Comparison between control-based continuation and phase-locked loop methods for the identification of backbone curves and nonlinear frequency responses
Author(s)
Type
Conference Paper
Abstract
Control-based continuation (CBC) and phase-locked loops (PLL) are two experimental testing methods that have demonstrated great potential for the non-parametric identification of key nonlinear dynamic features such as nonlinear frequency responses and backbone curves. Both CBC and PLL exploit stabilizing feedback control to steer the dynamics of the tested system towards the responses of interest and overcome important difficulties experienced when applying conventional testing methods such as sine sweeps to nonlinear systems. For instance, if properly designed, the feedback controller can prevent the system from exhibiting untimely transitions between coexisting responses or even losing stability due to bifurcations. This contribution aims to highlight the similarities that exist between CBC and PLL and present the first thorough comparison of their capabilities. Comparisons are supported by numerical simulations as well as experimental data collected on a conceptually simple nonlinear structure primarily composed of a thin curved beam. The beam is doubly clamped and exhibits nonlinear geometric effects for moderate excitation amplitudes.
Date Issued
2021
Date Acceptance
2020-09-01
Citation
2021, pp.75-78
ISBN
9783030476250
ISSN
2191-5644
Publisher
Springer International Publishing
Start Page
75
End Page
78
Copyright Statement
© The Society for Experimental Mechanics, Inc 2021. The final publication is available at Springer via https://doi.org/10.1007/978-3-030-47626-7_11
Sponsor
Royal Academy of Engineering
Royal Academy Of Engineering
Identifier
https://link.springer.com/chapter/10.1007%2F978-3-030-47626-7_11
Grant Number
RF1516/15/11
RF1516/15/11
Source
38th IMAC, A Conference and Exposition on Structural Dynamics 2020
Publication Status
Published online
Coverage Spatial
Online
Date Publish Online
2020-09-13