切削力与振动位移的相位测量是开展滞后型颤振诊断工作的关键。本文利用互谱密度函数所包含的相位讯息来测量两颤振信号在主振频率成份上的相位差，并在实验方法上解决了在切削过程中测量切削力信号相对于加速度信号在主振频率成份上相位测量的技术难题。 Cutting force and vibration displacement phase measurement is the key to carry out the diagnosis of hysteretic flutter. In this paper, the phase information contained in the cross-spectral density function is used to measure the phase difference of the two flutter signals in the main frequency components. In the experimental method, the phase difference between the cutting force signal and the acceleration signal at the main vibration frequency Technical problems of phase measurement on ingredients.