Enderle J D, Engelken E J, Stiles R N
Division of Bioengineering Electrical & Electronics Engineering North Dakota State University, Fargo 58105.
Biomed Sci Instrum. 1990;26:59-65.
A new oculomotor plant is presented in this study using an updated third-order linear muscle model. The lateral and medial rectus muscle is modeled as a viscoelastic parallel combination connected to a parallel combination of active state tension generator, viscosity element and length tension elastic element. The eyeball is modeled as a sphere, connected to two parallel viscoelastic elements, connected in series. Each of the elements is linear. The static and dynamic properties of the muscle model are in good agreement with rectus muscle data. The length-tension characteristics of the model match the data within the operating region of the muscle. Simulation results for the muscle model yield hyperbolic shaped force-velocity curves that match the data very well. All parameters and initial conditions are estimated or directly measured from physiological data. The oculomotor plant is derived through direct programming state-space representation by Laplace variable analysis about the operating point or initial eye position. The form of the oculomotor plant makes this representation even more ideal than previous models for use in the development of more sensitive tests of oculomotor pathology and in the description of normal oculomotor function.
本研究采用更新的三阶线性肌肉模型提出了一种新的眼球运动装置。外直肌和内直肌被建模为一个粘弹性并联组合，连接到一个由主动态张力发生器、粘性元件和长度-张力弹性元件组成的并联组合。眼球被建模为一个球体，连接到两个串联的并联粘弹性元件。每个元件都是线性的。肌肉模型的静态和动态特性与直肌数据吻合良好。模型的长度-张力特性在肌肉的工作区域内与数据匹配。肌肉模型的模拟结果产生了双曲线形的力-速度曲线，与数据非常吻合。所有参数和初始条件均根据生理数据进行估计或直接测量。通过对工作点或初始眼位进行拉普拉斯变量分析，通过直接编程状态空间表示法推导出眼球运动装置。眼球运动装置的形式使其比以前的模型更适合用于开发更敏感的眼球运动病理学测试以及描述正常的眼球运动功能。
