125 / 2021-03-31 10:08:19

Vibro-Acoustic Characteristics Analysis of Building Structures Based on Hybrid Mode Synthesis Strategy

Component mode synthesis,fixed interface mode,free interface mode,acoustic-structure coupling,branch mode

The sound pressure level of a building structure is one of the most important indicators to evaluate the comfort of buildings, and it is also an important factor that directly affects the vibration characteristics and service life of the building. The research on the efficient numerical calculation method of the sound and vibration characteristics of the building structure has important engineering significance. In this paper, the building structure is considered as an acoustic-structure coupling system. The solid domain in this model is a general floor and wall slab structure, and the acoustic is a parallelepiped cavity. The solid structure is made of concrete material, and the internal cavity of the structure is filled with compressible air. Linear rubber damping is introduced on the connecting surface between the wall and floor. A hybrid mode synthesis strategy is used to establish a reduced model based on a multi-modal reduction method, employing the fixed interface mode of the substructures, branch mode of the interface and the free substructure mode of the acoustic cavity. Furthermore, around the common used damping methods of rubber damping in engineering, the influence of stiffness parameters on the connection surface of the substructure on the vibration characteristics of the system is studied. The proposed strategy can be directly applied to the evaluation of the dynamic characteristics of large and complex acoustic-structure coupling systems.