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In this paper, the phenomena of chatter vibration in a typicalplaning process is discussed from impulsive point of view. Considering theinstantaneous vibration as an impulse, we present the planing model as asecond-order impulsive dynamical system, which is a specic discontinuousone. Then we investigate its chatter conditions via the method of ow theoryin discontinuous systems, analyze ow's dynamical behaviors on separationsurface and get general results on chatter criterion. Finally, such dynamicalanalysis and criterion are applied to a specic planing model of coal plough.

CHATTER DYNAMIC ANALYSIS FOR A PLANING MODEL WITH THE EFFECT OF PULSE