Abstract
This investigation concerns the application of different techniques, including optical fibre strain sensing, pulsed Digital Speckle Pattern Interferometry (DSPI), traditional modal analysis and finite element modelling to the study of vibrating composite structures. A prototype system for condition monitoring of composite structures is being developed which relies on the on-line measurement of dynamic strains in order to detect any deterioration in performance due to the accumulation of damage. A range of carbon-fibre reinforced composite specimens that incorporate innovative Fabry-Perot interferometric long gauge-length strain sensors have been produced and tested. The optimal design of fibre sensor network configurations for the identification of different damage parameters is being aided through the development of a software simulation tool and the use of a p-version FEM package. Vibration modes of the excited structures have also been determined using an out-of-plane pulsed-DSPI system, employing a dual-cavity frequency-doubled Nd:YAG pulsed laser with a 25 Hz repetition rate. In general, experimental results compare favourably with finite element predictions. The data derived from the strain sensors is used to update a parameterised FE model of the composite structure, allowing the determination of the position and extent of damage present.
| Original language | English |
|---|---|
| Pages (from-to) | 129-137 |
| Number of pages | 9 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 4694 |
| DOIs | |
| Publication status | Published - 2002 |
| Event | Smart Structures and Materials 2002 Smart Sensor Technology and Measurement Systems - San Diego, CA, United States Duration: 18 Mar 2002 → 19 Mar 2002 |
Keywords
- Finite element model updating
- Interferometric sensors
- Strain modal analysis