Error Outlier Detection Based Impact Monitoring Application on Light Aircraft’s Composite Wing
Abstract »Composite materials are widely being used for manufacturing various components of aircraft structure. However, composite materials are susceptible to barely visible impact damages (BVID), due to low velocity impact such as tool drop, runway debris, etc., which are difficult to detect through visual inspections. As a result, such damage degrades the structure property of the composite material and may lead to catastrophic failures. Therefore, BVID damages due to low velocity impacts are a major concern for composite structures. Continuous structural health monitoring (SHM) of the composite structure is needed to detect and localize impacts on the composite structure to ensure its safety and reliability. In this paper, impact detection and localization on composite wing is investigated using fiber Bragg grating (FBG) sensors and impact localization algorithm based on error outlier detection method. A high speed FBG interrogator is used to sample the impact response signals from the six FBG sensors, attached on the upper surface of the composite wing, at 100 kHz sampling frequency. Moreover, through the present study, application of impact localization based on error outlier detection on complex composite structure using FBG sensor is demonstrated.