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相关概念视频

Acceleration due to Gravity on Earth01:21

Acceleration due to Gravity on Earth

According to Newton's law of gravitation, the gravitational force on a body is proportional to its mass. According to Newton's second law of motion, the acceleration produced by an external force is inversely proportional to the force. Hence, the acceleration of an object under an external force of gravitation is independent of its mass.
The acceleration of an object close to the Earth, because of the Earth's gravitational pull, is called the acceleration due to gravity. It is always directed...
Variation in Acceleration due to Gravity near the Earth's Surface01:20

Variation in Acceleration due to Gravity near the Earth's Surface

An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
Two-Dimensional Force System01:20

Two-Dimensional Force System

A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
Measuring Acceleration Due to Gravity01:12

Measuring Acceleration Due to Gravity

Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
Acceleration due to Gravity on Earth00:55

Acceleration due to Gravity on Earth

Newton's second law is closely related to his first law of motion. It mathematically gives the cause-and-effect relationship between force and changes in motion. Newton's second law is quantitative and is used extensively to calculate what happens in situations involving a force. All external forces acting on a system add together to produce a net force Fnet. A larger net external force produces a larger acceleration. This acceleration is directly proportional to, and in the same direction as,...

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相关实验视频

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Simultaneous Scalp Electroencephalography EEG, Electromyography EMG, and Whole-body Segmental Inertial Recording for Multi-modal Neural Decoding
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在地面和虚拟无向跑步机上行走时的步态模式.

Morgan McGrath Lewis1,2, Colin Waltz3, Logan Scelina3

  • 1Department of Biomedical Engineering, Cleveland Clinic, Cleveland, OH, USA. mkm126@case.edu.

Journal of neuroengineering and rehabilitation
|February 22, 2024
PubMed
概括

在虚拟现实 (VR) 中,在全向跑步机 (ODT) 上行走类似于自然行走,但步伐较短,速度较慢. 一个扶手减少了在ODT上的步态变化.

关键词:
步行方式 步行方式动力学就是运动学.机车运动 机车运动一个无向的跑步机.虚拟现实虚拟现实就是虚拟现实.

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科学领域:

  • 生物力学 生物力学
  • 虚拟现实 虚拟现实 虚拟现实
  • 人类的机动运动

背景情况:

  • 全向跑步机 (ODT) 是虚拟现实 (VR) 运动挑战的潜在解决方案,旨在减少导致VR疾病的感官不匹配.
  • 透视运动对步态生物力学的影响在很大程度上仍未被探索.
  • 这项研究调查了健康成年人地上和ODT行走和转身之间的差异.

研究的目的:

  • 为了比较地上的行走和转过程中的步态生物力学与ODT上的行走和转.
  • 评估稳定扶手对ODT步态参数的影响.
  • 了解真实和虚拟环境之间人类运动的基本差异.

主要方法:

  • 15名健康的年轻人参与了这项研究.
  • 参与者在三个条件下进行了前行,180°和360°转:地面,没有扶手的ODT和带有扶手的ODT.
  • 三维光学运动捕捉被用来收集所有行走试验的动力学数据.

主要成果:

  • 与地面行走相比,ODT上的步行速度明显较慢.
  • 当步行速度受到控制时,ODT步行表现出更短的步骤长度和更大的步骤长度变化.
  • 打开ODT需要更多的步骤和更慢的旋转速度;扶手减少了ODT上的步态变化.

结论:

  • ODT步行紧密模仿自然步行模式,在较慢的速度和较短的步骤中存在显著差异,这可能是由于虚拟环境的新性.
  • 这些发现表明在ODT上导航虚拟空间时,更谨慎的步行策略.
  • 未来的研究应该探索在老年人和患有神经疾病的个体中使用ODT.