变焦镜系统的闭环控制  

Closed loop control of a zoom lens system

作　　者：柏桂珍[1] 梅晓榕[1] 张华[1] 

机构地区：[1]哈尔滨工业大学控制科学与工程系,黑龙江哈尔滨150001

出　　处：《光电工程》2005年第1期20-22,30,共4页Opto-Electronic Engineering

摘　　要：针对变焦镜系统的机械装置的特点和技术要求,采用闭环控制方案。分别采用动态矩阵控制与线性控制两种方法设计控制器。在参数变化和外干扰都不太大的条件下两者性能相近,但采用线性补偿器的线性控制法简单、成熟,故总是优先选用。对象参数变化大和受到较大扰动时,两者性能不同:当时间常数增大一倍时,线性系统的最大超调由 8%变到 21%,动态矩阵控制法的最大超调由 6%变到 9%;在斜坡扰动作用下,线性系统的误差与时间成正比,而动态矩阵法的误差为 0.002。因此,在对象参数变化和扰动都比较大时,应当采用动态矩阵控制方法,它能使系统在动态性能和稳态误差两方面都具有良好的鲁棒性。In view of the features and technical demands of mechanical unit in a zoom lens system, a closed-loop control scheme is adopted. The controller is designed by using two methods, i.e. a Dynamic Matrix Control (DMC) algorithm and a linear cascade compensator. Under the conditions of both parameter variation and external disturbance not big, the performances of both methods are approximate, but the control method with linear compensator is always preferentially selected for its simplicity and maturity. The performances of these two methods are different when object parameter variation is big and a bigger disturbance is suffered: when time constant increases by one factor the maximum overshooting of the linear system varies from 8% to 21% and maximum overshooting of the dynamic matrix method varies from 6% to 9%. With the action of ramp disturbance, the error of the linear system is proportional to time and the error of the dynamic matrix method is 0.002. So when both object parameter variation and disturbance variations are big, the dynamic matrix method should be adopted. It can make the system have good robustness both in dynamic performance and homeostatic error.

关 键 词：变焦镜头 闭环控制 变焦控制 动态矩阵控制 

分 类 号：TB851[一般工业技术—摄影技术]