메뉴 건너뛰기
.. 내서재 .. 알림
소속 기관/학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
로그인 회원가입 고객센터 ENG
주제분류

추천
검색

논문 기본 정보

자료유형
학위논문
저자정보

진상록 (서울대학교, 서울대학교 대학원)

지도교수
김종원
발행연도
2014
저작권
서울대학교 논문은 저작권에 의해 보호받습니다.

이용수1

표지
AI에게 요청하기
추천
검색

이 논문의 연구 히스토리 (2)

초록· 키워드

오류제보하기
Most underwater work still depends on human divers despite the development of technique in fisheries and ocean industries. A robotic platform is considered to be a useful instrument to carry out underwater work in an efficient manner. In order to achieve various underwater tasks, a robotic platform must be able to maintain its position and orientation against ocean currents and reaction forces from the manipulator’s operation. We present a new remotely operated robotic platform with tilting thrusters for various manipulating operations in coastal waters. In the proposed design, four tilting thrusters are equipped on vertexes of a rectangular mainframe obliquely for the reduction of the number of actuators and the enlargement of space efficiency. The four thrusters can be tilted with respect to the mainframe to achieve six degree-of-freedom (DOF) motion. The tilting mechanism causes an increase in the nonlinearity of thrust force vector map. A dynamic model is derived for the underwater vehicle based on hydrodynamic analysis and nonlinear thrust vector mapping. In order to conquer the nonlinearity, the selective switching controller is designed and applied to the robot system. The selective switching PD controller chooses each three DOF linear sub-controller according to the error in real-time, and simulations show feasibility of the control system. The ability of robust hovering control is verified with the experiment in water tank. A standard RR manipulator is attached to the robotic platform and generates reaction forces and moments.

목차

Abstract
Contents
1 Introduction
1.1 Underwater robot research
1.1.1 Bio-inspired robot
1.1.2 Remotely operated vehicle
1.1.2.1 Over-actuated hovering techniques
1.1.2.2 Additional hovering techniques
1.2 Objective and Scope
2 Design and manufacturing of robotic platform
2.1 Overview of the underwater robotic platform
2.2 Mechanical design
2.2.1 Tilting thruster unit
2.2.2 Box structure design
2.2.3 Sealing design
2.3 Electronics and communication
2.3.1 Thruster
2.3.2 Motor driver
2.3.3 Sensors
3 Dynamic modeling
3.1 Equations of motion
3.2 Rigid body dynamic term
3.3 Hydrodynamic terms
3.3.1 Added mass and inertia
3.3.2 Drag force and moment
3.3.3 Restoring force and moment
3.4 Thrust vector map
3.5 Tilting thruster model
3.5.1 Experimental setup
3.5.2 Thrust force model for input voltage in the steady state
3.5.3 Thrust force model in transient state
3.5.4 Empirical tilting thruster model
3.5.5 Comparison between model and experimental results
4 Selective switching PD control design
4.1 Switching strategy
4.2 Control stability
4.2.1 Optimal gain for stability
4.2.2 Transient switching time
5 Simulation
5.1 Disturbance design
5.1.1 Tilting motion
5.1.2 Reaction force and moment
5.1.2.1 Kinematics of a manipulator
5.1.2.2 Quasi-Lagrange formulation
5.1.2.3 Dynamics of a manipulator
5.2 Simulation results
5.2.1 Movement with no disturbance
5.2.2 Hovering under the disturbance
6 Experiment
6.1 Experimental setup
6.1.1 Short base line (SBL) system
6.1.2 Standard reproduction manipulator
6.2 Experimental results
6.2.1 Subsystems control
6.2.1.1 X, Y, Yaw control
6.2.1.2 Z, Roll, Pitch control
6.2.2 Hovering motion under no load
6.2.3 Hovering motion with standard reproduction manipulator
7 Conclusion
Bibliography
Abstract in Korean
Appendix

최근 본 자료

전체보기

댓글(0)

0