TIRE PHYSICAL QUANTITY CALCULATION APPARATUS, TIRE PHYSICAL QUANTITY CALCULATION METHOD, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a tire physical quantity calculation apparatus which reduces calculation cost, which constructs a model capable of expressing vibration including a horizontal bending mode of a tire, and which uses the model.SOLUTION: Preset physical parameters are inputted as input values to data 14a for a horizontal bending mode, the data 14a being arithmetic expression data 14 required for calculating a specific frequency of the horizontal bending mode, for calculating the specific frequency of the horizontal bending mode. The data 14a for the horizontal bending mode which is the arithmetic expression data 14, is data for operating the arithmetic expression of the specific frequency, derived by applying a Rayleigh method by using: a displacement function expressing vibration of a tread ring satisfying a condition that a strain on the tread ring is zero, in a tire dynamic model defining that side wall parts are a pair of side wall springs for connecting both ends of the tread ring with the wheel; and a kinetic energy and a potential energy acquired from the model.