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The assumptions relating to power flow as a function of position and number of fasteners between the gypsum board and RC's was examined. It was observed that studs had both a rotational and translation motion but the translation displacement coupled more strongly than rotation. It was also observed that if the rotation velocity was less than or equal to the translation velocity, then structure borne transmission due to the rotation component could be ignored for frequencies below 2500 Hz. The results show that there is little effect associated with either the location or the number of fasteners attaching the gypsum board to the RC's about 315 Hz.
The simplifications used while creating a model for structure borne transmission from a wood stud to a gypsum board mounted on RCs are discussed.
Above 400 Hz power transmission is determined by stud translation, is propotional to the number of RCs, and is independent of number and location of fasteners between gypsum board and RCs.
In this frequency range it is possible to use the mobility approach if RCs can be approximated by a series of idealised springs located at points of intersection between stud and RCs. The dynamic stiffness of each spring is equal to that of the RC at a stud.
Metall macht leise.
(2006)
