod based on the frequency; calculating the area (7) for which the power spectral density signal (5), PSD, is higher than the modelled signal (8) PSD_mod; determining a stability criterion between 0 and 100 equal to one hundred times said area (7) weighed by the signal PSD (5), wherein the lower said stability criterion is, the more stable the controlled system (1) is.