Advanced Magnetic Barkhausen Noise for Residual Stress Measurement in Aircraft Landing Gear

用于飞机起落架残余应力测量的先进巴克豪森磁噪声

• 批准号: 543769-2019
• 负责人: Wowk, Diane
• 金额: $ 1.82万
• 依托单位: Royal Military College of Canada
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680234
• 关键词: Advanced; Magnetic; Barkhausen; Noise; Residual

Residual stress can lead to catastrophic failure of aircraft landing gear components. Currently, there is no reliable non-destructive inspection technology for residual stress measurement on in-service components without paint removal. X-Ray diffraction (XRD) requires both paint and metal plating removal, followed by etching of the base metal. Current Magnetic Barkhausen noise (MBN) technology only requires paint removal. However, while MBN has been employed to detect areas of high residual stress in aircraft landing gear using only a single measurement parameter, it has been found to be unreliable in its current form. Recent advances in control of the magnetic flux generated by the excitation field used to generate Barkhausen noise havedemonstrated a potential for improving measurement repeatability, as well as providing additional characterization of relative magnetic properties. Furthermore, development of mutually orthogonal field excitation has prospects to provide rapid evaluation of a component's anisotropic magnetic properties, which may be correlated with its stress state. Signal analysis techniques have also been advanced, including evaluation of MBN energy, Barkhausen noise envelope and pulse height distribution. Further development of MBN technology is required to identify and compensate for significant parameters that may affect measurement outcomes. Examples include effects of paint thickness variation, variability in compressive surface stress state induced by shot peening and the effects of plastic deformation in steel. Probe designoptimization is also required, in order to accommodate unique geometries, such as tight curvature radii. Advancement in the understanding and compensation for parameters that affect MBN signal generation is part of the proposed work. In addition, advanced MBN signal analysis methodology for residual stress measurement will be developed. Finite element modelling will be used for probe design and prediction of magnitude and direction of residual strain fields in plastically deformed aircraft landing gear. The proposed work is in collaboration with Safran Landing Systems Inc., located in Ajax Ontario that manufactures aircraft landing gear.

残余应力会导致飞机起落架部件的灾难性失效。目前还没有可靠的无损检测技术对在役部件进行不除漆的残余应力测量。x射线衍射（XRD）需要去除油漆和金属镀层，然后蚀刻母材。目前的磁巴克豪森噪声（MBN）技术只需要去除油漆。然而，虽然MBN已被用于检测飞机起落架高残余应力区域，但仅使用单一测量参数，其目前形式已被发现是不可靠的。最近在控制由产生巴克豪森噪声的激励场产生的磁通量方面取得的进展已经证明了提高测量可重复性的潜力，以及提供相对磁性质的额外表征。此外，互正交磁场激励的发展为快速评价元件的各向异性磁性提供了前景，这些各向异性磁性可能与元件的应力状态有关。信号分析技术也取得了进步，包括MBN能量评估、巴克豪森噪声包络和脉冲高度分布。需要进一步发展MBN技术来识别和补偿可能影响测量结果的重要参数。例子包括涂料厚度变化的影响，喷丸强化引起的表面压应力状态的变化以及钢的塑性变形的影响。探头设计优化也是必需的，以适应独特的几何形状，如紧曲率半径。提高对影响MBN信号产生的参数的理解和补偿是所提出工作的一部分。此外，还将开发用于残余应力测量的先进MBN信号分析方法。有限元建模将用于飞机起落架塑性变形残余应变场的探测设计和方向预测。拟议的工作是与赛峰着陆系统公司合作，该公司位于安大略省阿贾克斯，生产飞机起落架。