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相关概念视频

Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
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Ankle Joint01:10

Ankle Joint

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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Experimental Methods to Study Human Postural Control
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手架上的部角度改变了多关节可变性的模式.

Roman Farana1, Pavel Brtva1, Gareth Irwin1,2

  • 1Department of Human Movement Studies, University of Ostrava, Czech Republic.

Journal of motor behavior
|September 22, 2025
PubMed
概括

在手架上,延伸的部角度提供了最大的稳定性,通过将质量中心 (CM) 移动最小化. 这种姿势在体操中是首选的,因为它与减少关节变化的联系.

关键词:
演技表演 演技表演这是一个平衡的平衡,平衡的平衡.发动机控制器的控制器保持直立的姿势.

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科学领域:

  • 生物力学 生物力学
  • 人类运动科学科学 人类运动科学
  • 运动科学 运动科学 运动科学

背景情况:

  • 手站稳定对于体操运动员来说至关重要.
  • 子姿势对整体身体稳定性的影响尚未完全理解.
  • 了解与质量中心 (CM) 相关的关节变异性是性能的关键.

研究的目的:

  • 为了研究不同的部角度 (延伸,中性,曲) 如何影响手站时的质量中心 (CM) 稳定性.
  • 分析经验丰富的女体操运动员的部角和关节角变化之间的关系.
  • 为了确定特定的关节角度变化对CM运动在不同部姿势中的贡献.

主要方法:

  • 七名精英女体操运动员用三个部姿势进行了手站:伸展,中立和曲.
  • 使用3D运动捕捉技术收集动力数据.
  • 对关节角度 (手腕,肘部,肩部,部,部) 和CM位置进行了可变性分析.

主要成果:

  • 延伸的部角度姿势显示了最低的CM变异性,与其在体操中的常见使用相关.
  • 关节角度变化与CM运动有显著的相关性. 延伸部角度主要涉及肩膀 (33%),手腕 (23%) 和部 (21%) 的变化.
  • 中性部角度与部变异性 (32%) 有中度的相关性,而曲的部角度严重依赖部角度变异性 (63%).

结论:

  • 子角度在手立姿势变化中起着重要作用.
  • 关节角度变化,视觉信息和强力反射调节部角度对手架稳定的影响.
  • 优化部姿势可以提高体操运动员的手站性能和稳定性.