Abstract
Extracting time-varying dynamic characteristics of an aerospace structure under thermal-vibration environment is difficult and complicated since the material properties of the structure fluctuate although the external load is constant. Initially, a composite plate model applied for time-varying system is updated based on finite strip method. Afterward, a thermal-vibration experimental system for realizing high-precision data measurement is designed, and the preliminary experiment certified the validity of experimental method. Finally, the time-varying dynamic characteristics of a typical thermal protective system plate is researched. Results show that the natural frequencies take a downward tendency with respect to heating time, and will undergo a dramatic decrease when the structure reaches the critical bulking temperature, while the damping characteristic shows an adverse trend. In addition, for certifying the applicability and accuracy of the updated model, comparisons between present model and recursive subspace method are conducted. The purpose of this paper is to provide some references on evaluating stability for aerospace structures under severe flight environment.
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The experimental data and matrix details used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
This research work reported in this paper was sponsored by the National Natural Science Foundation of China (52175220,52125209), the Natural Science Foundation of Jiangsu Province (BK20211558), the Key Research and Development Industry Foresight Program of Science and Technology Department of Jiangsu Province (BE2022158), and the Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX21_0084).
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Xue, C., Li, Y., Ma, H. et al. Extracting Time-Varying Dynamic Characteristics of a Typical TPS Plate via Thermal-Vibration Experiment. Exp Tech 48, 273–284 (2024). https://doi.org/10.1007/s40799-023-00654-0
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DOI: https://doi.org/10.1007/s40799-023-00654-0