aspects of modeling a single-stud double-leaf partition using the finite element method
In the present paper, a finite-element model of a single-stud double-plate panel structure is implemented to investigate the transmission of diffuse incident sound waves through typical simple lightweight constructions. A parameter study of the effect of including the internal acoustic medium in single-stud double-leaf partitions is performed. Three scenarios are investigated: 1) A panel structure including structure-borne transmission only, i.e. without air inclusions between the plates, 2) a panel structure including an acoustic medium between the plates, and 3) a simplified model where the fluid continuum elements are replaced by a simple spring connection between the two plates. The investigations are performed as parameter studies focusing on the effect of changes in the model. A fully coupled analysis is performed in which solid continuum finite elements are adopted for the structure, whereas the acoustic medium is discretized into fluid continuum elements. The computations are carried out in frequency domain in the range below 2 kHz and the load acts as an approximated diffuse field on one side of the panel. The results show that if some of the studs are free to bend, the transmission is dominated by the structural part and the contributions from the air inclusions are negligible.
Proceedings of Forum Acusticum 2011: 27 June - 01 July, Aalborg, Denmark, 2011