在应用直接法和摄动法进行灵敏度分析时，使振动方程与灵敏度方程具有相同的固有特性而产生长期项。
The natural characteristics are the same for vibration and sensitivity equations when direct method and perturbation method are used for sensitivity analysis.
同时，在大量工艺试验研究的基础上，得到了大量的工艺效果并研制出了各种振动切削装备，逐步使振动切削技术走向实用化。
A lot of excellent effects have been investigated, and multiform vibration cutting equipments have been developed, so that the practical vibration cutting technology has been applied gradually.
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