A balance control model of quiet upright stance based on an optimal control strategy.
A balance control model of quiet upright stance based on an optimal control strategy.
复制标题
基于最优控制策略的安静直立姿态平衡控制模型
DOI：
10.1016/j.jbiomech.2007.06.003
复制
发表时间：
2007
影响因子：
2.4
通讯作者：
Madigan,MichaelL
中科院分区：
文献类型：
--
作者：
Qu,Xingda;Nussbaum,MauryA;Madigan,MichaelL
平衡控制模型有助于理解人类维持平衡的机制。提出了一种基于最优控制策略的静立姿态平衡控制模型。在该模型中，人体以一个简单的单段倒立摆来表示直立姿态，并假设神经控制器是一个最优控制器，根据一定的性能准则产生踝关节控制力矩。这个性能标准是由几个与摇摆相关的物理量定义的。为了准确模拟现有实验数据，采用优化程序指定模型参数集，以最小化实验与模拟摆动测量之间的标量误差。对年轻人和老年人进行了32次独立模拟。基于仿真结果，分析了该模型在反映摇摆行为和识别老化效应方面的能力。该模型能够准确预测基于压力中心的摆动措施，并识别老化引起的平衡控制机制的潜在变化。还讨论了摇摆测量与模型参数之间的相关性。
Models of balance control can aid in understanding the mechanisms by which humans maintain balance. A balance control model of quiet upright stance based on an optimal control strategy is presented here. In this model, the human body was represented by a simple single-segment inverted pendulum during upright stance, and the neural controller was assumed to be an optimal controller that generates ankle control torques according to a certain performance criterion. This performance criterion was defined by several physical quantities relevant to sway. In order to accurately simulate existing experimental data, an optimization procedure was used to specify the set of model parameters to minimize the scalar error between experimental and simulated sway measures. Thirty-two independent simulations were performed for both younger and older adults. The model's capabilities, in terms of reflecting sway behaviors and identifying aging effects, were then analyzed based on the simulation results. The model was able to accurately predict center-of-pressure-based sway measures, and identify potential changes in balance control mechanisms caused by aging. Correlations between sway measures and model parameters are also discussed.