A FUNDAMENTAL STUDY ON PREDICTION USING SDOF MODEL OF HEAVY-WEIGHT FLOOR IMPACT SOUND LEVEL REDUCTION WITH THE RUBBER BALL FOR DRY FLOATING FLOOR STRUCTURE

Abstract

We attempted to construct a practical method using SDOF model for predicting the reduction in heavy-weight floor impact sound level with the rubber ball for dry floating floor structure. The prediction formula we proposed can calculate the reduction based on the physical property values, and consists of the following three items.

・　Increasing impedance level of slab.

・　Vibration damping in the floorboard of dry floating floor.

・　Vibration reduction effect when vibration are transmitted from dry floating floor to the slab.

The predicted and measured values showed good correspondence at 63 to 500 Hz band, and high correlation (R=0.90).