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相关概念视频

Virtual Work for a System of Connected Rigid Bodies01:06

Virtual Work for a System of Connected Rigid Bodies

810
Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
Next,...
810
Virtual Work01:20

Virtual Work

1.5K
The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
1.5K
Principle of Virtual Work: Problem Solving01:13

Principle of Virtual Work: Problem Solving

1.8K
The principle of virtual work is an essential concept in the field of mechanics and engineering. This is used to solve problems related to the equilibrium of a structure or system. It is based on the assumption that if a system is in equilibrium, the work done by all the forces during a virtual displacement is zero. This principle is applied by considering virtual displacements of the system and the corresponding work done by internal and external forces.
To apply the principle of virtual work,...
1.8K

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相关实验视频

Updated: Mar 14, 2026

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation

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在真实和虚拟环境中的反向歇斯底里效应.

Christoph Schütz1,2

  • 1Faculty of Psychology and Sports Science, Bielefeld University, Bielefeld, Germany.

Frontiers in sports and active living
|March 13, 2026
PubMed
概括

运动歇斯底里症,即重新使用以前的运动计划,首次在全身运动中观察到. 这项研究探讨了现实和虚拟现实环境中的运动规划效率,在VR中发现了类似的模式,但谨慎的行为.

科学领域:

  • 生物力学和运动控制
  • 人与计算机的交互
  • 虚拟现实应用 虚拟现实应用

背景情况:

  • 重复的运动任务通常涉及重复使用以前的运动计划以尽量减少认知负载,这种现象被称为运动歇斯底里症.
  • 虽然运动歇斯底里症在伸展运动中被记录在案,但其在离散全身运动中的存在在很大程度上仍未被探索.
  • 在全身任务中研究运动歇斯底里可以揭示运动规划和降低成本的一般原则.

研究的目的:

  • 为了确定运动歇斯底里症是否表现在离散的全身姿势选择任务中.
  • 为了比较真实世界与虚拟现实 (VR) 环境中的全身运动研究的效率和行为模式.
  • 探索观察到的运动歇斯底里斯对运动规划的影响,特别是关于重复抑制.

主要方法:

  • 参与者执行了一项全身姿势选择任务,通过不同宽度的光圈导航,宽度序列旨在诱导歇斯底里.
  • 测量身体旋转以量化运动调整.
  • 该任务在虚拟现实 (VR) 环境中复制,与一组独立的参与者一起评估VR可行性.

主要成果:

  • 观察到一个反向的歇斯底里效应:参与者启动的身体旋转低于一个关键的光圈宽度,它根据序列顺序转移.
  • 这种反向歇斯底里模式在VR环境中被复制,证实了可比的行为动态.
关键词:
全身运动是全身运动.这是歇斯底里症.汽车规划 汽车规划选择姿势选择姿势选择现实环境 现实环境虚拟环境 虚拟环境是一个虚拟环境.视觉反 视觉反是指视觉上的反.

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  • 虚拟现实参与者表现出更谨慎的行为,与现实世界中的同行相比,在更大的光圈中旋转.

    • 结论:

    • 运动歇斯底里症,特别是逆效应,存在于离散的全身运动中,这表明它适用于超越完成任务的运动规划.
    • 虚拟现实是研究全身运动的可行环境,尽管由于行为差异,研究结果可能需要在现实环境中验证.
    • 这些发现表明,以前在感知中注意到的重复抑制也可能在运动规划中发挥作用,特别是在高机械成本的情况下.