A DISCRETE-TIME MODEL OF ELECTRICALLY STIMULATED MUSCLE
A DISCRETE-TIME MODEL OF ELECTRICALLY STIMULATED MUSCLE
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DOI：
10.1109/tbme.1986.325776
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发表时间：
1986-09-01
影响因子：
4.6
通讯作者：
CHIZECK, HJ
中科院分区：
文献类型：
--
作者：
BERNOTAS, LA;CRAGO, PE;CHIZECK, HJ
描述电刺激等长肌肉的输入/输出特性的模型被开发和实验测试。一个离散时间模型给出了在脉冲宽度调制的招募在固定的刺激幅度和周期的刺激时间的力输出。模型中需要两个元素：一个静态的非线性元素，然后是一个线性的动态元素。静态非线性描述了脉冲宽度与稳态力之间的关系。用二阶离散时间确定性自回归移动平均（DARMA）模型描述了动态特性，误差小于10%。指数加权递归最小二乘方法允许有效的参数估计。模型参数随肌肉长度和刺激频率系统变化。对电刺激肌肉的实际反馈控制和模拟反馈控制的对比试验表明，该模型适合于功能性电刺激的数字控制器设计。
A model describing the input/output properties of electrically stimulated isometric muscle is developed and experimentally tested. A discrete-time model gives the force output at the times of stimulation during pulse width modulation of recruitment at fixed stimulus amplitudes and periods. Two elements are necessary in the model: a static nonlinear element followed by a linear dynamic element. The static nonlinearity describes the relationship between pulse width and steady-state force. The dynamic properties are described with less than 10 percent error by a second-order discrete-time deterministic autoregressive moving average (DARMA) model. Exponentially weighted recursive least squares methods allow efficient parameter estimation. Model parameters are found to vary systematically with muscle length and stimulus frequency. Tests comparing actual and simulated feedback control of electrically stimulated muscle indicate that the model is adequate for digital controller design for applications in functional electrical stimulation.