Dynamic Analysis of a Geared Rotor-Bearing System

論文翻譯標題: 齒輪轉子軸承系統之動態分析
  • 陳 膺中

學生論文: Doctoral Thesis

摘要

In this dissertation the dynamic analysis of a geared rotor-bearing system is investigated Shafts in the system are modeled as Timoshenko beam by taking into account the effects of rotary inertia and gyroscopic moment The coupling effect between lateral and torsional motions due to gears are considered A finite element model of the system is developed by using Lagrangian approach for determination of the natural frequencies of the system and the steady-state responses due to disk unbalance The pressure angle contact ratio and gear-mesh stiffness of the gear pair in the system are treated as time-varying variables in the proposed model while they were considered as constant in previous models Two gear-mesh stiffness models step gear-mesh and nonlinear gear-mesh stiffnesses are investigated Direct time numerical integration based on a fourth-order Runge-Kutta algorithm is used to perform the dynamic analysis of transient responses Viscoelastic bearing supports are used to reduce the vibration of geared rotor-bearing systems Optimization algorithms are employed to lower the vibration caused by residual shaft bow and transmitted forces in viscoelastic bearing supports The present results show that increasing the bearing stiffnesses may suppress the pressure angle and raise the contact ratio of gear pair The difference between gear-mesh deformations of the geared rotor-bearing system with a constant gear-mesh stiffness and with a time-varying gear-mesh stiffness can be reduced by using higher gear-mesh stiffness Residual shaft bows influence significantly lateral responses of the system but hardly affect the natural frequencies of the system The influences of residual shaft bow on vibration responses of the geared rotor-bearing system and on the transmitted forces in viscoelastic bearing supports can be reduced through optimization
獎項日期2014 七月 22
原文English
監督員Siu-Tong Choi (Supervisor)

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