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Proceedings Paper

A new diagnostic method of bolt loosening detection for thermal protection systems
Author(s): Weihua Xie; Songhe Meng; Jiecai Han; Shanyi Du; Boming Zhang; Dong Yu
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Paper Abstract

Research and development efforts are underway to provide structural health monitoring systems to ensure the integrity of thermal protection system (TPS). An improved analytical method was proposed to assess the fastener integrity of a bolted structure in this paper. A new unsymmetrical washer was designed and fabricated, taking full advantage of piezoelectric ceramics (PZT) to play both roles as actuators and sensors, and using energy as the only extracted feature to identify abnormality. This diagnostic method is not restricted by the materials of the bracket, panel and base structure of the TPS whose condition is under inspection. A series of experiments on a metallic honeycomb sandwich panel were completed to demonstrate the capability of detecting bolt loosening on the TPS structure. Studies showed that this method can be used not only to identify the location of loosened bolts rapidly, but also to estimate the torque level of loosening bolts. Since that energy is the only extracted feature used to detect bolt loosening in this method, the diagnostic process become very simple and swift without sacrificing the accuracy of the results.

Paper Details

Date Published: 20 October 2009
PDF: 9 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 749334 (20 October 2009); doi: 10.1117/12.843778
Show Author Affiliations
Weihua Xie, Harbin Institute of Technology (China)
Songhe Meng, Harbin Institute of Technology (China)
Jiecai Han, Harbin Institute of Technology (China)
Shanyi Du, Harbin Institute of Technology (China)
Boming Zhang, Harbin Institute of Technology (China)
Dong Yu, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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