Dynamic balancing system and method

Measuring and testing – Rotor unbalance – Dynamic

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73 1B, G01M 122

Patent

active

047762152

ABSTRACT:
Disclosed is a system and method for accurately balancing a wheel/tire assembly. The assembly is mounted onto a shaft of a dynamic wheel balancer to rotate therewith. The shaft and wheel/tire assembly are spun while the balancer senses and stores a first set of information (readings) indicating imbalance. Next, the wheel/tire assembly is released and reoriented at a different angle, for example 180 degrees, on the shaft of the balancer, followed by respinning the wheel/tire assembly while the balancer takes a second set of readings indicating imbalance under these changed conditions. The values of both sets of readings are stored and then compared to note the difference therebetween. The difference represents a measure of the aggregate actual and "apparent" imbalance. For example, if the reorientation is 180 degrees, then the difference will be twice the actual imbalance. If the reorientation is less than 180 degrees, then the difference will be proportionately less than twice the actual imbalance. Apparent imbalance may be cauased by (i) an unbalanced shaft, (ii) axial vibrations of the shaft caused by face plate run-out, (iii) bearing and belt noise under load, (iv) motor noise under load, etc. Any such difference is stored and later subtracted from future balancing readings in order to more accurately determine the correct amount of counterbalancing weight to be added to a wheel/tire assembly, so that the wheel will remain balanced after removal from the shaft.

REFERENCES:
patent: Re31971 (1985-08-01), Gold
patent: 4338818 (1982-07-01), Hill et al.
patent: 4348885 (1982-12-01), Mueller
patent: 4352291 (1982-10-01), Churchod
patent: 4424711 (1984-01-01), Giers et al.
patent: 4480472 (1984-11-01), Wood

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