Fault Diagnosis of Piezoelectric Sensor Patches for Vibration Control Based on Multifeature Fusion and Improved SVM

Table 5

Signal energy characteristics of three kinds of piezoelectric patches.

Normalized eigenvectors
Normal	0.3461	0.3528	0.3508	0.3457	0.3607	0.3640	0.3523	0.3557
	0.3457	0.3523	0.3531	0.3452	0.3603	0.3630	0.3535	0.3550
	0.3458	0.3524	0.3533	0.3462	0.3604	0.3623	0.3527	0.3550
	0.3461	0.3530	0.3494	0.3455	0.3608	0.3633	0.3531	0.3567
	0.3459	0.3526	0.3516	0.3458	0.3605	0.3639	0.3523	0.3555
Broken	0.3465	0.3535	0.3482	0.3457	0.3613	0.3636	0.3528	0.3566
	0.3460	0.3529	0.3519	0.3455	0.3607	0.3627	0.3530	0.3553
	0.3461	0.3530	0.3491	0.3459	0.3609	0.3643	0.3522	0.3565
	0.3463	0.3534	0.3486	0.3457	0.3611	0.3631	0.3531	0.3566
	0.3463	0.3531	0.3491	0.3456	0.3610	0.3631	0.3534	0.3564
Degummed	0.3468	0.3534	0.3488	0.3457	0.3612	0.3637	0.3523	0.3561
	0.3468	0.3534	0.3488	0.3457	0.3612	0.3637	0.3523	0.3561
	0.3467	0.3534	0.3488	0.3457	0.3612	0.3637	0.3524	0.3561
	0.3467	0.3534	0.3488	0.3457	0.3612	0.3637	0.3523	0.3561
	0.3467	0.3534	0.3488	0.3457	0.3612	0.3637	0.3524	0.3561