An investigation into the balancing of high speed, flexible shafts by external application of compensating balancing sleeves

Knowles, Grahame, Bingham, Chris and Bickerton, Ron (2021) An investigation into the balancing of high speed, flexible shafts by external application of compensating balancing sleeves. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science . ISSN 0954-4062

Full content URL: https://doi.org/10.1177/09544062211008469

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An investigation into the balancing of high speed, flexible shafts by external application of compensating balancing sleeves
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Abstract

The paper investigates the use of compensating balancing sleeves positioned at the shaft’s end for the balancing of high-speed flexible shafts. The balancing sleeve is a new arrangement that creates a pure balancing moment with virtually zero radial reaction forces. For comparison purposes, experimental results from previous research are used to benchmark performance and to demonstrate the benefits newly proposed topology. The new configuration is commensurate with what is required for the Power Turbine (PT) shaft of a twin shaft industrial gas turbine, with an overhung disc. The study is also aimed at bladed shafts, such as those used in high speed gas turbines/compressors, with a view to improving their volumetric efficiency by reducing the formation of relatively large tip leakage gaps caused by shaft deflection/blade wear of abradable seals. It is shown to be practically possible to separate the two main dynamic balancing functions i.e. the control of bearing reaction loads and shaft deflections, thus allowing for their independent adjustment. This enables the required balancing sleeve moment to be determined and set during low-speed commissioning i.e. before any excessive shaft deflection and resulting seal wear occurs, as is typical when final balancing is undertaken at full operational speed.

Keywords:High-speed shafts, lateral vibration, balancing sleeve, critical speed, design
Subjects:H Engineering > H150 Engineering Design
H Engineering > H321 Turbine Technology
Divisions:College of Science > School of Engineering
ID Code:45815
Deposited On:19 Jul 2021 13:06

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