The Evaluation of the Effectiveness of Design and Technological Solutions to Reduce Vibration Activity of Drive Gear Mechanisms Based on the Analysis of Normal Vibration Modes

At present, practically all machine manufacturers face the problem of improving vibroacoustic characteristics of drive gear mechanisms. In this regard, it is important at the design stage to assess the feasibility of new design and technological solutions and the choice of gear parameters from the point of view of optimization of the dynamic characteristics of the drive. It can be achieved through a comparative quality assessment of dynamic systems based on the analysis of their normal modes. The rationale for this approach lies in the fact that initially there is no consistent data about dissipative characteristics of junctions, parts and materials of the elastic elements. When comparing various dynamic schemes, it is proposed to use the vibration activity criterion Hk. It is expressed using an additionally introduced coefficient that characterizes the relation of the parameters of the shock pulses occurring when the compared systems are engaged. The shape of the excitation pulses in the meshing of the drive gears is adopted in the form of half-sine waves, which differs from the generally accepted rectangular shape. The authors consider an example in which the Hk criterion is applied for evaluating the efficiency of design solutions to reduce vibration activity of gears by using a compound gear with elastic fastening and high compliance of the toothing. As a result of the refined calculations, the value of the vibration activity criterion of the compared dynamic schemes is obtained. This value is better correlated with the results of experimental studies.

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