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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 ...
A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.
Hush kits can adversely affect the range and performance of the aircraft they are fitted to because of the extra weight. It also reduces engine performance and aerodynamic efficiency. For example, the hush kit fitted to the Gulfstream II adds 106 kilograms (234 lb) to the total airplane weight of 65,500 lb (29,700 kg), causing around a 1.6% ...
The top speed is 250 km/h (155 mph), but this was electronically throttled to 250 km/h (155 mph).The sound of the high performance exhaust system made of stainless steel can be changed: There are the quiet "Coming Home Mode" or the booming "Sport Mode" to choose from. [1]
The B3 has an Akrapovič stainless steel exhaust system featuring quad exhaust pipes. The exhaust system has an electronically controlled valve that remains closed up to 2,500 rpm for more quiet city driving in comfort mode. In Sport mode however, the valve remains permanently open to provide optimum performance.
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.