System identification of human leg stiffness during rhythmic jumping on a perceptibly oscillating surface

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Abstract

In recent years, various man-made structures, such as grandstands and footbridges, have shown significant vibration problems during human jumping causing concern for maintenance and serviceability. To understand the interactions observed between a human and a structure, a 5.5m timber beam was constructed and instrumented. This was designed to simulate a cantilever tier of a grandstand, with similar natural frequency and damping ratio to the full-scale structure and with a similar mass ratio of a single human to the beam as for a crowd to the full-scale structure. Measurements of accelerations and displacements of both the jumper and beam, and of the contact force between them, were acquired. Tests for a range of target jumping frequencies, from below to above the structure’s natural frequency, were performed to identify the jumper’s dynamics and the induced vibrations of the structure and to observe interactions. System identification techniques were performed to evaluate and model the human leg mechanics of a jumper on a vertically oscillating surface. Force-displacement curves, for both relative (jumper to beam) and absolute displacements, have been obtained. The corresponding leg spring stiffness has been evaluated using a linear fit. Variations in the stiffness for different jumping frequencies is discussed.
Original languageEnglish
Title of host publicationSystem identification of human leg stiffness during rhythmic jumping on a perceptibly oscillating surface
Place of PublicationNational Technical University of Athens, Greece
PublisherEuropean Conferences on Structural Dynamics
Pages1957-1923
Number of pages11
Volume1
ISBN (Print)9786188507227
Publication statusPublished - 23 Nov 2020

Publication series

NameEURODYN 2020, Volume 1. Proceedings of the XI International Conference on Structural Dynamics
PublisherEURODYN
Number1957-1923
Volume1

Keywords

  • Pedestrian loading
  • Biomechanics
  • Non-linear dynamics
  • human-structure interaction
  • Jumping
  • Experimental system identification

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