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 (II): Back-Drivability

양로드형과 편로드형 EHA의 힘 제어 특성 비교(II): 역구동성

  • 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 : 2017.09.25
  • Published : 2017.12.01
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Abstract

In this study, the back-drivability of the single-rod and double-rod type EHAs (Electro-Hydrostatic Actuators) was compared by computer simulation and experiments. The back-drivability of EHAs exhibit non-linear behavior like their force tracking performance. In case of the double-rod type EHA, the back-drivability was mostly influenced by the bulk modulus of oil that changes with the working pressure due to entrapped air. The back-drivability of the single-rod type EHA was directly affected by the operation states of its pilot-operated check valves, while the asymmetrical piston geometry and the non-linear bulk modulus of oil also made the dynamic response in building up the cylinder pressure dependent on the operating conditions.

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References

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