Abstract : Two concepts relating to gear dynamics were studied. The first phase involved the analysis of the effect of the speed of a moving load on the dynamic deflections of a gear tooth. A single spur gear tooth modelled using finite elements was subjected to moving loads with variable velocities. The tooth tip deflection time histories were plotted, from which it was seen that the tooth tip deflection consisted of a quasistatic response with an oscillatory response superimposed on it whose amplitude was dependent on the type of load engagement. Including the rim in the analysis added flexibility to the model but did not change the general behaviour of the system. The second phase involved an investigation to determine the effect on the dynamic response of the inertia of the gear tooth. A simplified analysis using meshing cantilever beams was used. In one case, the beams were assumed massless, in the other, the mass (inertia) of the beams are included. From this analysis it was found that the inertia of the tooth did not affect the dynamic response of meshing cantilever beams. Keyword: Gear noise; Vibration; Machine design; Finite element analysis.
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