This paper describes the first estimations on the resonance frequency time depending and the influence of a pre-load in dynamic stiffness measurement. A resilient layer in a floating floor could suffer deflection under the slab weight: pliability or fibres breakage in a resilient layer induces a static deflection decrease (thus a relative resonance frequency increase) and, as a consequence, deteriorates the acoustical properties of the insulation layer. Dynamic stiffness is the most important parameter for assessing the acoustical properties of insulation of layers used in floating floors; dynamic stiffness influences the reduction in impact sound pressure level in a floating floor. Besides, the correlation between the elasticity (or the internal damping) of the insulation layers and the insulation curve slope has been examined. This quantity, depending on mass-spring (plateresilient layer) resonance frequency, offers possibilities to estimate empirically the reduction in normalized impact sound pressure level, or the single number DLw, in function of concrete slab weighting.
DYNAMIC STIFFNESS MEASUREMENT: AN EMPIRICAL MODEL TO ESTIMATE THE REDUCTION IN IMPACT SOUND PRESSURE LEVEL AND ITS RELATIVE IMPROVEMENT CURVE / Schiavi, Alessandro; PAVONI BELLI, Andrea; F., Russo. - -:(2004), pp. ---. (Intervento presentato al convegno 18th International Congress on Acoustics tenutosi a Kyoto nel 4-9 Aprile 2004).
DYNAMIC STIFFNESS MEASUREMENT: AN EMPIRICAL MODEL TO ESTIMATE THE REDUCTION IN IMPACT SOUND PRESSURE LEVEL AND ITS RELATIVE IMPROVEMENT CURVE
SCHIAVI, ALESSANDRO;PAVONI BELLI, ANDREA;
2004
Abstract
This paper describes the first estimations on the resonance frequency time depending and the influence of a pre-load in dynamic stiffness measurement. A resilient layer in a floating floor could suffer deflection under the slab weight: pliability or fibres breakage in a resilient layer induces a static deflection decrease (thus a relative resonance frequency increase) and, as a consequence, deteriorates the acoustical properties of the insulation layer. Dynamic stiffness is the most important parameter for assessing the acoustical properties of insulation of layers used in floating floors; dynamic stiffness influences the reduction in impact sound pressure level in a floating floor. Besides, the correlation between the elasticity (or the internal damping) of the insulation layers and the insulation curve slope has been examined. This quantity, depending on mass-spring (plateresilient layer) resonance frequency, offers possibilities to estimate empirically the reduction in normalized impact sound pressure level, or the single number DLw, in function of concrete slab weighting.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
