Impact of vertical vibrations on human rhythmic jumping
Impact of vertical vibrations on human rhythmic jumping
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DOI：
10.1016/j.istruc.2023.105154
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发表时间：
2023-11
期刊：
影响因子：
4.1
通讯作者：
Nimmy Mariam Abraham;Genevieve Williams;S. Z̆ivanović
中科院分区：
文献类型：
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作者：
Nimmy Mariam Abraham;Genevieve Williams;S. Z̆ivanović
本文从动力学和运动学的角度研究了人在垂直振动平台上完成节奏跳跃的能力。10名测试对象参加，在非振动和振动平台上进行跳跃。使用2.0、2.4和2.8 Hz的振动频率，振动水平为2 m/s2。跳跃的频率与振动频率相匹配，并且第一次相对于振动周期中平台的位置对跳跃进行计时。节拍器提示着陆在四个目标位置：（i）参考位置和下降途中（中间下降），（ii）最低位置（波谷），（iii）参考位置和上升途中（中间上升），以及（iv）最高位置（峰值），在每个频率。该研究比较了非振动和振动平台条件下每种频率的跳跃目标频率的实现情况。结果显示，当目标频率为2.8 Hz时，在非振动平台上的性能最差，证实了在非振动表面上更快跳跃的困难。离散相对相位分析揭示了在振动平台上的波谷和中间位置着陆的偏好，特别是在2.8 Hz。跳跃的首选时间对应于更大的脚趾间隙和冲击比，但较短的接触时间相比，非振动平台。这些研究结果为改善体育和音乐活动中使用的装配结构的人-结构交互模型提供了希望。
This paper investigates the human ability to perform rhythmic jumping on a vertically vibrating platform by analysing kinetics and kinematics. Ten test subjects participated, performing jumping on both non-vibrating and vibrating platforms. Vibration frequencies of 2.0, 2.4, and 2.8 Hz were used, with a vibration level of 2 m/s2. The frequency of jumping matched the vibration frequency, and for the first time, the jumps were timed relative to the platform's position in the vibration cycle. A metronome prompted landings at four target positions: (i) reference position and on the way down (mid-down), (ii) lowest position (trough), (iii) reference position and on the way up (mid-up), and (iv) highest position (peak), at each frequency. The study compared the achievement of the target frequency of jumping between non-vibrating and vibrating platform conditions for each frequency. Results showed the worst performance when the target frequency was 2.8 Hz on the non-vibrating platform, confirming the difficulty of faster jumping on non-vibrating surfaces. The discrete relative phase analysis revealed a preference for landing at the trough and mid-up positions on the vibrating platform, particularly at 2.8 Hz. The preferred timing of jumps corresponded to greater toe clearance and impact ratio, but shorter contact duration compared to the non-vibrating platform. These findings hold promise for improving human-structure interaction models for assembly structures used in sports and musical events.