کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
559405 1451877 2013 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bolt loosening analysis and diagnosis by non-contact laser excitation vibration tests
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر پردازش سیگنال
پیش نمایش صفحه اول مقاله
Bolt loosening analysis and diagnosis by non-contact laser excitation vibration tests
چکیده انگلیسی


• Finite element modeling of bolted structures is proposed to evaluate dynamic characteristics.
• Characteristic change in frequency response due to bolt loosening exists at high frequency.
• Laser excitation achieves high reproducibility and reliability of input force.
• Laser excitation approach could be a novel technology to detect bolt loosening.

In this paper, a vibration testing and health monitoring system based on an impulse response excited by laser ablation is proposed to detect bolted joint loosening. A high power Nd: YAG pulse laser is used to generate an ideal impulse on a structural surface which offers the potential to measure high frequency vibration responses on the structure. A health monitoring apparatus is developed with this vibration testing system and a damage detecting algorithm. The joint loosening can be estimated by detecting fluctuations of the high frequency response with the health monitoring system. Additionally, a finite element model of bolted joints is proposed by using three-dimensional elements with a pretension force applied and with contact between components taken into account to support the bolt loosening detection method. Frequency responses obtained from the finite element analysis and the experiments using the laser excitation are in good agreement. The bolt loosening can be detected and identified by introducing a damage index by statistical evaluations of the frequency response data using the Recognition-Taguchi method. The effectiveness of the present approach is verified by simulations and experimental results, which are able to detect and identify loose bolt positions in a six-bolt joint cantilever.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanical Systems and Signal Processing - Volume 40, Issue 2, November 2013, Pages 589–604
نویسندگان
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