Abstract
This paper presents the development and validation of a six degree of freedom (DOF) dynamic model of a two-stage parallel shaft gearbox, without flaws, which is able to determine the reaction of gearbox components to varying torque inputs and loads. The model utilises flexible shafts and gears rather than using a rigid assumption, to further understand the effect of varying mesh stiffness. The paper replicates the results presented by Diehl and Tang, and improves the number of frequencies that can be analysed. The gear meshing frequencies were expected to dominate the result, however due to the use of a sinusoidal approximation of the varying tooth mesh frequency, the presented model shows the additional gear generated frequencies are present and analysable in the data.
Highlights
Large scale two-stage speed reduction gearboxes are a key component in the operation of air cooled condensers common in minimal water loss systems for utility scale power generation
Numerical models of multi-stage gear systems have been developed to determine the effect of internal defects to the noise and vibration level of an operational gearbox [1]
The gear dynamics are assumed to be dominated by the changing mesh stiffness that occur between engaged tooth pairs as discussed in section 2 and further in Chaari et al [15], Philippe [16] and Pedrero et al [17]
Summary
Large scale two-stage speed reduction gearboxes are a key component in the operation of air cooled condensers common in minimal water loss systems for utility scale power generation. Numerical models of multi-stage gear systems have been developed to determine the effect of internal defects to the noise and vibration level of an operational gearbox [1]. These flaws amongst many include: tooth wear, fatigue failure and manufacturing errors [2]. This aids in the the study of gear faults and the development of condition monitoring methods [3] Used standards such as AGMA 2101-D04 [4], empirically develop gear design safety factors to account for all parameters and loads that influence gear life. The research focuses on utilising flexible shafts and gears to give further insight into the dynamic behaviour of the gearbox components
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