相关实验视频
Updated: Jun 30, 2025

10:41
Method to Measure Tone of Axial and Proximal Muscle
Published on: December 14, 2011
17.6K
带有两度自由度PID控制的系列弹性执行器改善了动力膝关节外骨架的扭矩控制
Sergei V Sarkisian1, Lukas Gabert1,2, Tommaso Lenzi1,2
1Department of Mechanical Engineering and the Utah Robotics Center at the University of Utah, Salt Lake City, UT, USA.
Wearable technologies
|March 21, 2024
概括
研究人员开发了一种用于动力外骨架的新型系列弹性执行器 (SEA),提高了扭矩控制和效率. 两度自由度 (2DOF) PID控制器提高了性能,减少了人类实验期间的错误和肌肉活动.
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
- 控制系统工程 控制系统工程
背景情况:
- 驱动式外骨需要轻量级,紧,高效的执行器,并提供精确的扭矩控制.
- 系列弹性执行器 (SEA) 在扭矩控制和效率方面具有优势,但可以增加重量和控制复杂性.
- 现有的SEA设计和控制策略对最佳动力外骨性能存在局限性.
研究的目的:
- 为了展示一种新的,高力密度的SEA设计,用于动力外骨架.
- 实施和评估两度自由度 (2DOF) PID控制系统,以增强输出阻抗和干扰排斥.
- 通过实验台和人体实验来评估新型SEA和2DOF PID控制器的性能改进.
主要方法:
- 设计和开发具有高力密度的新型SEA.
- 实施2DOF PID控制器,以改善执行器控制.
- 基板测试用于与1DOF PID控制器比较输出阻抗和声.
- 人体受试者实验 (N=3) 评估扭矩跟踪精度和肌肉活动 (EMG).
主要成果:
- 与1DOF PID控制器相比,2DOF PID控制器的基板测试表明输出阻抗和减压降低.
- 人类实验显示,使用2DOF PID控制器,用于扭矩跟踪,根-平均-平方误差减少了45.2%,峰值误差减少了49.8%.
- 电肌图 (EMG) 数据表明,当外骨处于辅助模式和透明模式时,肌肉峰值活动减少.
结论:
- 新的SEA设计和2DOF PID控制策略显著提高了动力外骨的性能.
- 该系统提供了改进的扭矩控制,效率和干扰排斥,从而减少了用户的努力.
- 这一进步解决了对下一代外骨更轻,更高效的执行器和先进控制的需求.
相关概念视频
PD Controller: Design
226
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,...
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
226
Time-Domain Interpretation of PD Control
107
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...
Consider the example of control of motor torque. Initially, a positive...
107
PID Controller
117
Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...
117
Torque Free Motion
480
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...
480
PI Controller: Design
264
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...
264
One-Degree-of-Freedom System
488
In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
488

