Dynamic Behavior Analysis of Touchdown Process in Active Magnetic Bearing System Based on a Machine Learning Method

Table 1

Summation of touchdown experiments.

Number of experiments	Touchdown speed (rpm)	Brake?	Additional axial load?	Auxiliary bearing type
1	5000	No	No	Ceramic ball
2	5000	No	No	Ceramic ball
3	5000	No	No	Ceramic ball
4	5000	No	No	Ceramic ball
5	5000	No	No	Ceramic ball
6	5000	Yes	No	Ceramic ball
7	5000	Yes	No	Ceramic ball
8	5000	Yes	Yes	Ceramic ball
9	5000	Yes	Yes	Ceramic ball
10	5000	Yes	Yes	Ceramic ball
11	5000	Yes	Yes	Ceramic ball
12	5000	Yes	Yes	Ceramic ball
13	5000	Yes	No	Ceramic ball
14	5000	Yes	No	Ceramic ball
15	5000	Yes	Yes	Ceramic ball
16	5000	Yes	Yes	Ceramic ball
17	5000	Yes	Yes	Ceramic ball
18	5000	Yes	Yes	Ceramic ball
19	5000	Yes	Yes	Ceramic ball
20	5000	Yes	Yes	Ceramic ball
21	5000	No	No	Steel ball