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Wheel unbalance measurement system and method

  • US 4,285,240 A
  • Filed: 01/11/1980
  • Issued: 08/25/1981
  • Est. Priority Date: 01/11/1980
  • Status: Expired due to Term
First Claim
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1. A method of measuring unbalance in a rotating body mounted on a rotating shaft coupled to a force transducer providing an unbalance signal indicative of the instantaneous unbalance magnitude component relative to a known angular reference, comprising the steps of digitizing the unbalance signal, sampling the digitized unbalance signal at each of a predetermined number of angular increments of shaft rotation, storing a plurality of digital sine and cosine representative quantities corresponding to predetermined ones of the angular increments, combining the sampled digitized unbalance signal with the corresponding sine quantity and with the corresponding cosine quantity, the step of combining being limited to include no more than one addition step so that the combinations are obtained during the time the shaft transits each angular increment, whereby separate combined digital quantities are obtained containing sine factors and cosine factors, summing the quantities containing the sine factors over a predetermined number of angular increments, summing the quantities containing the cosine factors over the predetermined number of angular increments, whereby data is obtained indicative of unbalance magnitude and angular position relative to the known angular reference.

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