Parallel Robots

Stewart Gough Platform

• Research Backgrounds

  • The platform is needed for the motion of 6 DOF in 3 dimensional space.

  • The motion base is needed for the synchronized motion of 6 DOF in virtual reality.

• Research Output

              <Photo of Stewart platform developed at Korea Univ>

• Research Objectives

  • Development of the Stewart platform as a motion base of the motion simulator which can accommodate one person.

  • Larger angles of pitch and roll than existing platforms.

  • High response time for use in gameplay.

• Structure of the Developed Stewart Platform

  • • Linear motion of the platform's legs combining 400W servomotors with ballscrews.

    • Adopting a DSP controller

  • Resizable platform: The distance between the center of platform and the joints of platform's legs can be resizeable in real time.

  • The workspace of the platform expands with the increasing of the roll and pitch angles as the distance decreases.

• • Motion of Stewart platform with resizable platform SPRP

•  Specification of the Developed Stewart Platform

  • • Payload: 200kg (400kg max)

• • Bandwidth: 10Hz

  • Width x Depth x Height(initial): 0.73m x 0.84m x 0.60m

  • Roll /angular velocity/acceleration: ±25deg, ±53deg/s, ±350deg/s^2

  • Pitch/angular velocity/acceleration: ±25deg, ±45deg/s, ±400deg/s^2

  • Yaw /angular velocity/acceleration: ±30deg, ±60 deg/s, ±300deg/s^2

  • Surge displacement/velocity/acceleration: ±0.20m, ±47m/s, ±0.85g

  • Sway displacement/velocity/acceleration: ±0.20m, ±41m/s, ±0.75g

  • Heave displacement/velocity/acceleration: ±0.15m, ±31m/s, ±0.94g                                                                    

• Demo of the Stewart platform developed at Korea Univ

• Related Papers/Patents

  • • Paper 1. Se-Han Lee, Jae-Bok Song, Position Control of a Stewart Platform Using Inverse Dynamics Control with Approximate Dynamics , Mechatronics, Vol. 13 , No. 6, pp. 605-619, 2003.07.

    • Paper 2. Se-Han Lee, Jae-Bok Song, Acceleration Estimator for Low Velocity and Low Acceleration Regions Based on Encoder Position Data, IEEE/ASME Trans. on Mechatronics, Vol. 6, No. 1, pp. 58 -64, 2001.03.

    • Paper 3. 이세한, 송재복, 근사 역동역학을 이용한 스튜어트 플랫폼의 위치제어, 제어자동화시스템공학 논문지, Vol. 7, No. 12, pp. 993-1000, 2001.12.

    • Paper 4. 이세한, 송재복, 중력을 이용한 병렬형 머니퓰레이터 구동부의 마찰력 보상, 제어자동화시스템공학회 논문지, Vol. 11, No. 7, pp. 609-614, 2005.07.

    • Paper 5. Se-Han Lee, Jae-Bok Song, Workspace and Force-Moment Transmission of a Variable Arm Type Parallel Manipulator, Proc. of IEEE Int'l Conf. on Robotics and Automation, pp. 3666-3671, 2002.11.

    • Paper 6. Se-Han Lee, Jae-Bok Song, Controller Design for a Stewart Platform Using Small Workspace Characteristics, Proc. of Int'l Conf. on Intelligent Robots and Systems, pp. 2184-2189, 2001.

Motion Simulator

• Researchers

  • • Jong-Kuk Kim(Master), Ui-Jung Jung(Master), Hyung-Geon Park(Master)

• Research period

  • • 2001.03 ~ 2004.2

• Research outcomes

                       <Photo of motion simulator KU-MS developed at Korea Univ.>

• • Papers

    • 관련논문 1: Jae-Bok Song, Ui-Jung Jung, Hee-Dong Ko, Washout Algorithm with Fuzzy-Based Tuning for a Motion Simulator, KSME International, Vol. 17, No. 2, pp. 217-225, 2003.02

    • 관련논문 2: 박형근, 김종국, 정의정, 송재복, 고희동, 디바이스 서버를 이용한 모션 베이스 특성에 따른 시각적 동기화, 한국감성과학회 추계학술대회 논문집, pp. 47-52, 2002.11.

  • Research background

    • Need of the motion simulator which provides synchronized vision and motion information in virtual surroundings

    • Need of the motion simulator which provides an interactive gaming conditon

    • Need of the motion simulator which provides virtual surroundings for driving

  • Research Objective

    • Development of the motion simulator to provide virtual reality condition for single person

    • Overcome the limit of the motion base of simulator by using washout filter

    • Development of  the technology for providing synchronized vision and motion information in virtual surroundings

    • Development of the virtual model for driving simulation

  • Driving simulation

  • Roller Coaster