Abstract: This paper introduces the supervisory control system which realizes visual administration for silt model testing of Chongqing river reach.The composition of this system、basic function and control principle is proposed.And in this paper,it is also delivered that a principle and method of PWM position control for AC servo machinery.

Key words: silt model testing, supervisory control system, flow, water level, turbidity, grain analysis, PWM position contron, AC servo machinery

摘要： 介绍采用PC电脑实现可视管理的"重庆河段泥沙模型监控系统".论述了系统的主要结构、基本功能以及系统控制原理.并提出一种伺服电机PWM位控的原理和方法.

关键词: 泥沙模型, 可视化监控系统, 流量, 水位, 浊度, 颗粒分析, 数字控制原理, 伺服电机PWM位置控制