Influence Factors of Inherent Characteristics of F5 Cold-Rolling Mill’s Main Drive System

Table 5

The natural frequency of the main drive system of the rolling mill under various conditions.

Natural frequency	Down state	Stop states considering strip influences	Motor open-loop control to simulate rolling	Motor single closed-loop control to simulate rolling	Motor double closed-loop control to simulate rolling	Rolling state
First order	0	0.4	0.3	17.1	0.14	0.46
Second order	26.9	27	29.5	27.6	26.5	26.6
Third order	35.2	35.1	35.2	29.8	34	33.8
Fourth order	62.7	62.7	64.5	62	62.3	62.3
Fifth order	96.2	96.2	96.3	95.8	95.7	95.7