FREQUENCY RESPONSE ANALYSIS SYSTEM SUPPRESSING FREQUENCY DEAD BAND

摘要

PROBLEM TO BE SOLVED: To provide an FRA (frequency response analysis) system which identifies frequency characteristics of a plant.;SOLUTION: An FRA system (2) which identifies frequency characteristics of a plant (3) calculates, for an input (U) of a power dimension of the plant (3), a difference value U' through a first difference unit (14) and then calculates a frequency response U'(ω) through a first DFT operation unit (16), and calculates, for an output (Y) of a position dimension of the plant (3), a difference value Y' through a second difference unit (15) and then calculates a frequency response Y'(ω) through a second DFT operation unit (17). The FRA system (2) is characterized in that a multiplier divider (18) calculates frequency characteristics of the plant (3) from the frequency response U'(ω) and the frequency response Y'(ω).;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT