An empirical expression for loss factor

作者：del Rey R^*; Alba J; Ramis J; Julia E; Segura J

来源：Revista Internacional de Metodos Numericos Para Calculo y Diseno en Ingenieria, 2012, 28(3): 142-147.

DOI：10.1016/j.rimni.2012.03.010

• Structural reverberation time
• Vibrations
• Acoustic isolation
• Loss factor
• Empirical adjustment

Noise transmitted by the sidewalls of buildings is essential to study the overall airborne sound insulation. For the determination of the lateral transmissions we must determine a parameter known as vibration reduction index. To obtain the value of the vibration reduction index to know the acoustic behaviour of the whole constructive, it is necessary to know the velocity level difference and the structural reverberation time. The indeterminations in the velocity level difference, or in the structural reverberation time will add diversions in the global determination of the isolation of the whole constructive. %26lt;br%26gt;In the Standard UNE EN 12354-1:2000 there are empirical expressions for obtained the structural reverberation time. In the Standard UNE-EN ISO 10848-1:2007 there is a detailed procedure to determine experimentally the velocity level difference and the structural reverberation time, and to know the sidewalls transmissions. %26lt;br%26gt;In this work, it is compared the structural reverberation time obtained by empirical expression and the structural reverberation time obtained experimentally, applying the normalized procedure. Based on this comparison we readjusted the empirical equations with a fundamental parameter; the loss factor. It is observed that the estimates do not reflect reality if we consider the same loss factor for all the structural elements, as it is allowed in the predictions of UNE EN 12354.

• 出版日期2012