The Analysis Of Synchronous Blade Vibration Using Linear Sine Fitting

Open access

Abstract

In Blade Tip Timing several sensors installed circumferentially in the casing are used to record times of arrival (TOA) and observe deflections of blade tips. This paper aims to demonstrate methodology of model-based processing of aliased data. It focuses on the blade vibration excited by the forces synchronous with engine rotation, which are called integral responses. The driven harmonic oscillator with single degree of freedom (SDOF) is used to analyse blade vibration measured by tip-timing sensors during engine deceleration. When integral engine order EO is known, the linear sine fitting techniques can be used to process data from sensors to estimate amplitude, phase and frequency of blade vibration in each rotation. The oscillator model is implemented in MATLAB and used to generate resonance curves and simulate blade responses observed with tip sensors, installed in the axial compressor. Generated TOA data are fitted to the sine function to estimate vibration parameters. The validated procedure is then employed to analyze real test data.

[1] Grant K. Experimental Testing Of Some Tip-Timing Techniques, 1st Evi-GTI Conference, Barcelona, 2004.

[2] Heath S. Imregun M. An improved single-parameter tip-timing method for turbo-machinery blade vibration measurements using optical laser probes, International Journal of Mechanical Sciences, Vol. 38, №10, 1996, 1047–1058.

[3] Heath S. A new technique for identifying synchronous resonances using tip-timing. ASME Journal of Engineering for Gas Turbines and Power. Vol. 122, No. 2. April 2000, 219-225.

[4] Heath S. Identification of resonant frequencies of vibration of rotating blades, US Patent 5,974,882, 1999.

[5] Jousselin O. Russhard P. A method for establishing the uncertainty levels for aero-engine blade tip amplitudes extracted from blade tip timing data, 10th International Conference on Vibrations in Rotating Machinery - IMECHE, London, 2012.

[6] Kaźmierczak K., Przysowa R. Standard Sine Fitting Algorithms Applied to Blade Tip Timing Data, Journal of Konbin, 2/2014.

[7] Kucher O.G. Kharton V.V. Laine J.P. Thouverez F. Criteria of Discrete Phase Control of Blade Working Condition, Aerospace Engineering and Technology, No 7(64), 2009.

[8] Osburn N. G. Implementation of a two probe tip-timing technique to determine compressor blade vibrations, Naval Postgraduate School Monterey CA, 2000.

[9] Overview of Curve Fitting Models and Methods in LabVIEW. National Instruments Tutorial. www.ni.com, 2009

[10] Russhard P. Blade Tip Timing – Frequently asked Questions, 57th ISA International Instrumentation Symposium (IIS) -Tip Timing Workshop, 2012.

[11] Russhard P. Method for analysing vibration in rotor blades, EP 2 136 189 B1 patent, 2009.

[12] Russhard P. Rotating blade analysis, GB2491632B patent, 2012.

[13] Russhard P. BTT Data Zeroing Techniques, MFPT and ISA’s 59th International Instrumentation Symposium, 2013.

[14] Zablotskiy I., Korostelev Yu. Measurement of Resonance Vibrations of Turbine Blades With Elura Device, FTD-ID(RS)T-0861-78 (Originally published in Energomashinostroneniye, Nr. 2, February 1970)

[15] Zablotskiy I. Korostelev Yu. Sviblov L.B. Contactless Measuring of Vibrations in the Rotor Blades of Turbines, FTD AD-780 365-72 (Originally published as Beskontaktnye izmerenia kolebanij lopatok turbomaszin. Maszinostrojenije. Moskwa 1977).

[16] Zielinski M. Noncontact Blade Vibration and Tip Clearance Measurement on Aero Engine Comressors with BSSM, Tip-Timing and Tip-Clearance Problems in Turbomachinery, Von Karman Institute, 2007.

Journal of KONBiN

The Journal of Air Force Institute of Technology

Journal Information


CiteScore 2017: 0.21

SCImago Journal Rank (SJR) 2017: 0.163
Source Normalized Impact per Paper (SNIP) 2017: 0.320

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 135 135 9
PDF Downloads 53 53 6