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Published in: Intelligent Service Robotics 1/2015

01-01-2015 | Original Research Paper

Design of a momentum-based disturbance observer for rigid and flexible joint robots

Authors: Min Jun Kim, Young Jin Park, Wan Kyun Chung

Published in: Intelligent Service Robotics | Issue 1/2015

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Abstract

Disturbance observer (DOB) is widely used in many practical applications due to its simple structure and high performance. However, the DOB cannot be directly applied to the robotic systems because of the nonlinearities/couplings in the inertia matrix (by means of coupling, we mean off-diagonal terms of the inertia matrix). This paper proposes a momentum-based DOB for general rigid joint robotic systems. By introducing the generalized momentum, it is possible to utilize full nonlinearities and couplings of the inertia matrix in the DOB design. Moreover, the momentum-based DOB design for the rigid joint robots can be easily extended to the flexible joint robot applications by applying it to the link-side dynamics and motor-side dynamics, respectively. As a result, we can estimate the external torque acting on the link-side and can compensate the disturbance occurring in the motor-side at the same time. Uniformly ultimated boundedness of the closed-loop dynamics can be shown through the Lyapunov-like approaches. The proposed scheme is verified using the numerical simulations.

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Footnotes
1
\(Q(s)\) should be designed to make \(Q(s)G_{n}(s)^{-1}\) proper. In the implementation, one has to implement \(Q(s)\) and \(Q(s)G_{n}(s)^{-1}\).
 
2
Here, although \(L\) is a matrix, it is treated like a scalar value for simplicity of writing. However, no confusion occurs because \(L\) is a diagonal matrix.
 
3
It should be noted that the definition of \(A_{ss}\), \(B_{ss}\), and the state \(x\) may differ depending on the controller. For example, if a PID tracking control is of interest, \(x\) will be defined by \(x=[\int e \;\; e \;\; \dot{e}]\), where \(e \triangleq q_{d} - q\) with properly redefined \(A_{ss}\) and \(B_{ss}\). Nevertheless, the proposed momentum-based DOB can be applied seamlessly.
 
4
As a matter of fact, in this case, we can assume \(\dot{\tau }_{d}=0\). In this case, we can always prove the asymptotic stability (\(x\) and \(\tau _{d}-\widehat{\tau }_{d}\) converge to zero).
 
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Metadata
Title
Design of a momentum-based disturbance observer for rigid and flexible joint robots
Authors
Min Jun Kim
Young Jin Park
Wan Kyun Chung
Publication date
01-01-2015
Publisher
Springer Berlin Heidelberg
Published in
Intelligent Service Robotics / Issue 1/2015
Print ISSN: 1861-2776
Electronic ISSN: 1861-2784
DOI
https://doi.org/10.1007/s11370-014-0163-9

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