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Roadway noise is the collective sound energy emanating from motor vehicles. It consists chiefly of road surface , tire, engine /transmission, aerodynamic, and braking elements. Noise of rolling tires driving on pavement is found to be the biggest contributor of highway noise and increases with higher vehicle speeds.
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.
Active noise cancelling (ANC) is a software process that uses existing in-vehicle infotainment hardware to eliminate undesirable noise within the interior of a vehicle. This elimination technique is known as harmonic order reduction, where unwanted audio signals are identified by sensors and filtered out of the overall interior vehicle sound. [3]
Vehicles that can operate singly (single car DMUs and locomotives) only have one; this could be either at the front or rear depending on the direction the vehicle is traveling in. The equipment on a train consists of; An AWS receiver (a magnetic field detector located under the driving cab of the train)
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The Lincoln LS is a four-door, five-passenger luxury sedan manufactured and marketed by Ford's Lincoln division over a single generation from 1999 until 2006. Introduced in June 1999 for the 2000 model year, the LS featured rear-wheel drive and near 50/50 weight distribution [1] and was available with a V8 or V6, the latter initially offered with a manual transmission.
A suite of sound-deadening features called QuietTuning is now standard on all Buick models, including the Rendezvous. QuietTuning consists of laminated front door glass, revised foam sealing for the outside mirrors and door handles, and denser sound-absorbing material inside the hood, on the firewall , and within the instrument panel.
Dynaflow (Buick) The Dynaflow was an automatic transmission used in various forms in Buick cars by the General Motors Corporation from 1947 until 1963. The transmission initially used a five-element torque converter, with two impellers and two stators, as well as a planetary gearset that provided two forward speeds plus reverse.