Abstract: In order to improve the simulation accuracy of viscoelastic constrained damping structure model， a modeling method of constrained damping structure considering frequency-dependent characteristics was proposed and then a test was performed for verification. Firstly， the dynamic test of ZN-3 viscoelastic material was carried out， and the expressions of modulus and loss factor of viscoelastic material were obtained using the least squares method. Secondly， according to the expression of loss factor of ZN-3 viscoelastic material， the natural frequency and modal loss factor of constrained damping structure were solved using the modified modal strain energy method considering frequency-dependent characteristics. Finally， the cantilever constrained damping structure attaching the viscoelastic damping material was chosen and verified from both theory and test， whose results showed that the finite element model considering frequency-dependent characteristics has higher accuracy and the error of model to test is within 5%， which verifies the accuracy of the modeling method.

Key words: viscoelastic material; frequency-dependent characteristics; constrained damping structure; least squares method; finite element model