Sound  insulation  walling  with  vibration  absorption.  Part  1
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Protect the surface of the concrete floor
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 Sound  insulation  walling  with  vibration  absorption.  Part  1

To provide the acoustic comfort of residential and public buildings must tend to increase isolation of airborne and impact noise. To increase the airborne sound insulation is often necessary to increase the mass of the fence, for impact sound insulation clean "sound bridges" in the construction of fences. These tasks fully meet multilayer vibrodempfirovannye fencing, consisting of hard outer sheets (for example, metal, drywall, glass) and internal vibration-absorbing layer. Unlike traditional designs used for soundproofing, these fences have high structural loss factor and increased stability.
   Passage of sound through the layered structure was investigated previously and described in many published studies. Thus, the problem of sound transmission through a system of alternating solid layers of infinite extent addressed in the works of LM Brekhovskikh, LM Lyamshev, VI Zaborova, L. Beranek. It is noted that when the layer system is composed of parallel plates with no solid layers of liquid therebetween, a task can not be reduced to the case of single-layer plate. The equation of motion for an individual layer must be associated with the equations of motion of the adjacent layer continuity of particle velocity normal and tangential stresses at the interface.
   There are papers on the analysis of sandwich panels with insulation between the metal sheets filling materials such as foams. So, Mr. Kurtz examines the contribution of flexural and shear waves in the total movement of such panels. [1]
   He comes to the conclusion that at high frequencies is defining stiffness external sheets. The panel would have better soundproofing, if it will be distributed shear waves instead of bending waves, provided that the velocity of shear waves will be significantly less than the speed of sound in air. Effect of loss due to internal friction cover only at high frequencies - in cutoff frequency above that frequency.
   Consider the process of sound transmission through a rectangular sandwich panels size ax in the intermediate layer vibrodempfiruyuschim hinged support contour.
  
   To be continued.

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