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1 International Journal of Applied Mechanics and Engineering

1 2008

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Calculation of natural frequency and mode shapes for a high speed bevel gear

Michalska A., Marciniec A.

International Journal of Applied Mechanics and Engineering

2008

Vol. 13, no 2

415-426

The aim of this article is to analyze free vibrations of the tower shaft that drives the accessory gearbox used in a turbofan aircraft engine. The engine is used to power a midsize business jet. The problem was solved in two ways: by a frequency response measurement test and by employing the dynamic FEA (Finite Element Analysis) that can predict the modal shapes quite accurately (Ramil et al., 2004 and Li et al., 2004). The analysis conducted on an accurate model shows that results were very close to those achieved during the frequency response measurement test. However, working with such a complex model is time-consuming, impossible for preliminary analysis and, as demonstrated in this article, unnecessary. The purpose of this study was to work out a method that would minimize the total time necessary to conduct the analysis while maintaining the good level of accuracy.