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Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

484
Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
484

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PACT:一种以实践为导向的预测算法,用于定制的跨辐射假肢插座设计.

Vishal Pendse1,2, Calvin C Ngan2, Elaine Ouellette2

  • 1Institute of Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada.

PloS one
|January 8, 2026
PubMed
概括
此摘要是机器生成的。

定制跨辐射插座设计预测算法 (PACT) 从3D肢体扫描快速创建假体插座. 这种自动化方法为传统方法提供了可行的替代方案,提高了假肢护理的效率.

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科学领域:

  • 生物医学工程 生物医学工程
  • 假肢和整形手术
  • 计算机辅助设计 计算机辅助设计

背景情况:

  • 缺少用于上肢假肢的标准化数字插座设计,需要大量的临床医生时间.
  • 目前用于假肢插座设计的方法并未完全优化,以提高效率和患者特定的适应性.

研究的目的:

  • 引入和验证定制跨辐射插座设计 (PACT) 预测算法,用于生成跨辐射假肢插座.
  • 为了评估PACT的准确性和效率,与传统的假肢师设计的插座相比.

主要方法:

  • 在3D肢体扫描中,PACT利用参考库和缩放调整 (同otropic 和 anisotropic) 来生成插座模型.
  • 验证涉及将PACT生成的插座与假肢师设计的插座 (黄金标准) 进行比较,使用19名参与者的表面距离,体积差异和横截面积分析.
  • 通过符号距离色化和DBSCAN集群,确定了局部差异.

主要成果:

  • 与假肢设计相比,PACT产生的插座的平均表面差异为2.11 ± 0.51毫米,体积差异为2.74 ± 2.56%.
  • 切片的面积差异大多在±10%以内,在插座的近端和远端附近有较大的偏差.
  • 常见的差异包括前远线和前后压缩,观察到与年龄相关的尺寸偏差.

结论:

  • 在临床适应容忍范围内,PACT能够快速生成初稿的透射插座 (平均时间:13.2±0.7秒).
  • 识别的差异为未来的算法改进提供了目标,包括组织硬和年龄等因素.
  • 通过整合区域数据和临床医生测量,可以实现进一步的个性化和通用性.