• Title/Summary/Keyword: second order sliding mode

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Incremental Twisting Compensator for Performance Improvement of Helicopter Control (헬리콥터 제어 성능 개선을 위한 증분 트위스팅 보상기)

  • Seo, Gang-Ho;Ju, Jongin;Kim, Yoonsoo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.49 no.3
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    • pp.213-219
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    • 2021
  • In this paper, an incremental twisting compensator is proposed for improving the performance of helicopter control and tested on an in-house full-scale helicopter simulator. The proposed compensator has a merit in that an incremental control input (a second-order sliding mode control input or so-called twisting control input) is simply added to improve the performance of helicopter control, while the original flight control structure remains untouched. The proposed control technique has been shown to improve the transient and steady-state response of the in-house helicopter simulator.

Detection and Identification of CMG Faults based on the Gyro Sensor Data (자이로 센서 정보 기반 CMG 고장 진단 및 식별)

  • Lee, Jung-Hyung;Lee, Hun-Jo;Lee, Jun-Yong;Oh, Hwa-Suk;Song, Tae-Seong;Kang, Jeong-min;Song, Deok-ki;Seo, Joong-bo
    • Journal of Aerospace System Engineering
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    • v.13 no.2
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    • pp.26-33
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    • 2019
  • Control moment gyro (CMG) employed as satellite actuators, generates a large torque through the steering of its gimbals. Although each gimbal holds a high-speed rotating wheel, the wheel imbalances induces disturbance and degrades the satellite control quality. Therefore, the disturbances ought to be detected and identified as a precaution against actuator faults. Among the method used in detecting disturbances is the state observers. In this paper, we apply a continuous second order sliding mode observer to detect single disturbances/faults in CMGs. Verification of the algorithm is also done on the hardware satellite simulator where four CMGs are installed.