Abstract

'''High-frequency vibration can result in failure of the working blades. So suppressing vibration failure of blades becomes more and more important. Damping performance of viscoelastic block on blades is researched based on principle of finite element method, contact theory of elastic body and the solving equations of natural frequency. Modal and harmonic response is analyzed to obtain natural frequency, vibration displacement and stress, in which different finite element models of blade are established. Effects of different adding position and thickness of viscoelastic block on damping performance are analyzed. Elastic modulus and loss factor of viscoelastic material is also changed to study their influence on damping performance. The results show that viscoelastic block applied to blades has excellent performance in reducing blade vibration. When viscoelastic block is added to mortise side, the damping performance of blade is the best. In addition, thickness of viscoelastic block and parameters of viscoelastic material have a significant effect on vibration reduction of blade. '''Key words''': Viscoelastic damping material, blades, vibration reduction, modal analysis, harmonic response Corresponding author. E-mail: [mailto:fswang@nwpu.edu.cn fswang@nwpu.edu.cn] (Fusheng Wang)

Abstract

This paper presents a survey of the numerical simulation of base isolation systems for the vibration control of
buildings and their equipment, primarilly against earthquakes. Base isolation has received much attention in
the recent twenty years and many buildings have been protected using this technology. The article focusses
mainly on the different numerical methods used in the analysis of base isolated buildings. The conventional
form of solving the equations of motion governing the seismic response of building structures with nonlinear
base isolation consists of using monolithic step by step integration methods. As an effcient alternative, static
condensation and block iterative schemes can be applied. The particularities of the equations of motion
of buildings equiped with various base isolation systems are described. The linear theory of base isolated
buildings is then presented. After this, numerical solution techniques for the analysis of the seismic response
of buildings with isolation systems are developed in detail in the paper. Finally, numerical results for elastic
and inelastic structures are described. A complete set of references coverning a wide range of studies is
included.

Abstract