SUMMARYA dynamic model for geared multi-body system containing gear, bar and shaft is proposed and a new gear element is particularly developed based on a speciÿc ÿnite element theory. The gear element can take into account time-variant meshing sti ness, the gear errors, and the couplings between the torsional and the lateral vibrations of gears. The accuracy and reliability of the gear element are conÿrmed by comparing the simulated with the experimental results of rotational vibration accelerations. A gear-bar mechanism composing one sun gear, one planetary gear and two bars is simulated dynamically. The in uences of non-uniform gear speed, time-variant meshing sti ness and bar sti ness on the dynamic behaviours are investigated.
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