Lecture: Prof. Olgac, University of Connecticut

Publikováno: 29. 11. 2017

Prof. Olgac from University of Connecticut will hold a lecture on A JOURNEY ON TIME-DELAYED SYSTEMS, THEORETICAL FUNDAMENTALS MEET PRACTICE. It will be on December 12 at 9:00 at the Faculty of Mechanical Engineering in Conference room No. 17 – Faculty of Mechanical Engineering, CTU in Prague, Technická 4, Prague 6

You are cordially invited.


Time-delayed systems started to tickle the fancy of practitioners for over six decades in the machine tool’s regenerative chatter area while mathematicians were at it as well. These two groups were almost intentionally decoupled, although the research objectives had a lot in common and ironically within the same chronological time span.  In this presentation we wish to take a journey bridging variety of application-based research studies to the theory.  Some industrial problems that await solution and corresponding theoretical developments will be revisited.  Missed opportunities of cross-breeding between the two groups of researchers and potentially fertile new venues will be reviewed.  Interwoven nature of knowledge creation between the practice and theory will be displayed with video clips and numerical simulations.

Several focus points in the talk are as time permits:

  1. A concept of actively tuned vibration absorbers, the “Delayed Resonator (DR)”, which is directly inspired from machine tool chatter phenomenon, 
  2. Cluster Treatment of Characteristic Roots (CTCR) paradigm and its impact on single and multiple delay systems,
  3. Chatter stabilization in Simultaneous Machining using “Delay Scheduling” method,
  4. “Spectral Delay” and “Building Block” concepts for multiple and rationally independent delay cases,
  5. Stability of multi-agent swarm control. 
  6. Thermo-acoustic Instability in combustion systems,
  7. Enhanced energy harvesting using DR concept.


Aktuality/12_2017/olgac.jpgNejat Olgac, Dr. Eng. Sci. Columbia Univ. 1976, M.Sc. Technical Univ. of Istanbul, Turkey 1972 (summa-cum-laude), both in Mechanical Engineering.  He was engaged in manufacturing industry in Istanbul (1976-81).  Since 1981 he has been a professor with the Mechanical Engineering Department of the University of Connecticut. 

His research interests are in robust nonlinear controls, active vibration absorption, time-delayed systems, micromanipulation in bio-engineering. Dr. Olgac holds four patents, three on the Delayed Resonator active vibration suppression technique (1995-1996-1999)  and a fourth one on anti-chatter concepts in simultaneous machining (2011). He is the director of Advanced Laboratory for Robotics, Automation and Manufacturing (ALARM) at UConn.

Dr. Olgac was Visiting Professor at INRIA (Sophia-Antipolis, France) 1988-89, SEW Eurodrive Fellow - Guest Professor at Technical Univ. of Munich, Germany in 1995-96, Visiting Professor at Harvard University 2002-03, and at Czech Tech. Univ. Prague 2017-18. He served on the editorial board of the ASME Trans. of Dynamic Systems, Measurement and Control (1996-2004), and the guest editor of the Special Issue of JDSMC on Time Delayed Systems (June, 2003), is presently on the Editorial Boards of  IEEE, Tran. Control System Technology, J. Vibration and Control, Int. J. of Mechatronics and Manufacturing Systems.

He also served a member and later as the Chairman of the Executive Committee of the ASME Dynamic Systems and Control Division (2001-6). He was the General Chair of IFAC Time Delay Systems Workshop (TDS) 2012, and General Chairman of ASME Dynamic Systems and Controls Conference, DSCC 2013.  He was a member of the ASME Systems and Design Group Operating Board, he also served on the A2C2 (American Automatic Control Council) Board of Directors 2013-16. He is the recipient of a UCONN Research Excellence Award (2015) and ASME Distinguished Engineer of the Year, Hartford Chapter, CT (2015). Prof. Olgac is a member of the Connecticut Academy of Science and Engineering (CASE), Fellow of ASME and Senior Member of IEEE.