Bolt looseness localization with connection-stiffness-varying flange

IF 3.7 3区材料科学 Q1 INSTRUMENTS & INSTRUMENTATION

Smart Materials and Structures Pub Date : 2024-07-24 DOI:10.1088/1361-665x/ad6725

Hao Huang, Qingbo He

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引用次数: 0

Abstract

Electromechanical impedance analysis is a traditional method to identify the occurrence of bolt looseness, but accurate localization of blot looseness is hard to realize on the flange. In this study, a flange model with bolt connection stiffness varying with position is proposed. The location of bolt looseness can be then determined from the impedance spectrum of the model since the uniformity and symmetry of the flange are broken. The analytic model is established to reveal the distinguishability of the eigenfrequency shifting characteristics when the connection stiffness at different positions changes. The frequency shifting sequence is extracted from the coupling impedance spectrum as a feature, and the correlation between the sequences corresponding to bolt looseness at different positions is low. The relationship between the sequence and the degree of looseness is highly related so that the unknown degree of looseness can be matched with the calibrated sequence to realize the localization of the looseness. Based on the distinguishability of the frequency shifting sequence, the connection-stiffness-varying model shows great potential in the field of flanges or other connecting structures for structural health monitoring and damage localization.

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螺栓松动定位与连接刚度变化的法兰

机电阻抗分析是识别螺栓松动的一种传统方法，但在法兰上很难实现斑点松动的精确定位。本研究提出了一种螺栓连接刚度随位置变化的法兰模型。由于法兰的均匀性和对称性被打破，因此可以通过模型的阻抗谱来确定螺栓松动的位置。建立分析模型以揭示不同位置的连接刚度变化时特征频率移动特性的可区分性。从耦合阻抗频谱中提取频率偏移序列作为特征，不同位置螺栓松动对应的序列之间相关性较低。该序列与松动程度之间的关系高度相关，因此可以将未知的松动程度与校准序列进行匹配，从而实现松动的定位。基于频移序列的可区分性，连接-刚度-变化模型在法兰或其他连接结构的结构健康监测和损伤定位领域显示出巨大的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Smart Materials and Structures 工程技术-材料科学：综合

CiteScore

7.50

自引率

12.20%

发文量

317

审稿时长

3 months

期刊介绍： Smart Materials and Structures (SMS) is a multi-disciplinary engineering journal that explores the creation and utilization of novel forms of transduction. It is a leading journal in the area of smart materials and structures, publishing the most important results from different regions of the world, largely from Asia, Europe and North America. The results may be as disparate as the development of new materials and active composite systems, derived using theoretical predictions to complex structural systems, which generate new capabilities by incorporating enabling new smart material transducers. The theoretical predictions are usually accompanied with experimental verification, characterizing the performance of new structures and devices. These systems are examined from the nanoscale to the macroscopic. SMS has a Board of Associate Editors who are specialists in a multitude of areas, ensuring that reviews are fast, fair and performed by experts in all sub-disciplines of smart materials, systems and structures. A smart material is defined as any material that is capable of being controlled such that its response and properties change under a stimulus. A smart structure or system is capable of reacting to stimuli or the environment in a prescribed manner. SMS is committed to understanding, expanding and dissemination of knowledge in this subject matter.