Words4EV.speak 1.0 (en)

Rolling

Rolling is a broad band noise, rather ow frequency with preferred frequency band depending on the road surface, mainly low for a rough road surface, high for a wet road or equilibrate between low and high for a smooth road. It is as broad band but less directive than the “Load” and “Ventilation”. A good rolling possess a low level, is steady, gliding and reminds a treadmill. It is unsteady when fluctuations or emergences such as “Hooting” appears, if it is too low and erratic it gets closer to “Drumming”. Rolling is a natural noise inherent to the vehicle, informing the driver on the vehicle speed. The vehicle speed as well as the vehicle type mainly affect level. This noise is due to the tyre/road contact, exciting wheel rims mode, panels etc…