Date: March 16, 2012
Time: 12 noon - 1 PM
Place: Tesla room 53-125, Engr IV
Networked control over wireless sensor and actuator systems is of growing importance in many application domains. Energy and communication bandwidth are scarce resources in such systems. Despite that feedback control might only be needed occasionally, sensor and actuator communications are often periodic and with high frequency in today's implementations. In this talk, resource-constrained wireless networked control systems with an adaptive sampling period are considered. We consider a system architecture for aperiodic wireless networked control. As the underlying data transmission is performed over a shared wireless network, we identify scheduling policies and medium access controls that allow for an efficient implementation of sensor communication. We experimentally validate three proposed mechanisms and show that the best performance is obtained by a hybrid scheme, combining the advantages of event- and self-triggered control as well as the possibilities provided by contention-based and contention-free medium access control.
Finally, I will give an overview of the testbeds on wireless process control, energy efficient buildings and multi-agent systems at the Automatic Control Lab in KTH.
Jose Araujo received his Masters degree on Electrical and Computer Engineering from the Faculty of Engineering, University of Porto (FEUP), Portugal in 2008. In the Fall 2008 he was a visiting researcher at the University of British Columbia (UBC), Vancouver, Canada, under the supervision of Vikram Krishnamurthy. In February 2009 he started his PhD at the Automatic Control Lab in the Royal Institute of Technology (KTH) under the supervision of Karl Henrik Johansson and Henrik Sandberg. He obtained his Tecn. Licentiate degree in October 2011 from KTH. From February to July 2012 he is a visiting PhD student at the Cyber-Physical Systems Lab at the University of California Los Angeles (UCLA) under the supervision of Paulo Tabuada.
More information at www.ee.kth.se/~araujo