End-point sensing and load-adaptive control of a flexible robot arm

1985 ◽  
Author(s):  
Winston Nelson ◽  
Debasis Mitra ◽  
Robert Boie
Keyword(s):  
Adaptive Control ◽  
Robot Arm ◽  
Flexible Robot ◽  
End Point

End-point tracking for a flexible robot arm

1994 ◽  
Vol 27 (14) ◽  
pp. 687-692
Author(s):  
L. Benvenuti ◽  
M.D. Di Benedetto
Keyword(s):  
Robot Arm ◽  
Flexible Robot ◽  
End Point ◽  
Point Tracking

scholarly journals Position and Force Neuro-Adaptive Control of a Flexible Robot Arm.

1993 ◽  
Vol 59 (562) ◽  
pp. 1765-1770
Author(s):  
Hiroyuki Kojima ◽  
Min Zhang ◽  
Tsutomu Matsuura ◽  
Iwanori Murakami ◽  
Toshiaki Ueki
Keyword(s):  
Adaptive Control ◽  
Robot Arm ◽  
Flexible Robot

A13 Basic Research of End Point Position Control for Two Links Flexible Robot Arm

2009 ◽  
Vol 2009.11 (0) ◽  
pp. 167-170
Author(s):  
Kiyoharu NAKAGAWA ◽  
Ryouta AIKAWA ◽  
Toru WATANABE ◽  
Kazuto SETO
Keyword(s):  
Position Control ◽  
Basic Research ◽  
Robot Arm ◽  
Flexible Robot ◽  
Point Position ◽  
End Point

Mechatronic robot arm with active vibration absorbers

2020 ◽  
Vol 26 (13-14) ◽  
pp. 1145-1156 ◽  
Author(s):  
Karel Kraus ◽  
Zbyněk Šika ◽  
Petr Beneš ◽  
Jan Krivošej ◽  
Tomáš Vyhlídal
Keyword(s):  
Vibration Suppression ◽  
High Accuracy ◽  
Robot Arm ◽  
Frequency Range ◽  
Flexible Robot ◽  
Linear Quadratic ◽  
Mass System ◽  
End Effector ◽  
End Point ◽  
Serial Robots

Serial robots are typically able to cover large workspace, but their mass/stiffness ratio does not allow combining high accuracy and high dynamic of the end effector operations. Widely spread usage of serial robots, even for tasks such as drilling, leads to high accuracy demands through its workspace. Absolute measurement of the end point for position feedback can be challenging due to objects or even a workpiece in the workspace. Moreover, inbuilt motors of the serial robot cannot response in the frequency range high enough as vibration of the end point. Instead, an additional spring–mass system is attached to the robot to suppress vibrations. The narrow frequency range of a passive dynamic absorber can be extended with active elements between the robot and absorber. An active approach is also necessary because of robots eigenfrequencies and eigenmodes variability. The study deals with a planar flexible robot equipped with a three-degree-of-freedom planar active absorber. The absorber is tuned passively to one value of multiple eigenfrequency. The linear-quadratic regulator control with a state observer has been designed as an active absorber control algorithm. Feedback inputs are absorber body acceleration, end effector acceleration, and relative motions in three absorber actuators realized by voice coils. The end effector vibration suppression along the robot trajectory is achieved using gain scheduling of local controller’s outputs.

Inverse Dynamics of a Flexible Robot Arm by Optimal Control

1993 ◽  
Vol 115 (2) ◽  
pp. 289-293 ◽  
Author(s):  
T. Kokkinis ◽  
M. Sahraian
Keyword(s):  
Optimal Control ◽  
Inverse Dynamics ◽  
Robot Arm ◽  
Flexible Robot ◽  
Joint Torques ◽  
Practical Applications ◽  
End Point ◽  
Point Tracking ◽  
Flexible Arms ◽  
High Frequency Content

The problem of end-point positioning of flexible arms is discussed. Because of the nonminimum phase nature of the problem, inversion fails to produce bounded joint torques. Bounded noncausal joint torques for achieving the task of end-point tracking for a multilink arm are found using optimal control theory. The torques obtained have no high-frequency content, and are suitable for practical applications. The method is illustrated by simulation of a single-link arm, for which stability and robustness considerations for design are given.

Adaptive Output Regulation of a Flexible Arm

1996 ◽  
Vol 118 (1) ◽  
pp. 167-172 ◽  
Author(s):  
P. Lucibello ◽  
F. Bellezza
Keyword(s):  
Adaptive Controller ◽  
Least Square ◽  
Linear Feedback ◽  
Robot Arm ◽  
Flexible Robot ◽  
End Point ◽  
Flexible Arm ◽  
Controller Performance ◽  
Payload Mass ◽  
Total Stability

A self-tuned version of a controller for asymptotic trajectory tracking of the end point of a two-link flexible robot arm is presented. The bounded solution to the inverse system, which is used in the control law, is tuned by the estimates of the unknown robot parameters, generated by a least square identification scheme. Soundness of the state of the adaptive controller is achieved by a stabilizing linear feedback from the output error, with fixed gains and robust with respect to variations of the parameters. This guarantees the total stability of the system, which is the main ingredient used in the proof of the controller properties, through a Lyapunov-like approach. The controller performance is finally illustrated by numerically simulating the tracking of an end point ramp under payload mass variations.

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