Robustness of adaptive, multistable structures under combined harmonic and stochastic loads

Ryan L. Harne, Quanqi Dai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Multistability is a characteristic that can introduce exceptional versatility in engineered structural systems. For such adaptive structures, multiple stable equilibria empower a means for large shape change, mechanical properties tuning, and dynamic response tailoring, all potentially free from the costs and complexity associated with sustained active controls and hardware. As a result, a comprehensive understanding on the sensitivities of transitioning between the stable equilibria of multistable structures is needed to effectively leverage the valuable adaptation mechanisms. Previous characterizations provided useful insights on the dynamic sensitivities to snapthrough of bi-or multistable structures under either harmonic or stochastic excitations, but the more practical combination of harmonic and stochastic loading has not received close attention. To provide a more complete understanding on the robustness of adaptive, multistable structures under complex excitations, this research explores new methods to quantify the likelihood of triggering the dynamic transitions between stable equilibria in an archetypal, magnetoelastic, bistable cantilever beam due to combined harmonic and stochastic loading. The studies capture the myriad, steady-state dynamic response regimes and susceptibilities of the bistable architecture to suddenly transition to another stable equilibria, or back again, due to various levels of additive white noise in the total excitation spectra. It is discovered that when the harmonic excitation component occurs at a frequency close to the linearized resonance the additional noise excitation rapidly disables the persistent periodic snapthrough dynamics, resulting in locally stable intrawell oscillation. On the other hand, the extra noise may drastically compromise the integrity of locally stable periodic responses that occur at frequencies around one-half of the linearized resonance. By addressing the previous unknowns regarding more realistic excitation spectra, these new insights and assessment methods provide important guidance towards effective implementation of bistable constituents in adaptive structures applications.

Original languageEnglish (US)
Title of host publication28th Conference on Mechanical Vibration and Noise
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791850206
DOIs
StatePublished - 2016
EventASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2016 - Charlotte, United States
Duration: Aug 21 2016Aug 24 2016

Publication series

NameProceedings of the ASME Design Engineering Technical Conference
Volume8

Other

OtherASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2016
CountryUnited States
CityCharlotte
Period8/21/168/24/16

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Computer Graphics and Computer-Aided Design
  • Computer Science Applications
  • Modeling and Simulation

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