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[Yuying]

ζ_i=α⁄(2ω_i )+(βω_i)⁄2+ζ+ζ_mi

ζ_i : integrated damping ratio

α⁄(2ω_i ) : relates to the component structure and mass matrix

(βω_i)⁄2 : represents mode internal friction which is derived from material stiffness matrix

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

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

 

β=2ζ/ω_i      α=2ζω_i       ζ=?/2, ? : loss angle