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相关概念视频

PD Controller: Design01:26

PD Controller: Design

184
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
184
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

83
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
83
PI Controller: Design01:24

PI Controller: Design

200
Proportional Integral (PI) controllers are a fundamental component in modern control systems, widely used to enhance performance and mitigate steady-state errors. They are particularly effective in applications such as automatic brightness adjustment on smartphones, where they excel at mitigating steady-state errors for step-function inputs. Unlike PD controllers, which require time-varying errors to function optimally, PI controllers leverage their integral component to address residual...
200
Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

282
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
282

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相关实验视频

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Force and Position Control in Humans - The Role of Augmented Feedback
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有触觉反的直接假肢力量控制可能与内部模型连接.

Nabeel Hasan Chowdhury1,2, Susan Schramfield1,2, Patrick Pariseau1,2

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States.

medRxiv : the preprint server for health sciences
|December 23, 2024
PubMed
概括

外周神经刺激 (PNS) 为假肢控制提供触觉反,但运动纠正仍然具有挑战性. 这项研究探讨了肢体差异的个体在对象操纵任务中的PNS有效性,揭示了通过设备和刺激增强来改善控制的潜力.

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相关实验视频

Last Updated: Jun 4, 2025

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科学领域:

  • 神经科学是一个神经科学.
  • 生物医学工程 生物医学工程
  • 康复机器人 康复机器人

背景情况:

  • 动态握力调制涉及脑干和皮质控制,脑干机制对不完善的反具有坚固性.
  • 周围神经刺激 (PNS) 提供触觉反 (强度,位置),但不能完全复制自然触觉.
  • 皮质神经系统可以在感知前的水平上与运动系统集成,但它对运动纠正的有效性需要进一步研究.

研究的目的:

  • 调查PNS在对象操纵任务中促进运动纠正的有效性,对于一个有中半径上肢差异的个体.
  • 在不同的假肢控制条件下 (力与速度) 分析握力调节,肌肉活动和运动动力学,有和没有触觉刺激.

主要方法:

  • 一名肢体差异的参与者使用了一只装有袖口电极的假肢手用于PNS.
  • 任务涉及物体在障碍物上的运动,测量手的运动,握力和肌肉信号 (EMG).
  • 测试了四种条件:带/不带刺激的力控制和带/不带刺激的速度控制.

主要成果:

  • 直接力控制显示与举起但不降低物体的相关性,与完整的手不同.
  • 随着力量控制和刺激,假肢的滑落/掉落显著增加,这表明握力松动的问题.
  • 电磁图谱分析显示了预期的握力调节,刺激有助于意识到力值,特别是在较低的设置下.

结论:

  • 参与者的解码意图表明,试图减少握力,与完整的手行为保持一致,但假肢限制阻碍了输出.
  • 需要在假肢设计中进行改进,以便更精细地调整抓地力,并增强PNS来信号滑动力.
  • 刺激可能会提高位置意识和信心,但目前的系统需要改进才能进行有效的运动纠正.