当液压伺服系统用于机械传动的校正机构时，显得调整时间长，超调量大，校正精度不高。
When used in correction mechanism of mechanical drive, hydraulic servo system manifests a long time of overshoot, large overshoot and poor correction accuracy.
但是，由于GMM存在非线性、磁滞回等特性，普通的PID控制会出现超调量大、调节时间长等问题。
Nonlinearity is also the instinct characteristic of GMM, which will cause overshot and long settling time in normal PID control.
针对上顶栓压力常规PID控制存在响应慢、超调量大、抗干扰能力不强的问题，进行上顶栓压力的智能控制研究。
The intelligent control for ram piston pressure was researched to solve the problems of slow response speed, big overshoot and bad robustness of general PID control.
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