Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
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A Study on the Main Failure Mode Analysis and Lifetime Improvement of Hydraulic Servo Actuators

유압서보 액추에이터의 주 고장모드 분석 및 수명개선에 관한 연구

  • Lee, Yong-Bum (Department of Reliability Assessment, Korea Institute of Machinery & Materials) ;
  • Jung, Dong-Soo (Department of Reliability Assessment, Korea Institute of Machinery & Materials) ;
  • Lee, Gi-Chun (Department of Reliability Assessment, Korea Institute of Machinery & Materials) ;
  • Kang, Bo-Sik (Department of Reliability Assessment, Korea Institute of Machinery & Materials) ;
  • Lee, Jong-Jik (Department of Reliability Assessment, Korea Institute of Machinery & Materials)
  • Received : 2018.08.28
  • Accepted : 2018.10.30
  • Published : 2018.12.01
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Abstract

The hydraulic servo actuator has always operated very precisely with high frequency and small displacement, and is used continuously for a long time. The hydraulic servo actuator of the test equipment used in the accelerated life test in order to guarantee the service life of the automotive parts failed earlier than the products before finishing the test. This study performed an analysis on the cause of the failure of the hydraulic servo actuator used in the test equipment, changed the design of the actuator to solve the root cause of the main failure mode, and developed the improved servo actuator. Based on above process, this study established a better performances and longer lifetime of the servo actuator after testing.

Keywords

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Fig. 1 Tensile compression fatigue test equipment

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Fig. 2 Fault picture of hydraulic servo actuator

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Fig. 3 Comparison of elastic seal type and labyrinth seal type

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Fig. 4 Flow Characteristics of Hydrostatic Bearing

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Fig. 5 A ring gap for modeling the piston labyrinth seal

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Fig. 6 Dimensional arrangement of the five square grooves

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Fig. 7 Modeling of Labyrinth Seal for piston

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Fig. 8 Result of Labyrinth Seal Simulation

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Fig. 9 Pressure drop of the fluid flow through 21 radial grooves

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Fig. 10 Hydraulic servo actuator prototype mounting test photograph

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Fig. 11 Real-Time System Block Diagram

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Fig. 12 Block Diagram of Actuator Control System

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Fig. 13 Results of Hydraulic Servo Actuator According to Frequency Change power control device

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Fig. 14 Displacement Test Results of Hydraulic Servo Actuator According to Frequency Change power control device

References

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