Load effect studies on ARX model parameters of vertical position Electro-Hydraulic Actuator

Abstract

EHA system is commonly found in industrial processes such as aircraft manufacturing, food production and automotive assembly due to accurate positioning toward the load and fast response. There are some behavior limitations in modeling this system due to uncertainties, highly nonlinearities, and leakage effect. This paper studies the effect of loads on ARX model parameters of vertical position EHA system. Open-loop experimental tests on EHA system without load and with load were conducted. Load experimental weights of 1kg, 2.25kg and 3.5kg and sampling-time of 30ms were used. ARX model structure was used and derived from Matlab System Identification Toolbox. Results showed that no significant effect to ARX331 model parameters due to varying load applied.