Gym floors can be excited significantly due the falling weights like dumbbells or barbells. The manufacturer of the gym floor is normally well able to isolate the induced floor vibrations to the room below, thus protecting the people living or working below the gym from too high noise levels. However, people living above the gym are often complaining about noise that is generated in the gym due to the re-radiation of the gym floor, as the air-borne isolation of the ceiling of the gym can be insufficient in some cases. In this paper an experimental investigation is reported on the re-radiation of a number of floor variants. The floors are structurally excited by means of a shaker, and the responses of the floors were measured by means of a laser Doppler vibrometer. The effects of some structural modifications of the floor on the re-radiation of the floor are discussed.
