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相关概念视频

General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

545
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
545

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相关实验视频

Updated: Feb 26, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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一个肌肉驱动的腰椎模型,用于预测振动诱导的脊柱负荷,具有自适应控制.

Jiahao Zhou1,2, Chaojie Fan1, Yingli Li1

  • 1School of Traffic & Transportation Engineering, Central South University, Changsha, 410075, China.

Annals of biomedical engineering
|February 25, 2026
PubMed
概括

这项研究开发了一种肌肉驱动的脊柱模型,以更好地了解全身振动 (WBV) 如何导致腰部疼痛. 该模型揭示了减少振动和增加脊柱负荷之间的权衡,这对于预防受伤至关重要.

关键词:
生物动力学就是生物动力学.反的控制反的控制.这是由肌肉驱动的.肌肉骨系统的疾病脊柱的负荷是背脊的负荷.整个身体的振动.

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相关实验视频

Last Updated: Feb 26, 2026

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科学领域:

  • 生物力学 生物力学
  • 职业健康 职业健康 职业健康
  • 脊柱负荷分析

背景情况:

  • 全身振动 (WBV) 暴露是腰部疼痛的重要原因之一.
  • 由于简化的假设,现有的计算模型在预测动态脊柱负载时缺乏准确性.
  • 了解将WBV与脊柱负荷联系在一起的生物力学机制对于开发有效干预措施至关重要.

研究的目的:

  • 开发和验证一个肌肉驱动的腰椎模型.
  • 整合脊椎间关节的非线性机械特性和自适应反控制.
  • 为了准确预测WBV暴露下的动态脊柱负荷.

主要方法:

  • 采用了混合逆向前进动态框架.
  • 一个自适应的比例积分导数 (PID) 控制算法动态分配肌肉刺激.
  • 该模型根据体内内压力和电肌图数据进行了验证.

主要成果:

  • 该模型与体内数据 (r > 0.9) 有很好的一致性.
  • 积极的肌肉控制改变了共振频率和减少了振动传导能力.
  • 确定了一个权衡:降低传导能力增加了在共振时的腰部压缩负荷.

结论:

  • 这种经过验证的框架增强了对振动诱导的脊柱生物力学的评估.
  • 它提供了与WBV暴露相关的损伤途径的见解.
  • 这些发现可以为制定有针对性的人体工程学干预措施提供信息.