In order to strengthen our dedicated team in the Robotics Innovation Center (RIC) research department in Bremen we are looking for a
(full-time/part-time, 6 – 9 months)
The Robotics Innovation Center research department, headed by Prof. Dr. Dr. h.c. Kirchner, develop robot systems that are used for complex tasks on land, under water, in the air, and in space. The recently established underactuated lab at DFKI-RIC is looking for outstanding students to join us in pushing the boundaries of highly dynamic and agile robots.
Series-parallel hybrid architecture can offer superior dynamic performance in contrast to traditional serial robots . These robots are typically position controlled due to challenges in their modeling. When equipped with real time dynamic control, often a simplified inverse dynamic model of these systems is utilized. The trade-offs of this model simplification were reported in  for the first time by studying the inverse dynamics of a series-parallel humanoid leg which has been recently developed at DFKI-RIC. This thesis plans to extend the work in [2, 3] by studying the effect of model simplification on the forward dynamics of the system and develop methods for automatically discovering reduced order models for complex systems. The work will be applied to the analysis of complex systems such as Recupera exoskeleton and RH5 humanoid.
Mathematical: Rigid body kinematics and dynamics, basic control theory.
Programming: C/C++, Python, experience with multi-body dynamics simulations software (e. g. ADAMS, RecurDyn etc)
1. Shivesh Kumar, Hendrik Wöhrle, José de Gea Fernández, Andreas Müller, Frank Kirchner, A survey on modularity and distributivity in series-parallel hybrid robots, Mechatronics, Volume 68, 2020, 102367, ISSN 0957-4158, https://doi.org/10.1016/j.mechatronics.2020.102367.
2. Kumar, S., Szadkowski, K. A. V., Mueller, A., and Kirchner, F. (February 6, 2020). "An Analytical and Modular Software Workbench for Solving Kinematics and Dynamics of Series-Parallel Hybrid Robots." ASME. J. Mechanisms Robotics. April 2020; 12(2): 021114. https://doi.org/10.1115/1.4045941
3. S. Kumar, J. Martensen, A. Mueller and F. Kirchner, "Model Simplification For Dynamic Control of Series-Parallel Hybrid Robots - A Representative Study on the Effects of Neglected Dynamics Shivesh," 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Macau, China, 2019, pp. 5701-5708, doi: 10.1109/IROS40897.2019.8967786.
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