Application of Axis Orbit Image Optimization in Fault Diagnosis for Rotor System

Table 3

Hu invariant moments of the tested axis orbits.

Number	Hu invariant moments
	1	1.293	1.545	1.728	1.471	2.681	1.671	2.523
2	1.336	1.955	0.271	2.209	3.415	3.185	3.712
3	1.237	1.738	0.647	-0.853	-1.625	-0.198	-0.951
4	1.272	1.314	1.724	1.322	2.651	1.969	3.373
5	1.470	2.190	1.439	1.994	3.890	3.085	3.672
6	0.969	1.871	1.412	1.326	2.774	2.262	2.382
7	1.031	1.914	0.695	-0.836	-0.774	-0.105	-1.241
8	1.041	1.953	0.359	-0.936	-1.683	-0.238	-1.588
9	1.044	2.029	0.231	-0.722	-1.683	-0.094	-1.950
10	1.066	2.005	0.967	-0.073	-1.043	0.373	0.415
11	0.855	0.820	0.981	1.118	2.299	1.292	2.006
12	0.905	1.002	1.160	1.281	2.513	1.667	0.633
13	0.998	1.183	1.345	1.519	2.450	1.712	2.966
14	1.067	0.954	1.311	1.139	2.404	1.612	2.918
15	0.998	1.175	1.442	1.425	3.267	2.010	2.345
16	0.521	-0.089	-0.342	-0.913	-1.198	-0.958	-1.005
17	0.643	-0.837	0.486	-0.642	-0.228	-1.394	-1.182
18	0.649	0.128	-0.238	-0.859	-1.352	-0.817	-2.135
19	0.571	0.040	0.217	-0.861	-1.558	-1.379	-2.149
20	0.402	-0.426	-0.890	-1.462	-3.135	-1.817	-2.574