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相关概念视频

Stability of structures01:14

Stability of structures

195
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Equivalent Couples01:28

Equivalent Couples

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In mechanical engineering, the concept of equivalent couples plays a crucial role in understanding and analyzing various mechanical systems.
Two couples are considered to be equivalent if they produce the same rotational effect on a rigid body. In other words, the two couples have the same magnitude and act in the same direction, causing the same angular displacement or acceleration in the body.
For instance, consider two couples lying in the plane of the page, with one having a pair of equal...
307
Mechanical Systems01:22

Mechanical Systems

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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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Three-Dimensional Force System01:30

Three-Dimensional Force System

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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Applications of Stress01:04

Applications of Stress

366
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
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Three Force Member01:27

Three Force Member

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A rigid body subjected to three forces acting at three points is known as a three-force member. These forces must have concurrent lines of action, except for parallel forces, where the lines of action are parallel.
For example, consider a dumpster connected to a pin support at point A and a pin attached to a hydraulic cylinder at point B.
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相关实验视频

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A Vibrotactile Feedback Device for Seated Balance Assessment and Training
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机械评价的统一升空悬挂系统的机械评估.

H Gholizadeh1, E D Lemaire1,2, R Salekrostam3

  • 1Ottawa Hospital Research Institute, Centre for Rehabilitation Research and Development, Ottawa, Canada.

Canadian prosthetics & orthotics journal
|August 24, 2023
PubMed
概括

与其他悬浮方法相比,Ossur Unity主动真空系统显著减少了假肢插座运动. 这种主动真空技术在测试过程中证明了对活塞的优越控制和更高的负载承受能力.

关键词:
截肢是一种截肢.升高真空可以提高真空.假肢 假肢是一种假肢.假肢肢是一种假肢.假肢悬浮系统是假肢悬浮系统.康复 康复 康复 康复社会人口统计学社会人口统计学

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科学领域:

  • 假肢和整形手术
  • 生物机械工程 生物机械工程
  • 材料科学 材料科学 材料科学

背景情况:

  • 剩余的肢体位位位移是假肢悬浮质量的关键指标.
  • 活动真空系统与非活动吸气系统相比,可以更好地控制垂直运动.
  • 这项研究研究了 Össur Unity 主动真空系统的机械性能.

研究的目的:

  • 通过使用 Össur Unity 主动真空系统机械评估四肢位位移.
  • 为了比较活性真空悬浮剂与非活性真空和无吸附条件的性能.
  • 评估不同假肢插座配置的承载能力和故障点.

主要方法:

  • 评估了48种条件,涉及各种插座材料 (聚烯,PETG,烯,Thermolyn),内类型 (标准,高档) 和真空状态 (活跃,不活跃,没有吸收).
  • 使用一台Instron 4428测试机器对假肢模具施加线性斜坡拉力负荷 (0-100N).
  • 记录了模具和插座之间的位移,并测量了故障前的负载 (位移10毫米).

主要成果:

  • 活性真空悬浮显示最小的平均位移 (0.30±0.16mm),优于非活性真空 (0.32±0.16mm) 和没有吸收 (0.39±0.22mm).
  • 活动真空系统在故障之前承受了显著更高的负载 (812±221N),而非活动真空 (727±213N) 和无吸气 (401±184N) 相比.
  • 在故障前的最高负载记录在一个圆柱状聚烯插座和高档内 (1142±53N) 上.

结论:

  • 统一的活性真空系统在正常活动期间有效控制了活塞,并承受了高引负载.
  • 所有测试的悬浮条件都在100N以下的负载下是可行的.
  • 插座制造材料对悬挂系统的整体性能没有显著影响.