Application of fibre optic sensing systems to measure rotor blade structural dynamics

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dc.contributor.authorWeber, Simone
dc.contributor.authorKissinger, Thomas
dc.contributor.authorChehura, Edmond
dc.contributor.authorStaines, Stephen
dc.contributor.authorBarrington, James
dc.contributor.authorMullaney, Kevin
dc.contributor.authorFragonara, Luca Zanotti
dc.contributor.authorPetrunin, Ivan
dc.contributor.authorJames, Stephen
dc.contributor.authorLone, Mudassir
dc.contributor.authorTatam, Ralph P.
dc.date.accessioned2021-03-17T10:49:41Z
dc.date.available2021-03-17T10:49:41Z
dc.date.issued2021-03-09
dc.description.abstractThis paper compares two fibre optic sensing techniques for vibration characterisation: (a) optical fibre Bragg grating (FBG) strain gauges and (b) a novel direct fibre optic shape sensing (DFOSS) approach based on differential interferometric strain measurements between multiple fibres within the same fibre arrangement. Operational mode shapes and frequency measurements of an Airbus Helicopters H135 bearingless main rotor blade (5.1 m radius) were acquired during a series of ground vibration tests undertaken in a controlled laboratory environment. Data recorded by the fibre optic instrumentation systems were validated using commercially available accelerometers and compared against a baseline finite element model. Both fibre optic sensing systems proved capable of identifying the natural frequencies of the blade in the frequency range of interest (0–100 Hz). The data from the FBG sensors exhibited a dependency on their position relative to the neutral axes of the blade, which meant that full characterisation of the flapping and lagging modes required careful consideration of sensor location in the chordwise direction. The DFOSS system was able to identify all structural dynamics, despite being located on the neutral axis in the lagging direction, due to its sensitivity to angle changes, rather than strain, and its biaxial measurement capability. The DFOSS system also allowed the operational mode shapes of the blade to be determined directly, without the requirement for strain transfer from the blade to the sensor and without the requirement for a model of the underlying structure. The accuracy of obtained natural frequencies and operational mode shapes is assessed, demonstrating the potential of the use of both fibre optic sensing systems for determining blade structural dynamics.en_UK
dc.identifier.citationWeber S, Kissinger T, Chehura E, et al., (2021) Application of fibre optic sensing systems to measure rotor blade structural dynamics. Mechanical Systems and Signal Processing, Volume 158, September 2021, Article number 107758en_UK
dc.identifier.issn0888-3270
dc.identifier.urihttps://doi.org/10.1016/j.ymssp.2021.107758
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16482
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectshape measurementen_UK
dc.subjectbre Bragg gratingsen_UK
dc.subjectbearingless main rotor bladeen_UK
dc.titleApplication of fibre optic sensing systems to measure rotor blade structural dynamicsen_UK
dc.typeArticleen_UK

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