Markus RyllPhD Student
Alumni of the Group Autonomous Robotics and Human-Machine Systems
I am a Ph.D. student with a background in Medical Engineering and Mechatronics. In the group group of (Max Planck Institute for Biological Cybernetics) I am working on the further development of quadcopter control.
Currently I am interested in:
- Micro aerial vehicles (MAV)
- Advances MAV designs
- Quadcopter flight behavior
- Quadcopter control
- Aerial grasping
- Mechanical Engineering
- Software Engineering
Actual I am working on the design of a new Micro aerial vehicle. For more information check my projects.
Micro aerial vehicles (MAVs) are an increasingly important research field. On the one hand, the idea of using MAVs in cluttered indoor environments and for rescue and surveillance tasks is becoming increasingly popular. On the other hand, the development of new MAV concepts and the related control issues represent scientific challenges. For instance: what is necessary to control a micro aerial vehicle in an unknown and cluttered environment? What are the requirements for such a MAV? What kind of sensor inputs is necessary and what kind of autonomy is needed? Shall the MAV be completely autonomous or under the supervision of a human operator as in teleoperation scenarios?
Custom quadrotor helicopters have the drawback of being underactuated: they only possess four independent control inputs w.r.t. their 6-dof pose in space. A rotation in roll or pitch causes a Cartesian acceleration into the same direction. As a consequence, it can be proven that quadrotors are only able to independently act on their Cartesian position and yaw angle, this means 4 dofs. This imposes some limitations. For example, a sensor or gripper attached to the robot cannot be arbitrarily oriented during flight nor the quadrotor can hover in place with any body orientation. In the Human-Robot-Interaction group, we are developing a new kind of MAV. Based on the concept of a quadrotor helicopter with four propellers, we extend this design to allow the four propellers to tilt about their axes w.r.t. the quadrotor body. This gives us full control over the 6 dofs of the quadrotor body, and better chances to interact with and manipulate the environment.
Starting from first principles, we aim at deriving a realistic dynamical model of our envisage quadrotor and at devising advanced nonlinear controllers which can exploit the additional actuated degrees of freedom. Inertial and aerodynamics effects will also be considered in order to improve the realism of the model. Besides providing a matlab implementation, we will also port the quadrotor model into our own real-time multi-robot simulation environment with a physically realistic engine.
In a future step, we plan to build a prototype of this new quadrotor concept in order to test and validate in real conditions both the models and controllers obtained during the simulation stage. To this end, we will make use of our two Flying-Arenas equipped Vicon tracking systems for obtaining an external ground truth.
We developed a dynamic model of the quadrotor with actuated propellers and devised a nonlinear controller based on dynamic feedback linearization. Simulation results confirm the validity of our methods.
The Human-Robot-Interaction group develops a new kind of quadrotor helicopter with tilt rotors to control all 6 Cartesian space dofs. This MAV will be able to interact with and manipulate the environment.
2010 - now Ph.D. Student
supervised by Dr. Paolo Robuffo Giordano
Department Human Perception, Cognition and Action (Dept. Head: Heinrich H. Buelthoff), Max Planck Institute for Biological Cybernetics, Tübingen, Germany
2008 2010 Master Student
Medical Engineering - University of Applied Science Ulm (Grade 1.2)
2005 2008 Diploma Student
Mechatronics - Baden-Württemberg Cooperative State University, Karlsruhe (Grade 1.5)
1995 2004 High School Student
2011 now Teaching Activity, Stuttgart
Lecturer for Applied Mechanics at Baden-Württemberg Cooperative State University, Stuttgart
2009 2010 Karolinska Institute, Stockholm
Development and apply of Fourier and single particle refinement methods in the determination of protein structures from poorly ordered two-dimensional protein crystals at Department of Biosciences and Nutrition.
2005 2008 Forschungszentrum Karlsruhe GmbH
Development of mechanical constructions, electronics and software (computer vision) for the autonomic service robot KASPER at the Institute of Applied Computer Science, Karlsruhe