Radome health management based on synthesized impact detection,laser ultrasonic spectral imaging,and wavelet-transformed ultrasonic propagation imaging methods |
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| Affiliation: | 1. Department of Aerospace Engineering and LANL-CBNU Engineering Institute Korea, Chonbuk National University, Jeonju, Jeonbuk 561-756, South Korea;2. Aeronautical Technology Directorate, Agency for Defense Development, Daejeon 305-600, South Korea;1. Department of Mechanical Engineering, American University of Beirut, Lebanon;2. Laboratory of Smart Materials and Structures, Centre for Advanced Materials Technology, School of Aerospace, Mechanical and Mechatronic Engineering, the University of Sydney, NSW 2006, Australia;3. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. DATA61, CSIRO, Level 5, 13 Garden Street, Eveleigh, NSW, Australia;1. Department of Mechanical Engineering, College of Science and Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga 525-8577, Japan;2. Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8540, Japan;1. Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Republic of Korea;2. X-NDT Inc., Republic of Korea;3. Aeronautical Technology Directorate, Agency for Defense Development, Republic of Korea;4. LANL-CBNU Engineering Institute-Korea, Chonbuk National University, Republic of Korea;5. The Engineering Institute, Los Alamos National Laboratory, United States |
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| Abstract: | A radome must not only withstand various forces during operation, but also provide a window for electromagnetic signals. A radome is generally a composite sandwich structure. Much of the damage to radomes is barely visible to the naked eye on the outer surface, but is severe internally. In this study, a radome health management strategy consisting of in-flight damage event detection and ground damage evaluation processes is proposed. A radome health management system, composed of an on-board subsystem and a ground subsystem, was developed to realize the strategy. An in-flight event detection system was developed based on acoustic emission (AE) technology. A built-in amplifier-integrated PZT sensor was used, and the minimum impact energy that the on-board subsystem can detect was determined. The AE sensor was then switched to an ultrasonic receiver. A scanning laser ultrasonic technology was combined with the ultrasonic receiver to develop a ground nondestructive evaluation subsystem. For in situ damage visualization, laser ultrasonic frequency tomography and wavelet-transformed ultrasonic propagation imaging algorithms were developed in this study. To demonstrate the robustness of the ground subsystem, a damage was generated by 5.42 J impact in a glass/epoxy radome with honeycomb core, and the impact image of 25 mm in diameter invisible outside could be visualized with the combination of ultrasonic spectral imaging (USI) and wavelet-transformed ultrasonic propagation imaging (WUPI), which made the propagation of only the damage-related ultrasonic modes visible. |
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