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A Lyapunov-Based Approach to Exploit Asymmetries in Robotic Dual-Arm Task Resolution
KTH, Skolan för elektroteknik och datavetenskap (EECS), Robotik, perception och lärande, RPL.ORCID-id: 0000-0003-3252-715X
2019 (engelsk)Inngår i: 58th IEEE Conference on Decision and Control (CDC), 2019Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Dual-arm manipulation tasks can be prescribed to a robotic system in terms of desired absolute and relative motion of the robot’s end-effectors. These can represent, e.g., jointly carrying a rigid object or performing an assembly task. When both types of motion are to be executed concurrently, the symmetric distribution of the relative motion between arms prevents task conflicts. Conversely, an asymmetric solution to the relative motion task will result in conflicts with the absolute task. In this work, we address the problem of designing a control law for the absolute motion task together with updating the distribution of the relative task among arms. Through a set of numerical results, we contrast our approach with the classical symmetric distribution of the relative motion task to illustrate the advantages of our method.

sted, utgiver, år, opplag, sider
2019.
HSV kategori
Forskningsprogram
Elektro- och systemteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-259616OAI: oai:DiVA.org:kth-259616DiVA, id: diva2:1352523
Konferanse
58th IEEE Conference on Decision and Control
Merknad

QC 20190930

Tilgjengelig fra: 2019-09-19 Laget: 2019-09-19 Sist oppdatert: 2019-10-28bibliografisk kontrollert
Inngår i avhandling
1. Dual-Arm Robotic Manipulation under Uncertainties and Task-Based Redundancy
Åpne denne publikasjonen i ny fane eller vindu >>Dual-Arm Robotic Manipulation under Uncertainties and Task-Based Redundancy
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Robotic manipulators are mostly employed in industrial environments, where their tasks can be prescribed with little to no uncertainty. This is possible in scenarios where the deployment time of robot workcells is not prohibitive, such as in the automotive industry. In other contexts, however, the time cost of setting up a classical robotic automation workcell is often prohibitive. This is the case with cellphone manufacturing, for example, which is currently mostly executed by human workers. Robotic automation is nevertheless desirable in these human-centric environments, as a robot can automate the most tedious parts of an assembly. To deploy robots in these environments, however, requires an ability to deal with uncertainties and to robustly execute any given task. In this thesis, we discuss two topics related to autonomous robotic manipulation. First, we address parametric uncertainties in manipulation tasks, such as the location of contacts during the execution of an assembly. We propose and experimentally evaluate two methods that rely on force and torque measurements to produce estimates of task related uncertainties: a method for dexterous manipulation under uncertainties which relies on a compliant rotational degree of freedom at the robot's gripper grasp point and exploits contact  with an external surface, and a cooperative manipulation system which is able to identify the kinematics of a two degrees of freedom mechanism. Then, we consider redundancies in dual-arm robotic manipulation. Dual-armed robots offer a large degree of redundancy which can be exploited to ensure a more robust task execution. When executing an assembly task, for instance, robots can freely change the location of the assembly in their workspace without affecting the task execution. We discuss methods that explore these types of redundancies in relative motion tasks in the form of asymmetries in their execution. Finally, we approach the converse problem by presenting a system which is able to balance measured forces and torques at its end-effectors by leveraging relative motion between them, while grasping a rigid tray. This is achieved through discrete sliding of the grasp points, which constitutes a novel application of bimanual dexterous manipulation.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2019. s. 40
Serie
TRITA-EECS-AVL ; 2019:73
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-263043 (URN)978-91-7873-331-6 (ISBN)
Disputas
2019-11-22, Room F3, Lindstedtsvägen 26, Stockholm, 14:00 (engelsk)
Opponent
Veileder
Merknad

QC 20191105

Tilgjengelig fra: 2019-11-05 Laget: 2019-10-28 Sist oppdatert: 2019-11-18bibliografisk kontrollert

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