Agarwal G C, Goodarzi S M, O'Neill W D, Gottlieb G L
Biol Cybern. 1984;51(2):103-11. doi: 10.1007/BF00357923.
The dynamic response of the human ankle joint to a bandlimited random torque perturbation superimposed on a constant bias torque is observed in normal human subjects. The applied torque input, the joint angular rotation output, and the electromyographic activity using surface electrodes from the extensor and the flexor muscles of the ankle joint were recorded. Transfer function models using time series techniques were developed for the torque - angular rotation input-output pair and for the angular rotation - electromyographic activity input-output pair. A parameter constraining technique was applied to develop more reliable models. It is shown that the asymptotic behavior of the system must be taken into account during parameter optimization to develop better predictive models.
在正常人体受试者中观察了人类踝关节对叠加在恒定偏置扭矩上的带限随机扭矩扰动的动态响应。记录了施加的扭矩输入、关节角旋转输出以及使用来自踝关节伸肌和屈肌的表面电极的肌电活动。使用时间序列技术为扭矩-角旋转输入-输出对以及角旋转-肌电活动输入-输出对开发了传递函数模型。应用了参数约束技术来开发更可靠的模型。结果表明，在参数优化过程中必须考虑系统的渐近行为，以开发更好的预测模型。
