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

Taysom, Brandon S.; Sorensen, Carl D.

doi:10.1016/j.isatra.2019.08.014

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

Journal Article · Wed Aug 07 00:00:00 EDT 2019 · ISA Transactions

DOI:https://doi.org/10.1016/j.isatra.2019.08.014· OSTI ID:1646635

^[1]; Sorensen, Carl D. ^[2]

Brigham Young Univ., Provo, UT (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Brigham Young Univ., Provo, UT (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (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, Journal Name: ISA Transactions Vol. 97; ISSN 0019-0578

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

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

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

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