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What is the difference between sound insulation and noise absorption ? Print E-mail

Question:

 

  • What is the difference between sound insulation and noise absorption ?

     

 

 

 

Answer:

 

  • Sound insulation, the first studying subject of scientists in building acoustics, is the attenuation of sound waves pressures when travelling from one area to another area through a sound barrier, for instance a floor/ceiling system or roof/ceiling system or interior partition or exterior wall. Primary sound waves, emitted from a sound source, spread to all directions in the vehicle environment, when striking one face of a barrier (a floor/ceiling system, a roof/ceiling system, an internal or external wall system) will force it to vibrate, thus creating secondary sound waves at the other face of the barrier. Consequently, sound waves pass "through" the barrier but their pressure levels are damped. In other words, the term "sound insulation" is associated with a system made of several components. If anyone says “this material has a good sound insulation”, obviously he/she does not understand the core of the issue.

     

  • Noise absorption, the second studying subject of scientists in building acoustics, indicates the ability of a material to absorb sound wave energy when sound waves hit the material surface. Lighter, more porous (with a labyrinth structure that contains thousands of tiny air pockets), and thicker materials have better sound absorbing properties. Hard, solid, heavy materials are very poor sound absorbing; in other words, sound waves will fully reflect when striking the material surface. Noise absorption treatment of an enclosed compartment refers to lining its surfaces like floor, walls, ceiling with various types of materials that have good sound absorbing characteristics.

 

 
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