Pitch – The physical quality of sound that relates to the frequency of the wave. Radial Force Variation (RFV) – A measurement of the tire’s uniformity, under load, in regards to the variation of the load acting towards the center of the tire; commonly referred to as the tire’s sidewall variation. Radial Run out – A condition where a rotating
Audible Range of Sound – Sounds that are in the range of 20 to 20,000 Hertz (Hz). Amplitude – The vertical measurement between the top and bottom of a wave. Also see magnitude. Beat – An NVH concern produced by two sounds that is most noticeable when the frequency difference is 1 to 6 Hz. Bead Seating – The process
Noise: Noise is defined as any unpleasant or unexpected sound created by a vibrating object. Vibration: Vibration is defined as any objectionable repetitive motion of an object, back-and-forth or up-and-down. Harshness: Harshness is defined as an aggressive suspension feel or lack of “give” in response to a single input. Noise and Vibration Theory: A vibrating object normally produces sound, and
NVH stands for noise, vibration, and harshness. Noise is unwanted sound; vibration is the oscillation that is typically felt rather than heard. Harshness is generally used to describe the severity and discomfort associated with unwanted sound and/or vibration, especially from short duration events. The automotive industry is currently spending millions of dollars on NVH work to develop new materials and
