徐浩

个人信息Personal Information

副教授

博士生导师

硕士生导师

性别:男

毕业院校:香港理工大学

学位:博士

所在单位:材料科学与工程学院

学科:计算力学. 航空航天力学与工程. 飞行器设计. 材料物理与化学. 高分子材料

办公地点:大连理工大学综合实验一号楼411A

联系方式:xuhao@dlut.edu.cn

电子邮箱:xuhao@dlut.edu.cn

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Vibro-acoustic modulation (VAM)-inspired structural integrity monitoring and its applications to bolted composite joints

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论文类型:期刊论文

发表时间:2017-09-15

发表刊物:COMPOSITE STRUCTURES

收录刊物:SCIE、EI、Scopus

卷号:176

页面范围:505-515

ISSN号:0263-8223

关键字:Composite bolted joint; Bolt loosening; Vibro-acoustic modulation; Contact acoustic nonlinearity; Structural health monitoring

摘要:Vibro-acoustic modulation (VAM) - one of the prevailing nonlinear methods for material characterization and structural damage evaluation - is based on the effect of modulation of a low-frequency vibration (pumping vibration) on a high-frequency acoustic wave (probing wave). In this study, the contact acoustic nonlinearity (CAN), associated with changes in the solid-solid interface of a bolted joint under VAM, due to bolt loosening, is explored analytically and experimentally, on which basis a VAM-inspired approach is developed for monitoring structural integrity of bolted joints. Numerical simulation based on a theoretical model with structural nonlinear contact stiffness is implemented, to achieve insight into CAN induced by a loose bolt. A quantitative correlation between vibro-acoustic nonlinear distortion and degree of bolt loosening is ascertained. The developed approach is applied to detect bolt loosening in a composite bolted joint and to evaluate the residual torque of the loose bolt quantitatively. Take a step further, the VAM-based nonlinear approach is compared against an elastic wave-based linear method, underscoring a higher sensitivity to bolt loosening. From early awareness of bolt loosening to continuous evaluation of the bolt loosening progress, this VAM-based approach has provided a cost-effective framework for monitoring the health and integrity of a composite bolted joint. (C) 2017 Elsevier Ltd. All rights reserved.