Abstract
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.
Highlights
Rotating machines are extensively used throughout the engineering applications for power generation and transmission
Z-directions are Fu cos(as ) and Fu sin(as ), respectively. Both the values of ru and as were measured based on the shaft testing bench, and the results show that, for this example geared system, the value of ru locates in the range of 0.01–1 mm and the value of as occupies the range of 0°–360°
The bending deviation of a few samples of the example shaft was measured using the testing bench and the results show that the value of ru locates in the range of
Summary
Rotating machines are extensively used throughout the engineering applications for power generation and transmission. In these applications, the geared rotor systems are typically employed for changing speeds and/or working direction. On account of the increasing demand for high speed and light weight, the research in the field of geared rotor dynamics becomes more and more important. This is because the geared rotor system under high-speed operating conditions tends to have more severe noise and vibration, durability, and efficiency issues, especially when there are manufacturing deviations of components such as shaft. It is essential to investigate the dynamic behavior of the geared rotor system with certain shaft deviations to gain an in-depth understanding of the underlying physics to facilitate the design and development of quieter and more durable geared rotor systems.
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