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首页> 外文期刊>Mechanical systems and signal processing >Application of fibre optic sensing systems to measure rotor blade structural dynamics
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Application of fibre optic sensing systems to measure rotor blade structural dynamics

机译：光纤传感系统测量转子叶片结构动力学的应用

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摘要

This 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.
机译：本文比较了两种用于振动表征的光纤传感技术：（a）光纤布拉格光栅（FBG）应变仪和（b）一种基于多纤维内的微分干涉菌株测量的新型直接光纤形状传感（DFOSS）方法相同的纤维布置。在受控实验室环境中进行的一系列地面振动试验期间获得了空中客车直升机H135无轴承主转子叶片（5.1M半径）的操作模式形状和频率测量。使用市售的加速度计验证光纤仪表系统记录的数据，并与基线有限元模型进行比较。两种光纤传感系统都证明了能够识别诸频率范围（0-100Hz）的刀片的自然频率。来自FBG传感器的数据表现出对它们相对于刀片的中性轴的位置的依赖性，这意味着凸起和滞后模式的完全表征需要仔细考虑在赤道方向上的传感器位置。尽管其对角度变化的敏感性，而不是应变，但DFOSS系统能够识别所有结构动态，尽管它位于滞后方向上的中性轴上，而不是应变，以及其双轴测量能力。 DFOSS系统还允许直接确定刀片的操作模式形状，而不需要从刀片到传感器的应变传输并且没有基础结构模型的要求。评估获得的固有频率和操作模式形状的准确性，证明了使用用于确定刀片结构动态的光纤感测系统的使用。

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  • 来源
    《Mechanical systems and signal processing》 |2021年第9期|107758.1-107758.17|共17页
  • 作者

    Simone Weber; Thomas Kissinger; Edmond Chehura; Stephen Staines; James Barrington; Kevin Mullaney; Luca Zanotti Fragonara; Ivan Petrunin; Stephen James; Mudassir Lone; Ralph Tatam;

  • 作者单位

    Airbus Helicopters UK Ltd. 128 Longford Ln Kidlington 0X5 1QZ United Kingdom Cranfield University Centre for Aeronautics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Engineering Photonics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Engineering Photonics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Engineering Photonics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Engineering Photonics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Engineering Photonics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Autonomous and Cyberphysical Systems Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Autonomous and Cyberphysical Systems Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Engineering Photonics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Aeronautics Cranfield MK43 0AL United Kingdom;

    Cranfield University Centre for Engineering Photonics Cranfield MK43 0AL United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Bearingless main rotor blade; Fibre Bragg gratings; Shape measurement;

    机译：无轴承主转子叶片;纤维布拉格光栅;形状测量;

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