1 XL â or EXL, Exploration Licence (United Kingdom), a type of onshore licence issued between the First Onshore Licensing Round (1986) and the Sixth (1992). 2  Xln â Crystalline (minerals). 3  XLPE-Cross-linked Polyethylene. 4  XMAC â Cross-Multipole Array Acoustic log.
When the frequency approaches 120 CPM (2 Hz), occupants perceive the ride as harsh. Consequently, the suspension of the average family sedan will have a natural frequency of about 60 to 90 CPM. A high-performance sports car will have a stiffer suspension with a natural frequency of about 120 to 150 CPM (2 to 2.5 Hz). Originally, human sensitivity to ride frequency was believed to be associated with the natural oscillations of an adult human body during a walking gait.
Best Answer: The resonator on a car is a hollow chamber in the exhaust tract. Its location is placed a certain distance from the muffler and engine to allow the resonant effect. This is to dampen parts of the noise coming from the engine and enhance other parts of it. Factory car makers tune the location of this resonator to tune the sound of your exhaust to better match the nature of your car ie sporty(loud) vs luxury(quiet) exhaust. Source(s): http://en.wikipedia.org/wiki/Resonator