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

Gabor Stepan

Slide at 00:24

NODY Inaugural Webinar, March 15, 2023 @ 11:00 AM EDT
Walter
One hundred years of wheel shimmy: Why is it still dangerous?
Speaker: Prof. Gabor Stepan Department of Applied Mechanics
Budapest University of Technology and Economics
Abstract: 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.
Bio-sketch: Gabor Stepan is a Professor of Applied Mechanics at Budapest University
of Technology and Economics. He is member of the Hungarian Academy of Sciences and the Academy of Europe. He is ERC Advanced Grant holder and the recipient of the
Thomas K. Caughey Dynamics Award of ASME. He is an elected member of the
EuroMech Council, fellow of SIAM and CIRP. His works deal with nonlinear vibrations
and time-delay systems, vibrations of robots, human and robotic balancing, rehabilitation robotics, machine tool vibrations, traffic dynamics, hardware-in-the-loop experiments and
wheel shimmy.

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Summary (AI generated)

Hello everyone, and welcome to our nonlinear dynamics seminar series. I'm Walter Lacarbonara, the editor in chief of nonlinear dynamics. Today, I am excited to introduce this seminar series supported by Springer and hosted by Cassyni. Our goal is to provide a forum for attendees to learn about the latest developments in nonlinear dynamics as published in our journal and to facilitate connections within the community. I want to thank Anita Lekhwani, executive publisher at Springer in New York, for her role in bringing this seminar series to life.

Anita, would you like to share a few words? Thank you for attending today's inaugural seminar. On behalf of Springer Nature, I welcome you to our nonlinear dynamics webinar. This journal has evolved into an institution, showcasing advancements in mechanics and engineering since its inception in 1990. You do not need to be an author to engage with our content and distinguished speakers.

Today's presentation will be hosted by Professor Michael Leamy from Georgia Tech, featuring Professor Gabor Stepan. Michael, would you like to introduce today's speaker? Welcome to Professor Gabor Stepan's lecture on wheel shimmy. Before we begin, the music you heard is "Shimmy Shimmy" by the El Capris from 1956. Our next webinar on May 3rd will feature Professor Bala Balachandran from the University of Maryland discussing data-driven complex dynamics.

Now, let me introduce Professor Gabor Stepan. He is a professor of Applied Mechanics at Budapest University of Technology and Economics, a member of the Hungarian Academy of Sciences, and recipient of the Thomas K Caughey Dynamics Award of ASME. His work focuses on nonlinear vibrations, time delay systems, and various applications in robotics and machine vibrations. Thank you for the introduction, and here is the title page of my presentation on wheel shimmy.