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2. Soundproofing - Wikipedia

   en.wikipedia.org/wiki/Soundproofing

   A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...

3. Automotive textile - Wikipedia

   en.wikipedia.org/wiki/Automotive_textile

   Certain performance parameters are required for automotive textiles. [5] [2] Different needs are filled by different types of fiber and structures. High tensile materials are used for airbags. [6] Truck covers are made with PVC or coated polyester material. [1] Textiles are also used for trunk coverings (often needle felts) and cargo tie downs.

4. Acoustic plaster - Wikipedia

   en.wikipedia.org/wiki/Acoustic_plaster

   Acoustic plaster is plaster which contains fibres or aggregate so that it absorbs sound.Early plasters contained asbestos, but newer ones consist of a base layer of absorptive substrate panels, which are typically mineral wool, or a non-combustible inorganic blow-glass granulate.

5. Laminated glass - Wikipedia

   en.wikipedia.org/wiki/Laminated_glass

   Laminated glass is also used to increase the sound insulation rating of a window, because it significantly improves sound attenuation compared to monolithic glass panes of the same thickness. The interlayer is typically of polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), ionoplast polymers, cast in place (CIP) liquid resin, or ...

6. Noise, vibration, and harshness - Wikipedia

   en.wikipedia.org/wiki/Noise,_vibration,_and...

   Specific methods for improving NVH include the use of tuned mass dampers, subframes, balancing, modifying the stiffness or mass of structures, retuning exhausts and intakes, modifying the characteristics of elastomeric isolators, adding sound deadening or absorbing materials, and using active noise control. In some circumstances, substantial ...

7. Acoustic quieting - Wikipedia

   en.wikipedia.org/wiki/Acoustic_quieting

   Sound reflections: by limiting the reflection using many methods, e.g. by using acoustic absorption (deadening) materials, trapping the sound, opening a "window" to let sound out, etc. By analyzing the entire sequence of events, from the source to the observer, an acoustic engineer can provide many ways to quieten the machine.