Stiffness Control of Surgical Continuum Manipulators
Identifieur interne : 002941 ( Main/Curation ); précédent : 002940; suivant : 002942Stiffness Control of Surgical Continuum Manipulators
Auteurs : Mohsen Mahvash ; Pierre E. DupontSource :
- IEEE transactions on robotics : a publication of the IEEE Robotics and Automation Society [ 1552-3098 ] ; 2011.
Abstract
This paper introduces the first stiffness controller for continuum robots. The control law is based on an accurate approximation of a continuum robot’s coupled kinematic and static force model. To implement a desired tip stiffness, the controller drives the actuators to positions corresponding to a deflected robot configuration that produces the required tip force for the measured tip position. This approach provides several important advantages. First, it enables the use of robot deflection sensing as a means to both sense and control tip forces. Second, it enables stiffness control to be implemented by modification of existing continuum robot position controllers. The proposed controller is demonstrated experimentally in the context of a concentric tube robot. Results show that the stiffness controller achieves the desired stiffness in steady state, provides good dynamic performance, and exhibits stability during contact transitions.
Url:
DOI: 10.1109/TRO.2011.2105410
PubMed: 24273466
PubMed Central: 3837630
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PMC:3837630Le document en format XML
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<front><div type="abstract" xml:lang="en"><p id="P1">This paper introduces the first stiffness controller for continuum robots. The control law is based on an accurate approximation of a continuum robot’s coupled kinematic and static force model. To implement a desired tip stiffness, the controller drives the actuators to positions corresponding to a deflected robot configuration that produces the required tip force for the measured tip position. This approach provides several important advantages. First, it enables the use of robot deflection sensing as a means to both sense and control tip forces. Second, it enables stiffness control to be implemented by modification of existing continuum robot position controllers. The proposed controller is demonstrated experimentally in the context of a concentric tube robot. Results show that the stiffness controller achieves the desired stiffness in steady state, provides good dynamic performance, and exhibits stability during contact transitions.</p>
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