Abstract: Theoretical research is conducted on dynamic analysis of vibration suppression of the blade with viscoelastic damping block.Using complex modulus model to represent the constitutive law of viscoelastic material,the blade is simplified to single degree of freedom model,to achieve natural frequencies and harmonic response in the frequency domain.The analytical dynamic model of the blade with a viscoelastic damping block at the root of the blade is established.Viscoelastic damping block in the form of the massless complex stiffness spring is introduced into the system.Subsequently,based on the single degree of freedom model,complex eigenvalue method is adopted to analyze the contributions of natural frequency,loss factor and response on the resonant frequencies and response level.Finally,analytical and test results are compared and mutually confirmed,showing that all the viscoelastic damping served an good role in vibration suppression.

Key words: blade, single degree of freedom model, viscoelastic damping block, vibration suppression, natural frequency, resonant response