螺栓连接
结构工程
非线性系统
刚度
振动
工程类
残余物
复合数
结构健康监测
失真(音乐)
材料科学
计算机科学
有限元法
声学
接头(建筑物)
复合材料
电子工程
量子力学
CMOS芯片
物理
算法
放大器
作者
Zhen Zhang,Hao Xu,Yaozhong Liao,Zhongqing Su,Yi Xiao
标识
DOI:10.1016/j.compstruct.2017.05.043
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI