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The shaft manufacturing bending deviation occurs frequently in many types of shaft applications, such as crank shaft and roller shaft, and this issue will eventually affect the overall dynamic performance of the rotor–shaft-bearing system. In this study, a systematic modeling approach is developed to analyze the effect of shaft manufacturing bending deviation on the dynamic behavior of the geared rotor system. To validate the proposed approach, a practical example of spur geared rotor system was used and the shaft manufacturing bending deviation data were measured by a shaft testing bench. The whole system was modeled using a finite element method and the dynamic characteristics of meshing gear pair were represented by a coupled torsional–lateral gear dynamic model. Then, the effects of the dynamic gear mesh force, magnitude of deviation, position of deviation, and rotating speed on the dynamic responses of the geared rotor system were evaluated. The calculation results show that these parameters have different effects on the systematic vibration response of the geared rotor system, indicating that the geared rotor system has different dynamic sensitivities to those different excitations. This study helps to get a better understanding of the dynamic behavior of the geared rotor system with shaft bending deviation and can provide guidance for quality control of shaft manufacturing process in view of system dynamics.

Effect of shaft manufacturing bending deviation on dynamic response of geared rotor system