Tire deformation calculating method and tire deformation calculating apparatus
First Claim
1. A tire deformation calculating method for calculating a deformation of a tire which is rotating on a road surface, the method comprising;
- an acquiring step for acquiring measurement data of acceleration of the rotating tire for a duration corresponding to at least one round of tire rotation, the measurement data of acceleration acquired by an acceleration sensor that is attached to a predetermined portion of the tire;
a signal processing step for deriving time series data of acceleration due to tire deformation from the acquired measurement data of acceleration, by removing a background component of the acquired measurement data of acceleration; and
a deformation calculating step for subjecting the time series data of acceleration due to tire deformation to a time integration of second order so as to obtain displacement data, to thereby calculate the deformation at the predetermined portion of the tire.
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Abstract
A deformation of a rotating tire on a road surface is calculated the following. At first, time series data of acceleration extracted from measurement data of acceleration corresponding to one round of tire rotation is subjected to a time integration of second order to obtain displacement data so as to calculate the deformation at the tread portion. The time series data of acceleration and the displacement data in the non-contact region excluding a road surface contact region on the tire circumference at the tread portion are respectively approximated to calculate a first and a second approximation curves. The two approximation curves are subtracted respectively from the time series data of acceleration and the calculated displacement data, thereby extracting time series data of acceleration due to tire deformation and obtaining the deformation at the tread portion.
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Citations
16 Claims
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1. A tire deformation calculating method for calculating a deformation of a tire which is rotating on a road surface, the method comprising;
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an acquiring step for acquiring measurement data of acceleration of the rotating tire for a duration corresponding to at least one round of tire rotation, the measurement data of acceleration acquired by an acceleration sensor that is attached to a predetermined portion of the tire; a signal processing step for deriving time series data of acceleration due to tire deformation from the acquired measurement data of acceleration, by removing a background component of the acquired measurement data of acceleration; and a deformation calculating step for subjecting the time series data of acceleration due to tire deformation to a time integration of second order so as to obtain displacement data, to thereby calculate the deformation at the predetermined portion of the tire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A tire deformation calculating apparatus for calculating a deformation of a tire which is rotating on a road surface, the apparatus comprising:
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an acquiring unit for acquiring measurement data of acceleration of the rotating tire for a duration corresponding to at least one round of tire rotation, the measurement data of acceleration acquired by an acceleration sensor that is attached to a predetermined portion of the tire; a signal processing unit for deriving time series data of acceleration due to tire deformation from the acquired measurement data of acceleration, by removing a background component of the acquired measurement data of acceleration; and a deformation calculating unit for subjecting the time series data of acceleration due to tire deformation to a time integration of second order so as to obtain displacement data, to thereby calculate the deformation at the predetermined portion of the tire.
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Specification