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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.
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.
Noise, vibration, and harshness (NVH), also known as noise and vibration (N&V), is the study and modification of the noise and vibration characteristics of vehicles, particularly cars and trucks. While noise and vibration can be readily measured, harshness is a subjective quality, and is measured either via jury evaluations, or with analytical ...
Making a sound wave transfer through different layers of material with different densities assists in noise damping. Hopefully I've re-added that in clearer form. Open-celled foam is not a good sound damper inside of a wall, as the foam is too dense and offers insufficient surface area for sound wave interaction.
Sheller-Globe Corporation was a U.S. auto parts manufacturer and industrial conglomerate based in Toledo, Ohio.Formed in 1966 on a heritage of much older companies, Sheller-Globe grew through the acquisition (and divesture) of many other businesses before it was acquired by United Technologies Corporation in 1989.
Silencer (silver) and exhaust pipe on a Ducati motorcycle A silencer cut open to show the insulation, chambers and piping inside the shell. A muffler (North American and Australian English) [1] or silencer (British English) is a device for reducing the noise emitted by the exhaust of an internal combustion engine—especially a noise-deadening device forming part of the exhaust system of an ...
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