Application of multiple dynamic vibration absorbers in reducing low-frequency vibration of a floor-like lightweight joist structure: Comparison of experimental and computational results

Typical solutions to reduce excessive floor vibration and radiated sound to the room below include increasing floor mass, stiffening floor structure, and adding a floating floor in the source room. However, these methods may not be effective for lightweight floors at low frequencies. The use of dynamic vibration absorbers (DVAs) to reduce low-frequency structural vibration has attracted the attention of researchers in recent years. In this paper, an analytical model is proposed to study the effect of DVAs on the vibration of a lightweight joist structure by combining the bending modes of the plate with the bending and torsional modes of the beams. The analytical model is compared with the results from finite element models and measurements on a scaled wooden joist floor structure with fabricated spring-mass-type DVAs. A good consistency between the analytical results with results from the latter two are found in terms of the structural vibration and the DVAs' effects.