Herringbone Gears Essay

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CONSTRUCTION OF A MODEL FOR VARIABLE SPEED PROCESS FOR HERRINGBONE GEARS INCLUDING FRICTION CALCULATED BY VARIABLE FRICTION COEFFICIENT ABSTRACT A dynamic model that includes friction and tooth profile error excitation for herringbone gears is proposed for the dynamic analysis of variable speed processes. In this model, the position of the contact line and the relative sliding velocities are determined by the angular displacement of the gear pair. The translational and angular displacements are chosen as the generalized coordinates to construct the dynamic model. The friction is calculated using a variable friction coefficient. The tooth profile error excitation is assumed to depend on the position along the contact line and to vary with the angular displacement of the driving gear. Thus , the proposed model can be used in the dynamic analysis of the variable speed process of a herringbone gear transmission system. An example acceleration process is numerically simulated using the model proposed in this paper. The dynamic responses are compared with those from the model utilizing a constant friction coefficient and without friction in cases where the profile error excitations are included and ignored. Chapter 1. INTRODUCTION Herringbone gars offer advantages such as smooth transmission, greater torque transmission and low axial force; hence, they are widely used in gas turbines, ships and engineering machinery such as coal mining machinery, many of which work under variable speed processes. Vibration and noise have significant effects on the reliability and service life of a gear transmission system. Thus, it is essential to construct a precise dynamic model for a herringbone gear transmission system used for a variable speed process to obtain a more accurate dynamic response and improve the reliability and service life. Friction

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