METHOD OF CORRECTING UNIFORMITY WAVEFORM OF TIRE

摘要

A uniformity waveform for a tire (T) and a rotational phase of a load drum (4) are measured with a load drum (4) pressed against the tire (T). In a waveform of the frequency domain acquired by frequency conversion of the uniformity waveform, the amplitude and phase for a component of an integer multiple of the rotational frequency of the load drum (4) are found and stored as a correction parameter. A corrected tire (T) uniformity waveform is calculated by subtracting from the uniformity waveform a correction waveform calculated on the basis of the correction parameter, the correction waveform being the one in the rotational phase range of the load drum (4) during tire measurement.

主权项

1. A method of correcting a uniformity waveform of a tire, at the time when uniformity of the tire is measured while the tire is caused to rotate with a load drum pressed against the tire different in diameter from the load drum, the method comprising the steps of;
measuring the uniformity of the tire and a rotational phase of the load drum, using a load cell and a rotational phase meter provided to the load drum; frequency-converting a measured uniformity waveform into a waveform in a frequency domain; finding an amplitude and a phase in a component of an integral multiple of a rotational frequency of the load drum, in a waveform in the converted frequency domain; storing as a correction parameter the found amplitude and phase in the component of the integral multiple of the rotational frequency of the load drum; measuring the uniformity waveform of the tire and calculating a correction waveform in a range of a rotational phase of the load drum during tire measurement based on the stored correction parameter; and computing the corrected uniformity waveform of the tire by subtracting the calculated correction waveform from the measured uniformity waveform.