scholarly journals Closed-Loop Behavior of an Autonomous Helicopter Equipped with a Robotic Arm for Aerial Manipulation Tasks

10.5772/53754 ◽  
2013 ◽  
Vol 10 (2) ◽  
pp. 145 ◽  
Author(s):  
Konstantin Kondak ◽  
Kai Krieger ◽  
Alin Albu-Schaeffer ◽  
Marc Schwarzbach ◽  
Maximilian Laiacker ◽  
...  
Keyword(s):  
Closed Loop ◽  
Robotic Arm ◽  
Aerial Manipulation ◽  
Autonomous Helicopter

Robust attitude fault-tolerant control for unmanned autonomous helicopter with flapping dynamics and actuator faults

2018 ◽  
Vol 41 (5) ◽  
pp. 1266-1277 ◽  
Author(s):  
Kun Yan ◽  
Mou Chen ◽  
Qiangxian Wu ◽  
Ke Lu
Keyword(s):  
Closed Loop ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Loop System ◽  
System Stability ◽  
Actuator Faults ◽  
Closed Loop System ◽  
Attitude Tracking ◽  
Control Scheme ◽  
Autonomous Helicopter

In this paper, an adaptive robust fault-tolerant control scheme is developed for attitude tracking control of a medium-scale unmanned autonomous helicopter with rotor flapping dynamics, external unknown disturbances and actuator faults. For the convenience of control design, the actuator dynamics with respect to the tail rotor are introduced. The adaptive fault observer and robust item are employed to observe the actuator faults and eliminate the effect of external disturbances, respectively. A backstepping-based robust fault-tolerant control scheme is designed with the aim of obtaining satisfactory tracking performance and closed-loop system stability is proved via Lyapunov analysis, which guarantees the convergence of all closed-loop system signals. Simulation results are given to show the effectiveness of the proposed control method.

scholarly journals Operational Space Control of a Lightweight Robotic Arm Actuated by Shape Memory Alloy (SMA) Wires

2016 ◽  
Author(s):  
Serket Quintanar-Guzmán ◽  
Somasundar Kannan ◽  
Miguel A. Olivares-Mendez ◽  
Holger Voos
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Closed Loop ◽  
Loop System ◽  
Robotic Arm ◽  
Control Law ◽  
Closed Loop System ◽  
End Effector ◽  
Position Regulation ◽  
The Stability

This paper presents the design and control of a two link lightweight robotic arm using a couple of antagonistic Shape Memory Alloy (SMA) wires as actuators. A nonlinear robust control law for accurate positioning of the end effector of the two-link SMA based robotic arm is developed to handle the hysteresis behavior present in the system. The model presented consists of two subsystems: firstly the SMA wires model and secondly the dynamics of the robotic arm itself. The control objective is to position the robotic arm’s end effector in a given operational plane position. For this regulation problem a sliding mode control law is applied to the hysteretic system. Finally a Lyapunov analysis is applied to the closed-loop system demonstrating the stability of the system under given conditions. The simulation results demonstrate the accurate and fast response of the control law for position regulation. In addition, the stability of the closed-loop system can be corroborated.

Development of a control architecture for a parallel three-axis robotic arm mechanism using CANopen communication protocol

2021 ◽  
pp. 1063293X2110019
Author(s):  
Fu-Shin Lee ◽  
Chen-I Lin ◽  
Zhi-Yu Chen ◽  
Ru-Xiao Yang
Keyword(s):  
High Speed ◽  
Closed Loop ◽  
Communication Protocol ◽  
Tracking Error ◽  
Robotic Arm ◽  
Control Architecture ◽  
Robot Kinematics ◽  
Closed Loop Control ◽  
Loop Control ◽  
Movable Platform

