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A heuristic model-based approach for compensating wind effects in ski jumping.

Alexander Jung1, Wolfram Müller2, Mikko Virmavirta3

  • 1Medical University of Graz, Gottfried Schatz Research Center for Cell Signaling, Metabolism and Aging - Division of Biophysics, Neue Stiftingtalstr. 6/IV, 8010 Graz, Austria.

Journal of Biomechanics
|July 7, 2021
PubMed
Summary
This summary is machine-generated.

Ski jumping wind compensation is fairer with a new mechanistic model. This approach accurately estimates wind

Keywords:
AerodynamicsComputer simulationInverse dynamicsMathematical modellingWind compensation systemWinter sports

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Area of Science:

  • Sports Science
  • Aerodynamics
  • Biomechanics

Background:

  • Ski jumping performance is significantly affected by wind conditions, raising fairness concerns.
  • Current wind compensation systems (International Ski Federation, 2009) use linear statistical models based on averaged wind data, which can yield inaccurate results.
  • The need for a more precise method to assess wind's impact on ski jump length is evident.

Purpose of the Study:

  • To introduce and validate an alternative mathematical wind compensation approach for ski jumping.
  • To develop a method that provides more accurate estimations of wind's effect on jump length compared to existing systems.

Main Methods:

  • Developed a mechanistic model of the ski jump flight phase.
  • Calculated jump length effect as the difference between real jump length and simulated jump length under calm wind conditions.
  • Utilized kinematic and wind velocity data to determine initial flight velocity and aerodynamic coefficients via inverse dynamics.

Main Results:

  • The mechanistic model provides a more accurate estimation of the jump length effect of wind.
  • Accuracy is dependent on measurement errors in kinematic and wind data, not model inaccuracies.
  • This approach overcomes limitations of previous linear statistical models.

Conclusions:

  • The proposed mechanistic model offers a superior method for wind compensation in ski jumping.
  • Accurate aerodynamic and kinematic data are crucial for reliable wind effect estimation.
  • This advancement can lead to fairer ski jumping competitions.