anticache

1st Research Seminar for Doctoral Candidates this Winter semester

17.10.2019


The first research seminar this winter semester includes two presentations for the upcoming IROS conference: 

Florian Bergner, Chair for Cognitive Systems on "Evaluation of a Large-Scale Event-Driven Robot Skin" Abstract: This paper evaluates and describes the large-scale integration of our multi-modal event-driven robot skin system on our humanoid robot H1 (REEM-C, PAL robotics). The robot skin is powered by the robot and all processing of tactile perception and control are executed onboard the robot. The robot skin system largely covers the humanoid and employs 1260 skin cells in 47 skin patches, in total 7560 multi-modal tactile sensors. The robot skin system is driven by events, i.e. the occurrence of novel information drives the acquisition, transmission, and processing of information rather than the synchronous sampling clock as in clock-driven systems. The event-driven robot skin system enables efficient multi-modal large-area tactile perception which is a prerequisite for realizing reactive whole-body control. We analyze the new robot skin system and evaluate its performance in clock-driven mode and event-driven mode. This analysis includes modeling the required CPU load and investigating the scaling of the system in multi-core systems. We evaluate the robot skin system with an experiment, where a large number of skin cells is activated (>680 cells), and a large number of events is generated. The obtained results demonstrate the superior performance of the event-driven system. In the clock-driven mode, the robot skin system constantly produces 315,000 packets/s, while in event- driven mode the system at most produces 40,000 packets/s (13%). The CPU load reduces from constantly 270% to at most 100% (37%). In clock-driven mode, the PC drops on average 80,000 packets/s (25% of all packets), while in event-driven mode, the package loss is practically neglectable. This efficient large-scale robot skin enables the complete onboard integration into a humanoid robot without the need for additional external power or processing capabilities.

Julio Rogelio Guadarrama Olvera, Chair for Cognitive Systems on "Pressure-Driven Body Compliance Using Robot Skin"

Abstract: Skin can provide rich multi-modal contact information about the interaction forces of a robot with its environment. With this new way of sensing, a new generation of compliant controllers can be developed to enable different kinds of interactions. In this paper, a pressure-driven compliance controller is presented to generate virtual compliant forces depending on both external contact forces and their area of contact. The proposed controller can be adapted for any skin technology that provides a spatial distribution of force sensors over the surface of a robot and the geometry of the contact areas. This modality of body compliance is formulated as a task function which can be inserted in strict or non-strict hierarchical task execution policies. The controller was tested on the upper body of a Humanoid robot (16 DoF) covered with robot skin.

The main talk will be preceded by a 3-min pitch presentation (16:30-16:35h) of an MSNE student: Cristina Gil Avila – "Dynamics of resting-state EEG in chronic pain patients"

Date: 23 October 2019, 16:30h, ICS Karlstraße 45, 2. Floor, room 2026