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相关概念视频

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
389
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

448
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
448
Rotational Motion about a Fixed Axis01:26

Rotational Motion about a Fixed Axis

432
A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
432
Two-Dimensional Force System01:20

Two-Dimensional Force System

872
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:
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Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

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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...
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Two-Dimensional Force System: Problem Solving01:29

Two-Dimensional Force System: Problem Solving

540
Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...
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Visualization Method for Proprioceptive Drift on a 2D Plane Using Support Vector Machine
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基于优化的二维对称抛动运动预测和验证.

Seunghun Lee1, James Yang1

  • 1Department of Mechanical Engineering, Human-Centric Design Research Lab, Texas Tech University, Lubbock, TX, USA.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
|December 6, 2024
PubMed
概括
此摘要是机器生成的。

这项研究开发了一种新的方法,可以在没有先前数据的情况下预测人类的抛动动作,从而优化安全性并减少重复性任务中的受伤风险. 预测与实验数据保持一致,验证了实际应用的方法.

关键词:
手动物料处理手动物料处理数字人体模型数字人体模型伤害风险 伤害风险 伤害风险基于优化的运动预测.抛运动是抛运动.

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科学领域:

  • 生物力学 生物力学
  • 人类运动分析分析
  • 机器人技术 机器人技术 机器人技术

背景情况:

  • 人类运动分析对于表现和康复至关重要.
  • 预测人体运动,特别是用于预防重复任务中的伤害,如抛,由于缺乏预先的实验数据,因此具有挑战性.
  • 抛任务可能会导致严重的身体疲劳和潜在的伤害.

研究的目的:

  • 介绍一种基于优化的方法,用于预测2D对称的人类抛动运动.
  • 开发一个不依赖于事先收集的实验数据的模型.
  • 根据实验数据验证预测模型并评估其实际适用性.

主要方法:

  • 利用顺序二次编程来优化动态努力.
  • 将静态和动态联合扭矩限制纳入优化中.
  • 收集了来自10名受试者的实验数据,使用运动捕捉和强力板进行验证.

主要成果:

  • 预测的最佳抛动动作符合动力学数据的实验标准偏差.
  • 预测的地面反应力处于实验数据范围之内.
  • 在动态和静态强度约束之间分析了预测的联合扭矩的差异.

结论:

  • 提出的基于优化的方法准确地预测了2D对称的抛动运动.
  • 该模型的预测被实验数据验证,证明了它的有效性.
  • 这些发现对在涉及重复动任务的职业环境中预防伤害有实际意义.