基于改进的变速刀尖频率响应函数法的计算研究

Calculation and Research Based on Improved Frequency Response Function Method of Speed-varying Tool-tip

颤振预测被认为是目前最具潜力的辨识方法,但预测方面具有一定的复杂参数限制性,因此介绍了一种有效的辨识方法—运行条件下的变速刀尖频率响应函数法(FRF)。所提出的方法是基于颤振极限(即颤振频率和相关切割深度)条件下的验证测试来实现的。依据实验结果和预测的颤振极限相比较,将其之间的差异最小化,最终用GA算法计算出速度变化的频率响应函数。此方法所得到的结果符合预期的线性趋势,证明了在预测无颤振切割参数方面是准确的。

Flutter prediction is considered as the most potential method of identification at present, but the prediction has some complicated parameter restrictions. Therefore, an effective identification method is introduced - the Frequency Response Function method （FRF） under operating conditions. The proposed method is based on verification tests under flutter limits （ i. e. , chatter frequency and related depth of cut）. Based on the experimental results and the predicted flutter limit, the difference between them is minimized. Finally, the GA algorithm is used to calculate the Frequency Rsponse Function of velocity variation. The results obtained by this method are in line with the expected linear trend and prove to be accurate in predicting chatter-free cutting parameters.