预测地面反应力和压力中心的动力学数据从基于LSTM的拐杖步行中的动力学数据
Xinyu Guan1, Hanyu Chen2, Yali Liu3
1School of Engineering Medicine, Beihang University, 100191 Beijing, China.
Medical engineering & physics
|April 30, 2025
概括
这项研究使用移动捕捉数据预测了使用拐杖辅助行走期间的地面反应力 (GRF). 长期短期记忆网络 (LSTM) 模型表现出高精度,为康复评估提供了具有成本效益的解决方案.
科学领域:
- 生物力学 生物力学
- 康复工程 康复工程 康复工程
- 计算神经科学是一种神经科学.
背景情况:
- 分析地面反应力 (GRF) 对于评估使用拐杖的患者的行走功能恢复至关重要.
- 目前使用力平台的方法昂贵,需要专门的设备,限制了广泛的临床应用.
- 开发GRF的预测模型可以显著降低成本,提高步态分析的可访问性.
研究的目的:
- 提出和评估一种新的方法,用于预测在拐杖辅助行走过程中地面和脚的GRF.
- 为了比较不同人工神经网络 (ANN) 的预测性能,包括多层感知器 (MLP),卷积神经网络 (CNN) 和长短期记忆 (LSTM).
- 评估使用运动捕捉的动力学数据用于康复中GRF预测的可行性.
主要方法:
- 从使用拐杖行走的个体收集同步的力和运动数据.
- 使用OpenSim开发了一种肌肉骨模型,以计算关节的角度和时刻.
- 经过培训和验证的MLP,CNN和LSTM模型,使用Leave-One-Subject-Out (LOSO) 交叉验证策略.
主要成果:
- LSTM模型显示出最高的预测准确度,特别是在左脚GRF的垂直组成部分 (r=0.961±0.050,nRMSE=13.8%).
- 在预测垂直GRF的准确性和稳定性方面,LSTM的表现优于CNN和MLP.
- 平均而言,在不同方向上,LSTM模型实现了0.656±0.362的r值和GRF预测的nRMSE30.3%.
- 预测的GRF通过计算关节时刻进一步验证,证实了LSTM模型的有效性.
结论:
- 在 LSTM 模型显示显著的承诺,准确预测地面反应力在拐杖辅助步行.
- 这种基于动力学的预测方法为传统的力平台测量提供了潜在的成本效益和可访问的替代方案.
- 这些发现支持深度学习技术的应用,特别是LSTM,用于用于康复目的的定量步态分析.
更多相关视频
相关概念视频
Distributed Loads
Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
For example, consider a bookshelf filled with books stacked vertically adjacent to each other. The weight of the books is evenly distributed over the length of the shelf. As a result, the pressure at different locations on the surface of the...
For example, consider a bookshelf filled with books stacked vertically adjacent to each other. The weight of the books is evenly distributed over the length of the shelf. As a result, the pressure at different locations on the surface of the...
Rolling Resistance
When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
For instance, imagine a hard cylinder rolling on a comparatively soft surface. The cylinder's weight compresses the surface beneath it. As the cylinder moves, the material in front of it slows down due to...
Resultant of a General Distributed Loading
While designing structures exposed to non-uniform loads, it is crucial to consider the resultant force and its location. This resultant force is a single vector representing the net force applied due to the distributed load.
Examples such as load distribution due to wind and load distribution on a bridge illustrate how this concept is used to analyze and design safe, reliable structures under variable loading conditions. Most structures, such as residential buildings, bridges, and towers, are...
Examples such as load distribution due to wind and load distribution on a bridge illustrate how this concept is used to analyze and design safe, reliable structures under variable loading conditions. Most structures, such as residential buildings, bridges, and towers, are...
Elasticity in Concrete
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear portion of...
Dynamic Modulus of Elasticity of Concrete
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by a...
Application of Linearization and Approximation
A drone flying through complex terrain often relies on more than one sensing method to estimate small changes in altitude. Along with direct measurements, air pressure provides a useful indirect indicator of vertical movement. Atmospheric pressure decreases as altitude increases, and this relationship is commonly described using an exponential model. Although accurate, converting pressure measurements into altitude values requires calculations that are too complex to perform repeatedly during...


