Vibration of pipes and cylindrical shells leading to noise and damage is an important engineering problem in plant systems and air conditioners, among others. To attenuate such vibration, a viscoelastic material is attached to pipes as a damping material. To predict the vibration reduction effect in detail, three-dimensional finite-element analysis is usually conducted considering the characteristics of the viscoelastic material, but such analysis requires considerable computation time. To overcome this problem, this study proposes added mass and added damping to address the effects of vibration of the damping material on the vibration of a pipe. By this method, one-dimensional analysis can be performed. To assess the validity of the proposed method, numerical results for the vibration of a pipe fitted with silicone obtained using the proposed method are compared with measurements from a hammering test and numerical results from three-dimensional analysis. The computational results obtained using the proposed method agree very well with the measurements and the three-dimensional numerical results. Furthermore, it is found that the vibration of the pipe is attenuated by not only the damping of the viscoelastic material but also the effect of dynamic behavior similar to that of a dynamic absorber.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Acoustics and Ultrasonics
- Mechanical Engineering