One hundred years of wheel shimmy: Why is it still dangerous? - presented by Gabor Stepan

One hundred years of wheel shimmy: Why is it still dangerous?

Gabor Stepan

Gabor Stepan

Associated Nonlinear Dynamics article

S. Beregi et al. (2019) Bifurcation analysis of wheel shimmy with non-smooth effects and time delay in the tyre–ground contact. Nonlinear Dynamics
Article of record
One hundred years of wheel shimmy: Why is it still dangerous?
Gabor Stepan
Gabor Stepan
Budapest University of Technology and Economics

Shimmy is a hard-to-predict vibration phenomenon of towed rolling wheels. Although it appears with low probability, it may cause catastrophic accidents. Low order models of shimmying wheels with single contact point and Coulomb friction exhibit the fundamental phenomenology. Local and global dynamic analyses explore parameter regions with bi-stability, isola, chaotic and transient chaotic oscillations. If there is pneumatic tire on the wheel, a certain time delay effect becomes relevant in the nonlinear dynamics of the system. Experimentally detected micro-shimmy onset is explained by carrying out a non-smooth bifurcation analysis that is related to the nonlinear effect of partial slipping within the tire/ground contact region.

Key Learning Objectives

  • Single wheel shimmy is a dynamic contact paradigm
  • The rich shimmy dynamics originates from the unique combination of the nonlinearly constrained spatial motion of a rigid wheel and the nonlinear elastic contact "where the rubber meets the road”
  • The complex nonlinear phenomena of shimmying wheels are important for controlling new transportation devices like segways, unicycles, rollers, skateboards, snakeboards, powerslides, caster boards, hoverboards
  • The nonlinear dynamics of shimmy can induce low-probability accidents with conventional wheeled transportation devices.

Who Should Attend

  • Mechanical engineers
  • Aerospace engineers
  • Researchers/scientists in mechanical sciences and dynamics
  • Research/Project managers
  • Heads of research divisions in mechanical design, dynamics, tribology
References
  • 1.
    S. Beregi et al. (2019) Bifurcation analysis of wheel shimmy with non-smooth effects and time delay in the tyre–ground contact. Nonlinear Dynamics
  • 2.
    M. Antali and G. Stepan (2019) Nonsmooth analysis of three-dimensional slipping and rolling in the presence of dry friction. Nonlinear Dynamics
  • 3.
    D. Takács et al. (2007) Isolated large amplitude periodic motions of towed rigid wheels. Nonlinear Dynamics
Grants
    Nemzeti Kutatási Fejlesztési és Innovációs HivatalNKFI-128422
Nonlinear Dynamics, an International Journal of Nonlinear Dynamics and Chaos in Engineering Systems logo
Nonlinear Dynamics
Nonlinear Dynamics, an International Journal of Nonlinear Dynamics and Chaos in Engineering Systems
Cite as
G. Stepan (2023, March 15), One hundred years of wheel shimmy: Why is it still dangerous?
Share
Details
Listed seminar This seminar is open to all
Recorded Available to all
Video length 43:05
Q&A Now closed
Disclaimer The views expressed in this seminar are those of the speaker and not necessarily those of the journal