Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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Comparison of Force Control Characteristics Between Double-Rod and Single-Rod Type Electro-Hydrostatic Actuators (I): Tracking Performance

양로드형과 편로드형 EHA의 힘 제어 특성 비교(I): 추종 성능

  • Kim, Jong Hyeok (Aerospace & Mechanical Engineering, Graduate School, Korea Aerospace University) ;
  • Hong, Yeh Sun (Aerospace & Mechanical Engineering, Korea Aerospace University)
  • Received : 2017.08.21
  • Accepted : 2017.11.16
  • Published : 2017.12.01
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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.

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References

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