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Study on the Control and Topographical Recognition of an Underwater Rubble Leveling Robot for Port Construction

항만공사용 사석 고르기 수중로봇의 제어 및 지형인식에 관한 연구

  • Kim, Tae-Sung (Research institutes of Mechatronics Changwon National University) ;
  • Kim, Chi-Hyo (Research institutes of Mechatronics Changwon National University) ;
  • Lee, Jin-Hyung (Changwon National University) ;
  • Lee, Min-Ki (Department of Control and Instrumentation Eng. Changwon National University)
  • 김태성 (창원대학교 메카트로닉스 연구원) ;
  • 김치효 (창원대학교 메카트로닉스 연구원) ;
  • 이진형 (창원대학교) ;
  • 이민기 (창원대학교 제어계측공학과)
  • Received : 2018.04.09
  • Accepted : 2018.06.01
  • Published : 2018.06.30

Abstract

When underwater rubble leveling work is carried out by a robot, real-time information on the topography around the robot is required for remote control. If the topographical information with respect to the current position of the robot is displayed as a 3D graphic image, it allows the operator to plan the working schedules and to avoid accidents like rollovers. Up until now, the topographical recognition was conducted by multi-beam sonars, which were only used to assess the quality before and after the work and could not be used to provide real-time information for remote control. This research measures the force delivered to the bucket which presses the mound to determine whether contact is made or not, and the contact position is calculated by reading the cylinder length. A variable bang-bang control algorithm is applied to control the heavy robot arms for the positioning of the bucket. The proposed method allows operators to easily recognize the terrain and intuitively plan the working schedules by showing relatively 3-D gratifications with respect to the robot body. In addition, the operating patterns of a skilled operator are programmed for raking, pushing, moving, and measuring so that they are automatically applied to the underwater rubble leveling work of the robot.

수중에서 로봇으로 사석 고르기 작업을 실시할 경우 로봇 주위의 지형 정보를 실시간으로 제공해야 원격조종이 가능하다. 현 위치로부터 주변지형의 높낮이를 보여줘야 운전자가 작업 계획을 수립하고, 전복과 같은 사고도 예방할 수 있다. 지금까지 지형인식은 멀티 빔 소나에 의해 이뤄졌는데 이는 작업 전후의 품질을 평가하는 용도만 사용되었지 원격조종에서 필요한 실시간 정보로는 사용될 수 없었다. 본 연구는 수중 사석 고르기 작업을 위한 실시간 지형인식 방법을 개발한다. 버킷이 지면을 누를 때 전달되는 힘을 측정해 접촉여부를 판단하고, 실린더의 길이를 읽어 접촉위치를 계산한다. 버킷의 위치제어를 위해 가변 뱅뱅제어 알고리즘을 적용하고 숙련된 굴삭기 운전자의 작업패턴을 프로그램화해 지형인식, 긁기, 밀기, 전진 등의 작업을 자동으로 수행하도록 한다. 개발된 방법은 로봇 몸체로부터 버킷의 거리에 따라 3차원 격자 지형을 상대적으로 보여줌으로써 작업자가 쉽게 지형을 인식하고 지형에 따라 작업계획을 세우도록 한다.

Keywords

References

  1. Andrade-Cetto, J., Kocaoglan, E., Koivo, A. and Thoma, M(1996), "Modeling and control of excavator dynamics during digging operation," J Aerospace Eng, Vol. 9, No. 1, pp. 10-18. https://doi.org/10.1061/(ASCE)0893-1321(1996)9:1(10)
  2. Bradley, D. A. and Seward, D. W.(1998), "The Development, Control and Operation of an Autonomous Robotic Excavator," Journal of Intelligent and Robotic Systems, Vol. 21 pp. 73-97. https://doi.org/10.1023/A:1007932011161
  3. Durrant-Whyte, H., Ha, Q., Nguyen, Q. and Rye, D.(2000), "Force/position tracking for electrohydraulic systems of a robotic excavator", in Decision and Control, 2000. Proceedings of the 39th IEEE Conference on, pp. 5224-5229.
  4. Hirabayashi, T., Iwata, H., Yamamoto, T. and Yano, H.(2006), "Experiment on teleoperation of underwater backhoe with haptic information," International Association for Automation and Robotics in Construction, Proceedings 23rd Int. Sym. ISARC, pp. 36-41.
  5. Hong, D., Lee, S., Park, H. and Shin, J. O.(2007), "Optimal path planning for backhoe based on excavation environment", in Proceedings of the 24th International Symposium on Automation & Robotics in Construction, pp. 169-174.
  6. KIMST, (2014), Development of unmanned automated equipment for underwater construction of ports, Oceans and Fisheries R/D report.
  7. Katsura, S., Matsumoto, Y., and Ohnishi, K.(2007), "Modeling of force sensing and validation of disturbance observer for force control," Industrial Electronics, IEEE Transactions on, Vol. 54, No. 1, pp. 530-538. https://doi.org/10.1109/TIE.2006.885459
  8. Kim, C. H., Kim, T. S. and Lee, M. K.(2015), "Study on the design and the control of an underwater construction robot for port construction", Journal of Navigation and Port Research, Vol 39, No. 3, pp. 253-260. https://doi.org/10.5394/KINPR.2015.39.3.253
  9. Kim, C. H., Kim, T. S. and Lee, M. K.(2012), "Development of a pressure based observer to measure the length of an underwater robot for harbour construction", JMST, Vol. 36, No. 10, pp. 865-871.
  10. Iida, K., Naruse, T. and Sawano, T.(1988), "Rubble leveling robot in underwater construction", Tokyo. Japan. The 5th international symposium on robotics in construction, 5th ISARC pp. 727-735.
  11. Masory, O.(1986), "Improving contouring accuracy of nc/cnc systems with additional velocity feed forward loop", Journal of Engineering for Industry, Vol. 108, No. 3, pp. 227-230. https://doi.org/10.1115/1.3187068