The Role of Studs in the Sound Transmission of Double Walls

Abstract

Steel studs are used in double walls to provide structural stability. This creates a vibration transmission path between leaves that can often be more critical than the airborne path through the cavity. Some of the existing models for sound transmission consider the studs as elastic springs. The spring stiffness may be taken as the cross-section elastic stiffness of the stud, but this leads to an underestimation of the vibration transmission. A procedure to obtain more accurate parameters to be used in vibration and sound insulation models is presented. The results show that they must be obtained from dynamic models and/or experiments.

A deterministic model of impact noise transmission through structural connections based on modal analysis

“…It has also been shown by Poblet-Puig et al [23] that it is possible to use springs to represent the studs that connect them in order to further simplify the model. Either translational or rotational springs may be used to reproduce the behaviour of real studs with a fitting of frequency-dependent stiffness.…”

“…Either translational or rotational springs may be used to reproduce the behaviour of real studs with a fitting of frequency-dependent stiffness. Some 2D models about the effect of different shapes of studs in the vibration level difference on lightweight floors are presented in [23] and simplified models as those shown in Fig. 5 are validated by comparing them with finite element analyses that consider the shape of the studs.…”

The Finite Strip Method for Acoustic and Vibroacoustic Problems

“…They are often cosines, see Eq. (27), and the constant function is necessary. On the contrary, the subscript q of the structural functions Z q (z) starts at 1.…”

“…The pressure field clearly has a wave in the z direction and cannot be described by the functions Z 0 (z) (constant along the z direction) and Z 1 (z) (half wave along the z direction, see Eq. (27)). At least Z 2 (z) is required.…”

“…Interpolation functions defined in Eq. (27) are used, thus the floors and the ceilings of the rooms are purely reflecting. A width of 0.1 m has been given to all the vertical partitions.…”