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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (8): 225659.doi: 10.7527/S1000-6893.2021.25659

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Experimental method of guided wave monitoring for high temperature airflow damage of C/C thermal protection structures

ZHENG Hui, QIU Lei, YUAN Shenfang, YANG Xiaofei, LU Xulong, XUE Zhaopeng   

  1. Research Center of Structural Health Monitoring and Prognosis, State Key Lab of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2021-04-12 Revised:2022-01-05 Online:2022-08-15 Published:2022-01-04
  • Supported by:
    Natural Science Foundation of China (51921003,51975292),Outstanding Youth Foundation of Jiangsu Province of China (BK20211519),Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and Astronautics)(MCMS-I-0521K01),the Fundamental Research Funds for the Central Universities (1001-XAC21022),Priority Academic Program Development of Jiangsu Higher Education Institutions of China

Abstract: The health monitoring of Thermal Protection Structures (TPS) is essential for the safe service and efficient maintenance of hypersonic vehicles. The guided wave based Structural Health Monitoring (SHM) method is a promising method for SHM of hypersonic vehicles, due to its advantages, such as high sensitivity and large monitoring area based on piezoelectric sensor network. However, there are few relevant researches on guided wave monitoring methods for hypersonic vehicles TPS at home and abroad, especially on the experimental and monitoring method for the high-temperature airflow damage on TPS. To solve this problem, an experimental method based on guided waves for the real damage monitoring of hypersonic vehicles TPS is proposed. Through taking the carbon / carbon (C/C) composite TPS as the research object and applying real damage onto it via a high-temperature oxygen-acetylene gas flow above 1 800 ℃, the propagation characteristics of guided wave on TPS are studied. The influence of damage on guided waves is analyzed in terms of the comparison of the signal and characteristic parameters of guided waves before and after damage and the characterization of the damage degree. The results show that the amplitude and propagation velocity of the guided wave change significantly after the damage occurred. By quantifying the change of the guide wave signals before and after damage, the damage degree of TPS can be good indicated, which verifies that the guided wave monitoring method is feasible for monitoring TPS damage and its expansion, providing an experimental method and basis for further research on the guided wave monitoring theory and method of hypersonic vehicles TPS.

Key words: hypersonic vehicle, thermal protection structures, carbon / carbon, structural health monitoring, guided wave, oxygen-acetylene ablation

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