Repository logo

ESE - Publicações em Proceedings Indexadas à WoS/Scopus

Permanent URI for this collection

http://hdl.handle.net/10198/15524

Browse

Browsing ESE - Publicações em Proceedings Indexadas à WoS/Scopus by Subject "Aerodynamics"

Now showing 1 - 2 of 2
  • Analysis of the aerodynamics by experimental testing of an elite wheelchair sprinter
    Publication . Barbosa, Tiago M.; Forte, Pedro; Morais, J.E.; Coelho, Eduarda
    The aim was to compare the resistive forces acting upon an European wheelchair medallist. The coast-down technique was selected to estimate the resistance in the upright position and racing positions with the neck in hyperextension and flexion, respectively. In the upright position, racing position with the neck in flexion and hyperextension the effective surface area was 0.1747, 0.1482 and 0.1456m2, respectively. The coefficient of rolling friction was 0.00119, 0.00489, 0.00618 and the power to overcome drag 26.62, 22.59, 22.19W for the same positions. As a conclusion, the resistance acting upon the sprinter is different according to his position on the chair. Slight changes in the head position over the race can affect by almost 2% the power output.
    2016Conference paper Open access Show more
  • Comparison of the World and European Records in the 100m Dash by a Quasi-Physical Model
    Publication . Barbosa, Tiago M.; Forte, Pedro; Marinho, D.A.; Reis, Victor M.
    The aim was to employ a quasi-physical model to analyse the performance and biomechanics of the World and European records at the 100m dash in Athletics. At the time of this research, the World record was hold by Usain Bolt (Jamaica) with 9.58s and the European record 9.86s by Francis Obikwelu (Portugal). The analysis of the performance employs a quasi-physical model that feature the drive, maintenance, velocity and drag terms. Obikwelu showed a slower start (drive term) and Bolt a lower rate of deceleration over the race (propulsive term). The velocity and drag terms were higher for Bolt. Correcting the race time for a hypothetical null wind speed, Bolt´s time would have been 9.62s (i.e. a 0.04s impairment) and 9.89s for Obikwelu (i.e. a 0.03s impairment).
    2016Conference paper Open access Show more