Method and apparatus for determining a restoring moment produced

Details Method and apparatus for determining a restoring moment produced Method and apparatus for determining a restoring moment produced

1990-01-18

1991-02-05

Woodiel, Donald O.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

G01M 1702

Patent

active

049894498

ABSTRACT:
In a method and an apparatus for determining the restoring moment produced by tangential forces in a tire testing operation, a tire to be tested is rolled against a test surface under identical rolling conditions in first and second measuring runs, the second of which is performed with the tire being turned round through 180.degree. from its position in the first measuring run. The restoring moment which is related to the center of the contact surface at which the tire is in contact with the test surface is formed from the restoring moment values which are obtained in the first and second measuring runs. The apparatus includes an evaluation circuit having a subtracting means for subtracting the restoring moments obtained in the two measuring runs from each other and a dividing circuit for halving the output signal from the subtracting circuit, or alternatively the evaluation circuit includes an adding circuit for adding the restoring moments obtained in the two measuring runs and a dividing circuit for halving the output of the adding circuit together with a subtracting circuit for subtracting from each other the output from the dividing circuit and an input signal proportional to one of the restoring moments obtained in the two measuring runs.

REFERENCES:
patent: 3942370 (1976-03-01), Grosch et al.
patent: 3956931 (1976-05-01), Grosch et al.

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