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Journal of Intelligent Material Systems and Structures
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An Active Diagnostic System for Structural Health Monitoring of Rocket Engines

Xinlin P. Qing

Acellent Technologies Inc., 155 C-3 Moffett Park Drive, Sunnyvale, CA 94089, USA peter{at}acellent.com

Hian-Leng Chan

Shawn J. Beard

Amrita Kumar

Acellent Technologies Inc., 155 C-3 Moffett Park Drive, Sunnyvale, CA 94089, USA

An active diagnostic system using built-in piezoelectric actuator/sensor networks was developed for monitoring crack growth in a rocket engine pipe. The diagnostic system combines a sensor network, portable diagnostic hardware and data analysis software which allows for real-time in situ monitoring and long term tracking of the structural integrity of pressure vessels. Experimental data shows that the system can detect a surface crack as small as 4 mm and a through-crack as small as 2 mm in the high pressure engine pipe made of Inconel 718. It was found that the actuator-sensor paths that are most sensitive to crack growth are the ones in which the crack is growing away from, rather than towards the path. This discovery will provide important guidelines for the design of a sensor network for crack detection. It was also observed that the bending mode (equivalent to the A0 mode in plates) is more sensitive than the longitudinal mode (equivalent to the S0 mode in plates) to crack growth.

Key Words: structural health monitoring • sensor network • engine pipe • crack detection

Journal of Intelligent Material Systems and Structures, Vol. 17, No. 7, 619-628 (2006)
DOI: 10.1177/1045389X06059956
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X. P. Qing, S. J. Beard, A. Kumar, T. K. Ooi, and F.-K. Chang
Built-in Sensor Network for Structural Health Monitoring of Composite Structure
Journal of Intelligent Material Systems and Structures, January 1, 2007; 18(1): 39 - 49.
[Abstract] [PDF]