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research-article

A novel method for the design of proximity sensor configuration for rotor blade tip timing

[+] Author and Article Information
David H Diamond

Postdoctoral Fellow, Centre for Asset Integrity Management, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
dawie.diamond@up.ac.za

P.S. Heyns

Director, Centre for Asset Integrity Management, Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
stephan.heyns@up.ac.za

1Corresponding author.

ASME doi:10.1115/1.4039931 History: Received November 24, 2017; Revised March 29, 2018

Abstract

Blade Tip Timing is a non-contact method for measuring turbomachinery blade vibration. Proximity sensors are mounted circumferentially around the turbomachine casing and used to measure the tip displacements of blades during operation. Tip deflection data processing is non-trivial due to complications such as aliasing and high levels of noise. Specialized BTT algorithms have been developed to extract the utmost amount of information from the signals. The effectiveness of these algorithms is, however, influenced by the circumferential spacing between the proximity sensors. If the spacing is sub-optimal, an algorithm can fail to measure dangerous blade vibration. This article presents a novel optimization approach that determines the optimal spacing between proximity sensors.

Copyright (c) 2018 by ASME
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