Experimental investigation of noise re-radiation of lightweight floating floors

Gym floors can be excited by different activities such as falling weights (dumbbells, Olympic weight lifting, medicine balls....), treadmills and jumping. Different standard indicators and tests are available to determine the efficiency of floating floors for noise and vibration transmission such as Ln,w and Rw or STC/IIC. Despite of e cient isolation performances of floating floors in gyms to control the noise and vibration transmission towards the rooms below, the people living in apartments above the gym are often complaining about noise generated by gym activities. The present work aims to investigate the noise re-radiation due to vibrations of the gym floating floors. To determine the level of noise re-radiation, the radiation coe cient and normalized sound power are measured for different setups of lightweight CDM-GYM floors. The floors were structurally excited by means of a shaker, and the response of the floors were measured by means of a Laser Doppler Vibrometer (LDV). The effects of structural modifications in floors on the radiation coeficient and normalized sound power are discussed.