Impact Harshness

Impact harshness characterizes the interior sound and vibration resulting from tyre interactions with discrete road disturbances. Impact Harshness has both audible and tactile components. It is triggered by low and medium-speed vehicle contact with road surface irregularities such as: drop-offs, expansion joints, frost heaves, potholes, railroad crossings, storm drains.

Vehicle characteristics that significantly influence the Impact Harshness performance of a vehicle are:

  • Body transmissibility
  • Shock absorber tuning
  • Suspension type and geometry
  • Tyre stiffness - this is determined by size and construction.
  • Bushing stiffness
  • Weight distribution

See also: Road Noise.

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Subjects: Noise & Vibration