关键词: 动力学, 切削, 噪声, 振动

Abstract: According to the results of the cutting noise experiments, a new discovery is put forward. The discovery can be briefly stated as this: in the time domain, the cutting noise and the cutting vibration in the main cutting direction have very close relativity; in the frequency domain, they have very great similarity in frequency structure. Based on the new discovery, a concept about static cutting noise and dynamic cutting noise is presented. With this concept, the physical mechanism of the cutting noise can be explained and the relationship between the influence of the cutting vibration on the cutting noise and the influence of the dynamic behavior of a machine tool on the cutting noise can be studied. In this paper, the echoes are deleted from the cutting noise signals by means of cepstrum analysis. The purpose of deleting the echoes is to analysize the frequency structure of the pure cutting noise. With the help of 2-D ARMAY model the generating noise system in which the cutting vibration is taken as its main input and the cutting noise as its output can be identified. The identification states the transmission relationship of the generating noise system and the cutting vibration. It also gives a satisfactory explanation to the source and the transmission of the main frequencies of the pure cutting noise.

Key words: Cut, Dynamics, Noise, Vibration