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Title: Adaptive relay autotuning under static and non-static disturbances with application to friction stir welding

Journal Article · · ISA Transactions
ORCiD logo [1];  [2]
  1. Brigham Young Univ., Provo, UT (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Brigham Young Univ., Provo, UT (United States)
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When a traditional relay feedback test is biased, asymmetry is induced, erroneous system identification occurs, and the test may stop oscillating. Adaptive methods which restore symmetry to the relay test are developed, and additional methods are presented to detect and recover from a non-oscillation condition. This is demonstrated both in simulation and in a process with significant transients and disturbances - friction stir welding (FSW). In testing, it is shown that the adaptive method is able to restore symmetry even in the presence of severe and changing disturbances, including after the weld plunge where temperature gradients change rapidly. Finally, these improvements enable system identification of systems such as FSW in a more robust and accurate manner.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1646635
Report Number(s):
PNNL-SA-152059
Journal Information:
ISA Transactions, Vol. 97; ISSN 0019-0578
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (21)

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Asymmetric relay autotuning – Practical features for industrial use journal September 2016
Subspace identification with non-steady Kalman filter parameterization journal September 2014
Use of biased-relay feedback for system identification journal April 1996
A Note on Relay Feedback Identification Under Static Load Disturbances journal January 2015
Improved Autotuning Using the Shape Factor from Relay Feedback journal May 2002
Parameter estimation from relay autotuning with asymmetric limit cycle data journal August 2001
Combined Temperature and Force Control for Robotic Friction Stir Welding journal January 2014
Getting More Information from Relay-Feedback Tests journal September 2001
A tutorial review on process identification from step or relay feedback test journal November 2013
Toward Automation of Friction Stir Welding Through Temperature Measurement and Closed-Loop Control journal October 2011
Relay feedback auto-tuning of process controllers — a tutorial review journal January 2002
Relay feedback method under large static disturbances journal February 2006
An overview of subspace identification journal September 2006
Autotune Identification under Load Disturbance journal January 1996
Effect of welding processes on tensile properties of AA6061 aluminium alloy joints journal January 2009

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42 ENGINEERING
relay feedback test
auto tuning
system identification
friction stir welding
temperature control