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  2. Soundproofing - Wikipedia

    en.wikipedia.org/wiki/Soundproofing

    Vehicle soundproofing can reduce wind, engine, road, and tire noise. Vehicle soundproofing can reduce sound inside a vehicle from five to 20 decibels. [21] Surface-damping materials are very effective at reducing structure-borne noise. Passive damping materials have been used since the early 1960s in the aerospace industry.

  3. Blowout (tire) - Wikipedia

    en.wikipedia.org/wiki/Blowout_(tire)

    A blowout (also known as a burst) is a rapid, explosive loss of inflation pressure of a pneumatic tire. The primary cause for a blowout is encountering an object that cuts or tears the structural components of the tire to the point where the structure is incapable of containing the compressed air , with the escaping air adding to further tear ...

  4. 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.

  5. Acoustic liner - Wikipedia

    en.wikipedia.org/wiki/Acoustic_liner

    The lower half of a liner features dedicated internal slots to allow liquid drainage in order to prevent ice formation or fire hazards. From an acoustic perspective, this implies that the upper acoustic panel is a locally reacting liner, whereas the lower one is a non-locally reacting liner. [1]

  6. Acoustic metamaterial - Wikipedia

    en.wikipedia.org/wiki/Acoustic_metamaterial

    An acoustic metamaterial, sonic crystal, or phononic crystal is a material designed to manipulate sound waves or phonons in gases, liquids, and solids (crystal lattices).By carefully controlling properties such as the bulk modulus β, density ρ, and chirality, these materials can be tailored to interact with sound in specific ways, such as transmitting, trapping, or amplifying waves at ...

  7. Noise control - Wikipedia

    en.wikipedia.org/wiki/Noise_control

    Electric and hybrid vehicles could reduce noise pollution, but only if those vehicles make up a high proportion of total vehicles on the road; even if traffic in an urban area reached a makeup of fifty percent electric vehicles, the overall noise reduction achieved would only be a few decibels and would be barely noticeable. [12]

  8. Noise barrier - Wikipedia

    en.wikipedia.org/wiki/Noise_barrier

    The sound tube in Melbourne, Australia, designed to reduce roadway noise without detracting from the area's aesthetics. A noise barrier (also called a soundwall, noise wall, sound berm, sound barrier, or acoustical barrier) is an exterior structure designed to protect inhabitants of sensitive land use areas from noise pollution.

  9. Vibration isolation - Wikipedia

    en.wikipedia.org/wiki/Vibration_isolation

    The fluid in automotive shock absorbers is a kind of damper, as is the inherent damping in elastomeric (rubber) engine mounts. Damping is used in passive isolators to reduce the amount of amplification at the natural frequency. However, increasing damping tends to reduce isolation at the higher frequencies.