A Graphical Design Approach for Two-Input Single-Output Systems Exploiting Plant/Controller Alignment: Design and Application

Weir, Nathan A.; Alleyne, Andrew G.

doi:10.1115/1.4044717

Title: A Graphical Design Approach for Two-Input Single-Output Systems Exploiting Plant/Controller Alignment: Design and Application

Journal Article · 16 October 2019 · Journal of Dynamic Systems, Measurement, and Control

DOI: https://doi.org/10.1115/1.4044717 · OSTI ID:1570278

Weir, Nathan A. ^[1]; Alleyne, Andrew G. ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)

Due to the unique structure of two-input single-output (TISO) feedback systems, several closed-loop properties can be characterized using the concepts of plant and controller “directions” and “alignment.” Poor plant/controller alignment indicates significant limitations in terms of closed-loop performance. In general, it is desirable to design a controller that is well aligned with the plant in order to minimize the size of the closed-loop sensitivity functions and closed-loop interactions. Although the concept of alignment can be a useful analysis tool for a given plant/controller pair, it is not obvious how a controller should be designed to achieve good alignment. We present a new controller design approach, based on the PQ method (Schroeck et al., 2001, “On Compensator Design for Linear Time invariant Dual-Input Single-Output Systems,” IEEE/ASME Trans. Mechatronics, 6(1), pp. 50–57), which explicitly incorporates knowledge of alignment into the design process. Here, this is accomplished by providing graphical information about the alignment angle on the Bode plot of the PQ frequency response. We show the utility of this approach through a design example.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: Sandia University Programs; USDOE

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1570278

Report Number(s):: SAND--2019-10667J; 679243

Journal Information:: Journal of Dynamic Systems, Measurement, and Control, Journal Name: Journal of Dynamic Systems, Measurement, and Control Journal Issue: 1 Vol. 142; ISSN 0022-0434

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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