ΞΆ_i=Ξ±β(2Ο_i )+(Ξ²Ο_i)β2+ΞΆ+ΞΆ_mi

ΞΆ_i : integrated damping ratio

Ξ±β(2Ο_i ) : relates to the component structure and mass matrix

(Ξ²Ο_i)β2 : represents mode internal friction which is derived from material stiffness matrix

ΞΆ : material damping ratio which is derived from the material loss angle

ΞΆ_mi : the individual modal damping that can be prescribed for each mode separately

Β

Ξ²=2ΞΆ/Ο_iΒ Β Β Β Ξ±=2ΞΆΟ_iΒ Β Β Β ΞΆ=?/2,Β ? : loss angle

Β