Abstract: This paper deals with the influence of the continuously varying width of cut during machine-tool dynamic testing on the stability of machine-tool chattering. Owing to the fact that the width of cut varies continuously during test, a new feedback factor which may exert influence on the stability of machine-tool chattering should be taken in to consideration .The stability condition of machine-tool chattering is not only related to the real component of effective dynamic compliance of machine-tool structure, but also to the corresponding imaginary part as well as the frequency of chatter. Therefore traditional theory for the assessment of dynamic performance of machine-tool is lack of truth. According to the presented theory, the stability condition of machine-tool chattering depends on the influences of technological cutting parameters, material and shape of work piece as well as the dynamic parameters of particular machine-tool structure.

Key words: 传递函数, 动态性能, 机床, 绝对稳定性条件, 时变切宽