Based upon the CANopen communication protocol and the LabVIEW graphic programing procedures, this paper develops a closed-loop control architecture for a parallel three-axis (Delta) robotic arm mechanism. The accomplishments include prototyping a parallel three-axis robotic arm mechanism, assembling servomotors with associated encoders and gearsets, coding CANopen communication scripts for servomotor controllers and a host supervision GUI, coding forward/inverse kinematics scripts to compute the required servomotor rotations and the coordinates of a movable platform or the mechanism, coding tracking error compensation scripts for effective closed-loop griper control, and coding integration scripts to command and supervise the mechanism motion on the LabVIEW-based host GUI. During the development stage, this research designed and prototyped the parallel three-axis robotic arm mechanism based upon basic Delta robot kinematics. To control the mechanism effectively and accurately, this study implemented the CANopen communication protocol, which characterizes high speed and stable transmission. The protocol applies to the CANopen communication channels among the controllers and the host supervision GUI. On the LabVIEW development platform, the coded supervision GUI performs issuing/receiving messages to the CANopen-based controllers. The controllers excite the servomotors and actuate the parallel mechanism to track prescribed trajectories in a closed-loop control fashion. Meanwhile, an electromagnet attached to the movable platform of the robotic mechanism performs satisfactory picking/placing object actions.

scholarly journals EEG-Emulated Control Circuits for Brain-Machine Interface

2021 ◽  
Author(s):  
Liljana Bozinovska ◽  
Bozinovski Adrijan
Keyword(s):  
Mobile Robot ◽  
Human Body ◽  
Closed Loop ◽  
Brain Computer Interface ◽  
Robotic Arm ◽  
Brain Machine Interface ◽  
Flip Flop ◽  
Robotic Arms ◽  
Machine Interface ◽  
Control Circuits

This paper reviews efforts in a new direction of the EEG research, the direction of EEG emulated control circuits. Those devices are used in brain computer interface (BCI) research. BCI was introduced 1973 as a challenge of using EEG signals to control objects external to the human body. In 1988 an EEG-emulated switch was used in a brain machine interface (BMI) for control of a mobile robot. The same year a closed loop CNV paradigm was used in a BMI to control a buzzer. In 2005 a CNV flip-flop was introduced which opened the direction of EEG-emulated control circuits. The CNV flip-flop was used for BMI control of a robotic arm in 2009, and for control of two robotic arms in 2011. In 2015 an EEG demultiplexer was introduced. The EEG emulated demultiplexer demonstrated control of a robotic arm to avoid an obstacle. The concept of an EEG emulated modem was also introduced. This review is a contribution toward investigation in this new direction of EEG research.

Design and Control of an Omnibot Autonomous Vehicle

2008 ◽  
Author(s):  
Steven Bemis ◽  
Brian Riess ◽  
Scott Nokleby
Keyword(s):  
Collision Detection ◽  
Closed Loop ◽  
Detection System ◽  
Vision System ◽  
Autonomous Vehicle ◽  
Robotic Arm ◽  
Mobile Manipulator ◽  
Data Routing ◽  
System A ◽  
And Control

A design for autonomous control of a novel omni-directional platform is presented. This platform is to be used in conjunction with a robotic arm to further research of mobile-manipulator systems. This design differs from other omni-directional platforms that use omniwheels in that its drive axes do not intersect its geometric centre. The platform can be controlled autonomously through multiple sub-systems that have been designed including a closed-loop velocity controller, a localization system, an obstacle avoidance and collision detection system, a vision system, and a data routing system. These sub-systems communicate with a remote computer which plots the path and sends data to guide the platform. The closed-loop velocity controller provides feedback which can be used to analyze and correct the path of travel.

scholarly journals Control of a Lightweight Flexible Robotic Arm Using Sliding Modes

10.5772/5798 ◽  
2005 ◽  
Vol 2 (2) ◽  
pp. 11 ◽  
Author(s):  
Victor Etxebarria ◽  
Arantza Sanz ◽  
Ibone Lizarraga
Keyword(s):  
Robust Control ◽  
Optimal Design ◽  
Closed Loop ◽  
Sliding Mode ◽  
Robotic Manipulators ◽  
Robotic Arm ◽  
Sliding Modes ◽  
Flexible Link ◽  
Composite Approach ◽  
Control Scheme

This paper presents a robust control scheme for flexible link robotic manipulators, which is based on considering the flexible mechanical structure as a system with slow (rigid) and fast (flexible) modes that can be controlled separately. The rigid dynamics is controlled by means of a robust sliding-mode approach with well-established stability properties while an LQR optimal design is adopted for the flexible dynamics. Experimental results show that this composite approach achieves good closed loop tracking properties both for the rigid and the flexible dynamics.

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