关键词: 半闭环, 劣化, 位置精度, 支持向量机, 模糊控制, 比例—积分—微分控制器

Abstract: The performance deterioration of semi-closed loop servo system was due to degradation of position precision and dynamic response characteristics. To deal with this problem, position precision compensation method based on fuzzy control was put forward. By taking small samples of position error data as data source, the support vector machine (SVM) was used to model and predict position error, and the predicted error was used to compensate system error. The fuzzy prportional integral derivative (PID) control was used to improve dynamic response characteristics. By modifying fuzzy control rules, the combination of fuzzy control and position error prediction compensation was realized so as to improve position precision and dynamic response characteristics.

Key words: semi-closed loop, deterioration, position precision, support vector machine, fuzzy control, prportional integral derivative controller