RMOD-K requires a set of certain measurements depending on the simulation tasks of the user, in general measurement of following groups are:

  1. General Data (Dimension and mass)
  2. Topology Data (Cross Section, belt angle)
  3. Force and Moments (F&M)
  4. Cleat Measurements
  5. Modal System
  6. Additional Data (Stiffness)

Details of each mesurement group:

General Data: Tire dimension : tire width, aspect ratio, rim radius, load index, rim width, rim type, reference inflation pressure, tire mass without rim

Topology Data: cross section of outer and inner line in rim mounted position under inflation pressure or alternative only outer line and thickness distribution for each 10mm. Belt angle.

Force and Moments (F&M): measurements for traction and steering at 80km/h - 100km/h (LI-based i.e.: 0.15, 0.3, 0.45, 0.6, 0.75, 1.0)  or Magic Formula 5.2 tirefiles

Cleat Measurements: 0 and 45 degree cleat on drum (drum radius and surface type) with fixed hub for a set of long. velocity (from 20km/h up to maximum with 20km/h or 30km/h steps), inflation pressure (+-0.5 bar), vertical load (0.5, 0.8 and 1.1 LI) and different cleat dimensions corresponding to length and height (5mm x 10mm, 10mm x 10mm, 20mm x 20mm, for 45 degree cleats only 20mm x 20mm; cleat phase must be known), measurement rim's moment of inertia about rolling axis.

Modal System: modes and mode shape of rigid modes, radial modes and tangential modes up to 300 Hz of an unloaded tire under inflation pressure.

Additional Data: quasitatic stiffness data:

Vertical stiffness on drum or flat road including inner contact, longitudinal Stiffness (0.4, 0.8 and 1.2 LI up to 10mm longitudinal displacement) , lateral stiffness (0.4, 0.8 and 1.2 LI up to 20mm lateral displacement) and torsional stiffness (parking measurement) (0.4, 0.8 and 1.2 LI up to 15degree steer angle) for zero rolling velocity.

Additional Data: dynamic vertical stiffness data if it is on interest: preferred type of exitation is ground based (velocity range: 0km/h, 30km/h, 70km/h; LI 0.8; reference pressure, vertical amplitude 0.5mm 1mm and 2mm, frequence from 1 to 25 hz or sweep to 50hz with 1.2mm).

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Detailed desciption:


Pdf: Measurement and Parameterdetermination of the Modeling System RMOD-K 7

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