Modeling and Model Identification of Micro-position-control Hydraulic System

doi:10.3901/JME.2017.22.206

Abstract

Abstract: A micro-position-control hydraulic system (MHS) is proposed. This system utilized a servo motor and a hydraulic amplifying cylinder to replace hydraulic pump and servo valves. Mathematical model of MHS is derived and then influences on system open-loop behavior of oil modulus bulk, oil viscosity, accumulator pressure and volume are discussed. Relevant simulations are carried out under AMEsim environment, and the results show that large oil modulus bulk and small oil viscosity lead to fast open-loop response, while accumulator pressure and volume hardly influenced system open-loop behavior, which shows a good correlation with the mathematical model. A MHS test-rig is designed to verify the mathematical model. Open-loop frequency sweep experiment is carried out and test result is analyzed using Matlab system identification tool box. The identification results show that MHS performed a second order behavior with a resonance frequency of 46.5 Hz and a damping ratio of 0.303, which also reveals a good coincidence with the mathematical model. A PD controller based on identification results is adopted on a comprehensive test-rig with three MHSs, and the displacement bias ranges from -2 μm to 1.7 μm.

Key words: hydraulic system, Micro-position-control, model identification, modeling, position control

CLC Number:

TH137

PENG Xiongbin, GONG Guofang, LIAO Xiangping, WU Weiqiang, WANG Hui, LOU Haiyang. Modeling and Model Identification of Micro-position-control Hydraulic System[J]. Journal of Mechanical Engineering, 2017, 53(22): 206-211.

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