Dynamic Characteristics of Blade with Viscoelastic Damping Block Based on Complex Eigenvalue Method

Table 7

Natural frequencies and modal damping ratios of the blade with different thickness of viscoelastic damping block.

Thickness/mm	First order		Second order		Third order
	Natural frequency/Hz	Modal damping ratio/%	Natural frequency/Hz	Modal damping ratio/%	Natural frequency/Hz	Modal damping ratio/%
1	249.15		996.78		1171.5
2	245.39		981.89		1156.2
3	241.75		967.58		1144.9
4	238.21		952.80		1138.6	1.63
5	234.78		941.00		1137.9	2.94
6	231.46		928.82		1143.1	4.66