Estimation of the Mathematical Model Parameters for a Multi-Channel Electro-Hydraulic Strength Test Bench

A feature of strength test benches is the presence of many channels of force loading interconnected through the mechanical structure, which complicates the setting of the bench control system regulators. Synthesis of an efficient test bench control system and autotuning of the controller parameters require a preliminary analysis of the mathematical model of the strength test bench. In this paper, the problem of estimating the parameters of a mathematical model of a multichannel electrohydraulic bench for strength testing of aircraft structures is considered. Identification of the mathematical model parameters of the bench is carried out by conducting a special experiment. This experiment is based on the applying a trial harmonic signal sequentially to each control channel and signals processing at the input and output of the bench. The results of such an experiment make it possible to evaluate the mutual influence matrix of control channels. The paper presents the results of the experiments and estimation of the parameters of a multichannel test bench.