Many research works (e.g. [1],[2],[3]) have been reported on the phenomena and the mechanism of chipping of cutting tools so far, and also many on-line methods that detects tool wear and chipping have been reported. Most methods use a monitoring principle that detects the abnormality of cutting sign的翻译：什么意思？中文翻译英文，英文翻译中文，怎么说？

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很多研究工作(例如 [1]、[2]、[3])已经报告了这一现象,这一机制的碎裂的切割工具到目前为止,也有不少在线检测方法,已报告工具磨损和碎裂。大多数方法都使用一个监控原则,它可以检测到这种异常的切割信号,如切削力。这一原则的一个很大的问题是,监督设备行为发生后碎裂。