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Related Concept Videos

Impact: Problem Solving01:26

Impact: Problem Solving

In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...

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Modified Drop Tower Impact Tests for American Football Helmets
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Evaluating Polo Helmet Performance Across Different Impact Test Systems.

Nicole E-P Stark1, Mark T Begonia2, Steve Rowson3

  • 1Department of Biomedical Engineering and Mechanics, Virginia Tech, 325 Stanger St., Kelly Hall 120, Blacksburg, VA, 24061, USA. nestark@vt.edu.

Annals of Biomedical Engineering
|April 17, 2025
PubMed
Summary
This summary is machine-generated.

Different helmet impact test systems show varied head impact responses, affecting concussion risk. Choosing the right system requires matching lab tests to real-world polo impacts for accurate helmet evaluation.

Keywords:
Helmet testingNOCSAEObliquePendulumPolo helmetsRotation

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Area of Science:

  • Biomechanics
  • Sports Engineering

Background:

  • Helmet testing systems are crucial for evaluating head impact protection.
  • Standardized testing is needed to ensure laboratory results reflect real-world scenarios.

Purpose of the Study:

  • To compare head impact response across different helmet testing systems.
  • To evaluate the performance of ten polo helmets using three distinct impact test systems.

Main Methods:

  • Ten polo helmets were tested using a twin-wire guided drop tower, an oblique drop tower, and an impact pendulum.
  • Impacts were conducted at matched locations and speeds (3.46, 5.46 m/s).
  • Peak linear acceleration (PLA), peak rotational acceleration (PRA), peak rotational velocity (PRV), and concussion risk were analyzed using mixed-effects models.

Main Results:

  • Distinct differences in PRA and concussion risk were observed between oblique and pendulum systems.
  • Helmet responses varied significantly across test systems under identical impact conditions.
  • Despite system differences, a consistent rank order of helmet performance was noted.

Conclusions:

  • Helmet testing systems yield different head impact responses, influencing concussion risk assessment.
  • Selecting an appropriate test system necessitates considering sport-specific impact conditions for accurate real-world representation.