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To ensure the safety of use, it is necessary to locate the impact point. This paper investigates impact sensing and localization technology for composite plates and proposes a method of acoustic source localization for CFRP composite plates based on wave velocity-direction function fitting. This method divides the grid of composite plates, constructs the theoretical time difference matrix of the grid points, and compares it with the actual time difference to form an error matching matrix to localize the impact source. In this paper, finite element simulation combined with a lead-break experiment is used to explore the wave velocity-angle function relationship of Lamb waves in composite materials. The simulation experiment is used to verify the feasibility of the localization method, and the lead-break experimental system is built to locate the actual impact source. The results show that the acoustic emission time-difference approximation method can effectively solve the problem of impact source localization in composite structures, and the average localization error is 1.44 cm and the maximum localization error is 3.35 cm in 49 experimental points with good stability and accuracy.<\/jats:p>","DOI":"10.3390\/s23063052","type":"journal-article","created":{"date-parts":[[2023,3,13]],"date-time":"2023-03-13T03:28:33Z","timestamp":1678678113000},"page":"3052","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Acoustic Source Localization in CFRP Composite Plate Based on Wave Velocity-Direction Function Fitting"],"prefix":"10.3390","volume":"23","author":[{"given":"Yu","family":"Zhang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Feng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaobo","family":"Rui","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lixin","family":"Xu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, Tianjin 300072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Qi","sequence":"additional","affiliation":[{"name":"Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3923-9911","authenticated-orcid":false,"given":"Zi","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Brown University, Providence, RI 02912, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cong","family":"Hu","sequence":"additional","affiliation":[{"name":"Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of Electronic Technology, Guilin 541004, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Liu","sequence":"additional","affiliation":[{"name":"Tianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin 300450, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haijiang","family":"Zhang","sequence":"additional","affiliation":[{"name":"China Academy of Space Technology, Beijing 100094, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,12]]},"reference":[{"key":"ref_1","first-page":"100962","article-title":"Additively manufactured carbon fiber-reinforced composites: State of the art and perspective","volume":"31","author":"Tekinalp","year":"2019","journal-title":"Addit. 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