摘要
常规Smith预估器是基于时滞对象精确数学模型,在实际应用中,当被控系统的参数不稳定或受到干扰时,会造成Smith预估模型的失控,使得控制效果变差甚至振荡。本文采用改进型Smith预估控制克服系统较大的滞后性,将该算法应用于LFW250型线性摩擦焊机的液压伺服振动系统控制。仿真结果表明,在被控对象模型失配的情况下,改进型Smith预估补偿具有较好的鲁棒性。
As traditional Smith predictor is based on precise time-delay system model,when system parameters are unstable or disturbed.The Smith predictor model and system model will not match,this will lead to bad control effect or even make system oscillatory.The application of an improved Smith predictor in hydraulic servo vibration control of LFW250 linear friction welding machine has been simulated and thus is proposed.The simulation results show that this modified control scheme provides better robustness for model uncertainties whether the parameter of control model is increased or reduced.
出处
《航空精密制造技术》
2013年第3期16-18,共3页
Aviation Precision Manufacturing Technology
关键词
线性摩擦焊机
SMITH
预估
纯滞后
液压伺服振动控制
linear friction welding machine
Smith predictor
time delay
hydraulic servo vibration control
