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相关概念视频

Impact: Problem Solving01:26

Impact: Problem Solving

220
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...
220

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相关实验视频

Updated: May 27, 2025

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
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冲击测试方法模拟由于从站立高度下跌而导致的头部冲击.

Morteza Seidi1, Vincent Caccese2, Marzieh Memar3

  • 1Department of Mechanical, Aerospace, and Industrial Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.

Medical engineering & physics
|February 20, 2025
PubMed
概括

跌倒是创伤性脑损伤 (TBI) 的主要原因之一. 这项研究发现,带有Hybrid III头部和部组件的落下塔是一种可重复和现实的方法,用于测试头部保护装备对与落有关的冲击的测试.

关键词:
人类形状的测试设备.脑损伤是因为脑损伤.在秋天的秋天,秋天的秋天.冲击测试方法 冲击测试方法

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科学领域:

  • 生物力学 生物力学
  • 伤害预防 预防伤害
  • 保护设备的测试 保护设备的测试

背景情况:

  • 跌倒是创伤性脑损伤 (TBI) 的主要原因之一.
  • 开发有效的头部保护需要现实的测试方法来测试与跌倒有关的头部冲击.
  • 评估头盔的伤害减弱需要经过验证的模拟技术.

研究的目的:

  • 确定和推一种可重复的测试方法来模拟从站立高度下降的头部冲击.
  • 为了比较不同头部撞击测试方法的有效性.
  • 建立一个可靠的模拟来评估保护头盔.

主要方法:

  • 评估和比较四种头部撞击测试方法:全身人形测试装置 (ATD) 降落,带有混合III头部和部的降落塔,ASTM F429/F1446标准,以及带有混合III头部和部的线性撞击器.
  • 评估在摔倒期间模拟头部冲击动力学中的可重复性和现实性.
  • 参数分析包括峰值线性加速,头部损伤标准 (HIC),峰值角加速和峰值角速度.

主要成果:

  • 全身ATD降落系统提供了现实的模拟,但缺乏可重复性.
  • 在可重复的方法中,带有Hybrid III头部和部组件的降落塔在前后冲击中显示出与ATD降落系统在统计学上相似的结果.
  • 这种方法准确地捕获了翻译和旋转头部运动.

结论:

  • 带有混合III头部和部组件的落下塔是一种可重复和现实的测试方法,用于模拟与落相关的头部冲击.
  • 这种经过验证的方法可用于评估头部保护技术的伤害减弱.
  • 这些发现支持开发和测试先进的头盔,以防止落相关的TBI.