Patent ID: 8437905

Claim:
A method of calculating deflection of a rotating tire that calculates a distribution of deflections at a tire tread portion in a radial direction of the tire when the tire is rotating on a road surface, the method comprising: an acquiring step of acquiring measurement time series data of acceleration in a radial direction at a predetermined position on a tire circumference of a rotating tire; a least-square regression step of extracting acceleration data in a vicinity of a contact region of the tire from the acquired measurement time series data of acceleration at the predetermined position on the tire circumference, and, using a deflection function expression that represents a peak shape having a peak value and a curve which is gradually approaching to zero on both sides of the peak shape as a function expression for reproducing the distribution of deflections at the tire tread portion, subjecting the extracted acceleration data to least-square regression using a second-order differential function expression of the deflection function expression to determine deflection function parameter value of the deflection function expression, solely from the acquired time series data of acceleration; and a calculation step of calculating reproduced distribution of deflections of the rotating tire from the deflection function expression the deflection function parameter values of which have been determined.