MM Seminar: Prof. Jian Peng
16.11.2026 12:15 - 16.11.2026 13:00
BME MM Bldg. I29 (Library)
Time-Delay Dynamics and Vibration Control of Engineering Flexible Structures
Prof. Jian Peng
School of Civil Engineering,
Hunan University of Science and Technology, China
(currently visiting professor at the Universit? Politecnica delle Marche in Italy, working with Prof. Stefano Lenci)
Prof. Peng is the co-organizer (together with prof. Li Zhang from Nanjing
and prof. Insperger) of the Mini-Symposium on Systems with Time Delay (MS-19) at the
12th European Nonlinear Dynamics Conference (ENOC2027) to be held in
Aberdeen, Scotland, UK, on July 19-23, 2027.
See: https://enoc2027.com/
Abstract
Time delays affect the stability and vibration control of engineering
flexible structures. The structures of interest include cables, cable-stayed
beams and cable-stayed bridges. After briefly introducing our early work on
stability and bifurcations in delayed coupled oscillators, this seminar
focuses on two cable studies. The first concerns a magnetorheological
damper?cable system with one-to-one internal resonance between in-plane and
out-of-plane modes. We examine delay-dependent resonant responses and Hopf
bifurcations of the modulation equations governing their slow amplitude and
phase dynamics. The second addresses mode-selective active control of an
in-plane symmetric?antisymmetric mode pair through coordinated placement of
delayed velocity-feedback actuators. Modal feedback coefficients distinguish
the roles of placement, gain and delay. For a symmetric cable, two actuators
placed at mirror-image positions away from modal nodes, with equal gains and
a common delay, cancel feedback-induced cross-modal terms while retaining
direct modal feedback. Intrinsic nonlinear coupling remains. We then extend
the discussion to cable-stayed beams and recent modeling of cable-stayed
bridges, where coupled modes introduce additional interactions and
control-design questions. Analytical and numerical examples are complemented
by existing model experiments illustrating coupled vibration and energy
transfer. The seminar closes with ongoing and planned experimental work on
time-delay implementation and active vibration control, emphasizing
questions for future validation.
