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Problem statement: Most exhaustive NDT techniques require large capital equipment, are difficult to apply to complex geometric structures and, above all, are time-consuming to use and some take a considerable time to complete. As a solution to the problems associated with NDT applications, there is a need to establish an intelligent analysis system that supports a portable testing environment, which allows various types of inputs and provides sufficient data regarding damage severity in the tested structure. Approach: This research investigated possible fast NDT systems and algorithms and provides a novel approach that allows engineers and researchers to pinpoint defects in real time. The system was based on incident signals on a composite surface being detected and analyzed. Any damage in the composite causes a change in the detected signal. The proposed technique is suitable for high volume monitoring and inspection of safety critical components non-destructively. It unified through conversion the extracted information from irrelevant background using the developed Classification Algorithm with the ability to correlate obtained data to level of damage and it is effect on the structure overall performance. Results: The feasibility of using time measurements to establish the integrity of RIM composites using a handheld, low frequency, electronic tapping device has been studied. The relationship between damage and component thickness had also been established. Conclusion: A mathematical model describing the composite time response and its relation to both level of damage and tensile strength was presented. An excellent agreement between the model and the testing data was observed. Also the credibility of the measuring device and its promising future as a cheap on line NDT testing instrument was proved

Modified Center Interpolation Net for Classification of Composite Structures Tested Using Low Frequency Electronic Tapping