Abstract
In this paper, a node detection method is proposed to detect the damaged parts of armor automatically. The traditional detection of armor damage is judged by experience first, and then the parts are decomposed and confirmed, which makes the problem solving time long and efficiency low. In this paper, the in-mold electronic decoration technology is used on the surface of armor, and the node displacement changes after the surface film is damaged are used to achieve the purpose of damage detection. By using the wavelet analysis, the singularity of the wavelet function can be found and the damaged part can be determined. The Lipschitz index can be used to judge the singularity of the wavelet function to detect the local damage on the armor surface. Finally, the changes of Lipschitz index of the signal with different damage degrees on the helmet deck were simulated. In terms of influencing factors of optimization process, moldex3D was used to simulate and analyze the damaged parts of armor—different injection molding parameter schemes were set to optimize the armor film. In the first stage, the displacement change at the damaged location is detected by the probe node through simulation. In the second stage, the armor was simulated by setting appropriate process parameters such as melt temperature, filling time, filling pressure, and filling time. In the third stage, the wavelet analysis and a Lipschitz index were used to detect the location of damaged nodes. In the fourth stage, the change curve of wavelet analysis is verified by the analysis experiment. Through the experimental verification, it can be seen that the position displacement of the damaged armor changes and the singularity is generated on the wavelet function to achieve the purpose of damage detection. The influencing factors of the film injection molding are temperature and pressure. Through the simulation analysis, we optimize the injection molding parameters of the film, thus improving the damage resistance of the armor. Finally, the optimal parameters of vulnerable parts are obtained and the optimization scheme is determined.
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Acknowledgements
This research was supported by CoreTech System Co., Ltd. (Moldex3D) and Yizumi Precision Machinery Co., Ltd., which are gratefully acknowledged.
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Hanjui Chang did conceptualization. Guangyi Zhang curated the data. Shuzhou Lu is responsible for methodology. Yue Sun is assigned to project administration. Hanjui Chang did writing—original draft. All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Chang, H., Sun, Y., Lu, S. et al. Based on wavelet-Lipschitz function for node detection method on armor subsequent damage optimization. Int J Adv Manuf Technol 127, 4163–4180 (2023). https://doi.org/10.1007/s00170-023-11734-1
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DOI: https://doi.org/10.1007/s00170-023-11734-1