| 摘要 |
A wheel balance measuring apparatus has a wheel-mounting shaft (23) together with force transducers (29, 31). The transducers (29, 31) are coupled to the shaft and provide signals indicative of unbalance forces transmitted through the rotating shaft. The angular position of the shaft is monitored with respect to an angular datum at a predetermined number of angular increments during each shaft revolution. The signals are converted to digital form, and the digitized signals are multipled at each angular increment using sine and cosine representative factors corresponding to that particular angular increment. The sine and cosine factors are stored in a memory within a computer 61 and are called up from storage in accordance with the monitored angular position of the shaft. Digitized signals including sine and cosine factors are summed thereby providing operating data from which unbalance force magnitude and angular position is calculated. |
