Vibro-acoustic characterization of wood floors and influence of the constructive principle

This work aims to study the vibro-acoustic behavior of wood floors. The ultimate goal is to be able to better take into account the low frequencies (20 Hz-100 Hz) in the acoustic global indices used in building acoustics and thus, to better adapt them to light wood constructions sensitive to this range of frequencies. By modifying the arrangement of wooden joists, two constructive principles were considered in order to observe the effect of rigidity. The natural frequencies and the modal deformations of these wood floors were then estimated from the frequency response functions resulting from hammer impact measurements. A finite element modeling of these floors was then carried out by having previously estimated the input parameters (Young's modulus) from the measurements made on each of the structural elements of these floors (joists, plates) in condition free movement. A parametric study was then carried out in order to better understand the influence of these constructive principles.