Dispersion and absorption of structure-borne sound in acoustically thick plates

✍ Scribed by J.H. Rindel

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 597 KB
• Volume: 41
• Category: Article
• ISSN: 0003-682X
• DOI: 10.1016/0003-682x(94)90063-9

✦ Synopsis

A BS TRA C T Building constructions made from concrete, light-weight concrete and brickwork are often so thick that the propagation of structural sound is shifted from bending waves to shear waves within the frequency range of building acoustics. This means that the dispersion function for the phase speed will be a complicated function of the frequency, which among other things influences the modal density. For such so called acoustically thick plates a theoretical basis is presented which has been confirmed through measurements of phase speed as a function of the frequency for a number of wall and slab elements. The loss factor has also been measured, using the time reverse decay method in order to avoid measuring errors from the third octave band filters. Measured acoustic data for clinker concrete and porous concrete are given.