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http://dx.doi.org/10.7839/ksfc.2017.14.4.009

Comparison of Force Control Characteristics Between Double-Rod and Single-Rod Type Electro-Hydrostatic Actuators (I): Tracking Performance  

Kim, Jong Hyeok (Aerospace & Mechanical Engineering, Graduate School, Korea Aerospace University)
Hong, Yeh Sun (Aerospace & Mechanical Engineering, Korea Aerospace University)
Publication Information
Journal of Drive and Control / v.14, no.4, 2017 , pp. 9-16 More about this Journal
Abstract
In this study, the force tracking performance of the single-rod and double-rod type EHAs (Electro-Hydrostatic Actuators) was compared by computer simulation and experiments. The force-controlled EHAs exhibit non-linear behavior that are significantly dependent on operation conditions. The investigation focused on localizing the parameters that provide significant rise to the non-linearity. For this, the single-rod and double-rod type EHAs were mathematically expressed to derive their linear models. In parallel, they were modeled by a commercial simulation program including non-linear properties based on experimental results. It was shown that the dependency of the bulk modulus of oil with entrapped air on working pressure dominated the non-linearity in force control performance in case of the double-rod type EHA. The force control of the single-rod type EHA was influenced by much more elements. Besides the asymmetrical piston geometry and the non-linear bulk modulus of oil, its pilot-operated check valves made it dependent not only on the magnitude of reference input but also on its direction.
Keywords
Electro-hydrostatic Actuator; Double-rod type EHA; Single-rod type EHA; Force Control; Dynamic response;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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