Loose Bolt Detection by High Frequency Vibration Measurement with Non-Contact Laser Excitation
Loose Bolt Detection by High Frequency Vibration Measurement with Non-Contact Laser Excitation
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DOI：
10.1299/jsdd.5.1559
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
I. Kajiwara;D. Miyamoto;N. Hosoya;C. Nishidome
中科院分区：
文献类型：
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作者：
I. Kajiwara;D. Miyamoto;N. Hosoya;C. Nishidome
本文提出了一种基于激光烧蚀激励脉冲响应的振动测试与健康监测系统。高功率脉冲激光用来在结构表面产生理想的冲击力。在该系统中可以测量高频振动响应。利用该振动测试系统和损伤检测算法构建了健康监测系统。利用现有的健康监测系统，可以通过检测结构高频振动响应的波动来提取结构的微观损伤。在本研究中，螺栓紧固力矩的松动定义为系统的损坏。通过识别-田口方法对测量的频率响应数据进行统计评估，对损伤进行检测和识别。通过对安装在铝块结构上的螺栓松动的检测和识别实验，验证了该方法的有效性。
This paper proposes a vibration testing and health monitoring system based on an impulse response excited by a laser ablation. High power YAG pulse laser is used for producing an ideal impulse force on structural surface. It is possible to measure high frequency vibration responses in this system. A health monitoring system is constructed by this vibration testing system and a damage detecting algorithm. A microscopic damage of structures can be extracted by detecting fluctuations of high frequency vibration response with the present health monitoring system. In this study, loosening of bolt tightening torques is defined as the damage of the system. The damage is detected and identified by statistical evaluations of measured frequency response data with Recognition-Taguchi method. The effectiveness of the present approach is verified by experiment to detect and identify the loosening of bolts installed on an aluminum block structure.