摘要
螺栓连接广泛应用于航空航天、机械和土木工程中,其失效会严重影响系统可靠性与安全性。因此,螺栓预紧力的在线监测至关重要。超声导波因穿透性强、传播距离远、检测灵敏度高,被广泛用于螺栓监测,但导波与螺栓连接界面相互作用机制尚不清晰。为此,建立二维频域有限元模型,通过扫频分析验证模型准确性,并研究不同激励频率下A0和S0模态的最优激发频率。仿真结果表明,导波与连接界面作用时发生模态转换,各模态能量传输系数随接触长度呈周期性变化。当激励频率为255 kHz时,A0模态对接触长度变化更敏感,适用于早期松动检测;当频率为345 kHz时,S0模态周期更长,适合螺栓从紧固到完全松动的全过程监测。
Bolt connections are widely used in aerospace,mechanical,and civil engineering,and their fail⁃ure can significantly impact system reliability and safety.Therefore,online monitoring of bolt preload is crucial.Due to their strong penetration ability,long propagation distance,and high detection sensitivity,ultrasonic guided waves are widely applied in bolt monitoring.However,the interaction mechanism between guided waves and bolt connection interfaces remains unclear.To address this issue,a twodimensional frequency-domain finite element model is developed and its accuracy is validated through fre⁃quency sweep analysis,and the optimal excitation frequencies is studied for A0 and S0 modes under differ⁃ent excitation frequencies.Simulation results show that guided waves undergo mode conversion when interacting with the connection interface,and the energy transmission coefficients of each mode exhibit periodic changes with contact length.At an excitation frequency of 255 kHz,the A0 mode is more sensi⁃tive to changes in contact length,suggesting that it is suitable for early looseness detection.At 345 kHz,the S0 mode exhibits a longer periodicity,demostrating that it is more suitable for monitoring the entire process from tightening to complete loosening.
作者
董晗
李佳鑫
史维佳
赵勃
杨彬
谭久彬
DONG Han;LI Jiaxin;SHI Weijia;ZHAO Bo;YANG Bin;TAN Jiubin(Institute of Precision Acoustooptic Instrument,Harbin Institute of Technology,Harbin 150080,China;Center of Ultra-Precision Optoelectronic Instrument Engineering,Harbin Institute of Technology,Harbin 150080,China;Key Lab of Ultra-Precision Intelligent Instrumentation,Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150080,China)
出处
《测试技术学报》
2026年第1期10-16,共7页
Journal of Test and Measurement Technology
基金
国家自然科学基金资助项目(2022YFB3403904)。
关键词
超声导波
传输系数
螺栓连接
有限元仿真
结构健康监测
ultrasonic guided wave
transmission coefficient
bolted connection
finite element simula⁃tion
structural health monitoring
