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相关概念视频

Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

632
The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
632
Cable: Problem Solving01:29

Cable: Problem Solving

312
When dealing with a cable that is fixed to two supports and subjected to uniform loading, it is crucial to determine the maximum tension in the cable. This process can be broken down into several key steps, as outlined below:
312
Cable Subjected to Its Own Weight01:13

Cable Subjected to Its Own Weight

423
Overhead power transmission lines rely on cables to carry electricity across large distances. To ensure the stability and functionality of these lines, it is crucial to understand the shape and tension experienced by the cables under the influence of their weight.
A generalized loading function is employed to analyze a cable subjected to its own weight. This function considers the force acting along the cable's arc length rather than its projected length, providing a more accurate...
423
Cable Subjected to Concentrated Loads01:28

Cable Subjected to Concentrated Loads

793
Flexible cables are commonly used in various applications for support and load transmission. Consider a cable fixed at two points and subjected to multiple vertically concentrated loads. Determine the shape of the cable and the tension in each portion of the cable, given the horizontal distances between the loads and supports.
793
Tension01:10

Tension

12.0K
Tension is a force along the length of a medium, in particular, a force carried by a flexible medium, such as a rope or cable. The word "tension" comes from Latin, meaning "to stretch". Not coincidentally, the flexible cords that carry muscle forces to other parts of the body are called tendons. Any flexible connector, such as a string, rope, chain, wire, or cable, can exert pull only parallel to its length; so, a force carried by a flexible connector is a tension with a...
12.0K
Torque Free Motion01:15

Torque Free Motion

453
The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
453

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Updated: Jun 2, 2025

Method to Measure Tone of Axial and Proximal Muscle
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无传感器的基于模型的紧张控制,用于电缆驱动的外套.

Elena Bardi1,2, Adrian Esser3, Peter Wolf3

  • 1WeCobot Lab, Polo territoriale di Lecco, Politecnico di Milano, Milano, Italy.

Wearable technologies
|January 15, 2025
PubMed
概括
此摘要是机器生成的。

这项研究开发了一个无力传感器的电缆驱动的外衣,简化了设计并降低了成本. 无传感器的方法有效地控制了辅助扭矩,减少了手臂运动期间的肌肉努力.

关键词:
控制 控制 控制 控制 控制在外衣上穿出了外套.人与机器人的交互康复机器人技术的康复软可穿戴机器人软可穿戴机器人

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科学领域:

  • 机器人技术 机器人技术 机器人技术
  • 生物力学 生物力学
  • 康复工程 康复工程 康复工程

背景情况:

  • 电缆驱动的外衣提供了运动残疾人支持的潜力.
  • 目前的设计往往包含昂贵和复杂的力传感器来测量张力.

研究的目的:

  • 为上肢电缆驱动的外套提供一种新的设计和控制策略,消除了对力传感器的需求.
  • 在辅助扭矩控制,运动质量和肌肉努力方面评估无传感器外套的可行性和有效性.

主要方法:

  • 开发了一种机械透明的外套设计.
  • 利用基于模型的张力控制器的数据驱动摩擦识别.
  • 对17名健康参与者进行了系统评估,他们进行了手臂运动,收集了动力学,肌电学和主观数据.

主要成果:

  • 在50%的重力支下追踪所需的辅助扭矩时,实现了0.71 Nm (18%) 的根平均平方误差.
  • 在举起手臂时,表现出前腹骨 (30%),梯形骨 (38%) 和大胸骨 (38%) 的电肌图信号显著减少.
  • 在降低过程中观察到后部体活动增加 (32%),位置跟踪没有显著变化,但运动流性下降.

结论:

  • 移除力传感器对于有线驱动的外衣是可行的和有效的.
  • 无传感器方法简化了外衣设计并降低了成本,为更容易获得的辅助设备铺平了道路.
  • 需要进一步改进外套的工程学,以减轻用户的不适.