ACOUSTIC INSULATION OF SINGLE PANEL WALLS PROVIDED BY ANALYTICAL EXPRESSIONS VERSUS THE MASS LAW
✍ Scribed by A. TADEU; J.M.P. ANTÓNIO
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 454 KB
- Volume
- 257
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
Analytical solutions are presented for the calculation of the acoustic insulation provided by an in"nite single panel wall when subjected to a spatially sinusoidal harmonic line load or a point pressure load (modelled as a superposition of spatially sinusoidal harmonic line loads). The method used does not entail limiting the thickness of the layer, as the Kirchho! or Mindlin theory requires, and fully takes into account the coupling between the #uid (air) and the solid panel. All calculations are performed in the frequency domain. Time signatures are obtained by means of inverse Fourier transforms. Special attention is given to the limitations of the simpli"ed models, which are not able to predict dips of insulation such as that due to the coincidence e!ect. It has been shown that, although time results may appear complicated, the arrival of various pulses at the receivers can be understood in terms of the travelling body pulses and guided waves. Simulated results have been computed for ceramic, concrete and glass walls of di!erent thickness, when subjected to plane, linear and spherical waves. The insulation computed was found to be highly dependent on receiver position, given the interaction between the incident wave "eld and the directed re#ected "eld on the wall, when the wall is struck by a cylindrical or a spherical pulse wave.