双谱分析在铣刀状态监测中的应用

针对铣刀渐进磨损过程中主轴端振动加速度信号的非平稳时变特点，提出了基于双谱分析的铣刀状态监测信号特征抽取方法，分析了铣刀在正常磨损、急剧磨损、崩刃和破损条件下，主轴端振动加速度信号的双谱特点，通过实验研究，在立式加工中心上验证了上述方法的有效生，研究表明双谱分析方法较其它方法更加适宜铣刀状态监测。

Application of Bispectrum Analysis to Helical Cutter Condition Monitoring

In milling process, the producing quality is affected by cutter wear condition. The condition can be monitored by spindle vibration accelerations. In accordance with the nonstationarity of the acceleration due to the progressive wear of the cutter, a method for extracting the cutter wearing feature by bispectrum analysis is presented. The characteristics of the bispectra of different wear stages, including initial wear stage, normal wear stage and rapid wear stage are analyzed. Experimental results show that the method is effective and more suitable for milling cutter condition monitoring than the others.