High frequency mold oscillation technology was developed to improve the surface quality of continuos casting steel products and a non-sinusoidal oscillation control electrohydraulic system is designed to call for meeting stringent for gain and phases over a wide frequency band. A non-linear model of the system is presented which includes most of known safuration and coulomb friction encountered in the operation of the system. The effects of saturation and friction on sysem performance are discusses and approaches that can be adopted to reduce the effect friction on system performance are outlined. The practice shows that the needs for increasing drawing speed and decreasing the oscillation mark in the production can be meted as long as to take reasonable control strategy.
展开▼
