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Application of the Harmonic Analysis to Estimate the Gain of the Mathematical Model of the Aircraft Structure Strength Test Bench

The problem of estimating the amplification factor of the channel of force loading of the bench for strength tests of aircraft structures is considered. The solution of this problem may allow in the future automating the process of setting up regulators for electric hydraulic valves of the stand and thereby accelerate the process of carrying out fatigue and strength tests. In this paper, it is proposed to use the harmonic analysis of the signal from the load force sensor and the control signal at the input of the electrohydraulic distributor to estimate the gain of the force loading channel. In this paper, it has been shown that on the basis of this analysis an estimate of the gain of the power loading channel of the bench can be obtained. The results of application of the proposed approach on an experimental stand are presented. Finally, the proposed approach was compared with another approach based on the least squares method with sliding window.