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Transmission loss (TL) in duct acoustics describes the acoustic performances of a muffler-like system.It is frequently used in the industry areas such as muffler manufacturers and NVH (noise, vibration and harshness) department of automobile manufacturers, and in academic studies.
This lower flow but slightly quieter design approach is commonly used in glasspack mufflers. Some modern muffler designs are similar in principle to the glasspack, but use more sophisticated sound-absorbing materials such as stainless steel mesh, and more advanced acoustic engineering, reducing noise while retaining the power-preserving ...
In past decades, appearance packages have also included two-tone paint, pin striping, bumpers painted the same color as the vehicle body, and vinyl roof covers. Sports/performance package: May include engine upgrades, handling upgrades (see below), a more aggressive front spoiler, a rear wing, upgraded brakes, and a limited slip differential .
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 ...
That where the technology is available, drivers should only use the low tone from the two tone horn at whistle boards. For all new or replacement train horns on trains capable of travelling up to 100 mph (160 km/h) a much lower minimum sound pressure level has been established – and a maximum sound level has been introduced (min 101 dB and ...
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