Method of and apparatus for evaluating the performance of a...

Data processing: measuring – calibrating – or testing – Measurement system – Performance or efficiency evaluation

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C702S066000, C702S067000, C702S068000

Reexamination Certificate

active

07865334

ABSTRACT:
A method of evaluating the performance of a control system using a computerized device includes calculating a ratio of a first area and a second area associated with a peak value of a signal associated with the control system, comparing the ratio with a predetermined value for the ratio, determining a cause of oscillation in the control system based on the comparison of the ratio with the predetermined value for the ratio, and providing a diagnosis of the cause of oscillation in the control system.

REFERENCES:
patent: 5719788 (1998-02-01), Seborg et al.
patent: 7289936 (2007-10-01), Singhal et al.
patent: 7542876 (2009-06-01), Singhal et al.
International Search Report for Application No. PCT/US2005/022127; mailed Oct. 27, 2005; 2 pgs.
Armstrong-Hélouvry, B., DuPont, P. and Canudas de Wit, C. (1994), “A Survey of Models, Analysis Tools and Compensation Methods for the Control of Machines With Friction”,Automatica, 30, (pp. 1083-1138.
Bialkowski, W. L. (1992), “Dreams vs. Reality: A View From Both Sides Of The Gap”,Control Systems '92 Conference. Whistler, BC, Canada, (pp. 283-295).
Brockwell, Peter J. and Davis, Richard A. (2002),Introduction to Time Series and Forecasting, 2nd edition, Springer, NY, (pp. 139-140).
Choudhury, M.A.A.S., Shah, S.L. and Thornhill, N. F. (2004a), “Diagnosis of Poor Control Loop Performance using Higher Order Statistics”,Automatica(to appear in Jun. 2004), (pp. 1-14).
Choudhury, M.A.A.S., Thornhill, N.F. and Shah, S.L. (2004b), “A Data-Driven Model for Valve Stiction”, InProc. IFAC ADCHEM2003, Hong Kong, (6 pgs).
Desborough, L., Nordh, P. and Miller, R. (2001), “Control System Reliability: Process Out Of Control”,Industrial Computing, (August), (pp. 52-55), http://www.loopscout.com/Info/Intech.pdf.
Forsman, K., Stattin, A. (1999), “A new criterion for detecting oscillations in control loops”, Proceedings of European Control Conference. Karlsruhe, Germany. CP8-3, (4 pgs).
Gerry, J. and Ruel, M. (2001), “How To Measure And Combat Valve Stiction On Line”, InProc. ISA2001. Houston, TX:Instrumentation, Systems and Automated Society, 4 pgs.).
Horch, A., (1999), “A simple method for detection of stiction in control valves”,Control Eng. Practice, 7, (pp. 1221-1231).
Horch, A., (2000), “Condition Monitoring of Control Loops”, Ph.D. dissertation, Royal Institute of Technology, Stockholm, Sweden. http://www.lib.kth.se/Fulltext/horch001204.pdf., (216 total pgs.).
Horch, A. and Isaksson, A. J., (1998), “A Method for Detection Of Stiction in Control Valves”, InProc. IFAC Workshop on On-line Fault Detection and Supervision in Chemical Process Industry, Lyon, France, session 4B, (6 pgs).
Kedem, B., (1994),Time Series Analysis by Higher Order Crossings, IEEE Press, NY, (pp. 1477-1493).
Miao, T. and Seborg, D. E., (1999), “Automatic Detection of Excessively Oscillatory Feedback Control Loops”, Proceedings of the 1999 IEEE International Conference on Control Applications. Hawaii, USA, (pp. 359-364).
Ruel, M., (2000), “Stiction: The Hidden Menace”,Control Magazine, 13 (11), (pp. 1-11), http://www.expertune.com/articles/RuelNov2000/stiction.html.
Ruel, M., (2002), “Valve Diagnosis Identifies Process Problems”, InProc. ISA Western Regional Conf. and Exhibition, Las Vegas, NV, http://www.topcontrol.com/en/papers.htm., (10 pgs.).
Stenman, A., Gustafsson, F. and Forsman, K., (2003), “A segmentation-based method for detection of stiction in control valves”,Intl. J. Adaptive Control&Signal Processing, 17, (pp. 625-634).
Thornhill, N. F. and Hägglund, T., (1997), “Detection and Diagnosis Of Oscillations in Control Loops”,Control Engr. Practice, 5, (pp. 1343-1354).

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method of and apparatus for evaluating the performance of a... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of and apparatus for evaluating the performance of a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for evaluating the performance of a... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2697198

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.