Is your tested frequency response "Linear"?


The Frequency Response Function (FRF) has always been an important basis for analyzing system characteristics in the field of automatic control. All relevant theoretical analysis is based on the assumption that the operating range of the system is "linear".

However, when the output load of the system increases and it is forced to work in the "non-linear" range, what changes will occur in the frequency response of the system obtained from the test? The measured responses can also provide what kind of reference information for engineers?

This article is aimed at this point, puts forward the principle and method of analysis, and compares and verifies the experiment on the motor and hydraulic system, and proposes the concept of performance envelope (Performance Envelop), which will be of great help for the system in the design, performance estimation, and component selection.

#FrequencyResponse #LinearNonlinear #Saturation #PerformanceEnvelop #FRFShearingEffect

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