Abstract
Large NC machine tools or NC machine tools with elastic parts such as reducers tend to have mechanical low frequency vibration. With high gain servo control, low frequency vibration appears as machining point vibration, and results in deterioration of machining surface. In this article, two anti-vibration control methods to suppress machining point vibration are proposed based on two-mass model; one is for semi-closed control and the other is for full-closed control. The basic idea of the proposed control laws is to regard the position reference from NC not as for motor but as for load of two-mass system. Experiments were done and it is shown that both proposed laws effectively suppress the load angular error by allowing motor angular error.
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