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Extracting Time-Varying Dynamic Characteristics of a Typical TPS Plate via Thermal-Vibration Experiment.

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Title: Extracting Time-Varying Dynamic Characteristics of a Typical TPS Plate via Thermal-Vibration Experiment.
Authors: Xue, C.1,2 (AUTHOR), Li, Y.1,2 (AUTHOR) LYB@seu.edu.cn, Ma, H.1,2 (AUTHOR), Fei, Q.1,2 (AUTHOR) qgfei@seu.edu.cn
Source: Experimental Techniques. Apr2024, Vol. 48 Issue 2, p273-284. 12p.
Subjects: Finite strip method, Composite plates, Structural stability, Critical temperature, Time-varying systems
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. [ABSTRACT FROM AUTHOR]
Copyright of Experimental Techniques is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Finite+strip+method%22">Finite strip method</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+plates%22">Composite plates</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+stability%22">Structural stability</searchLink><br /><searchLink fieldCode="DE" term="%22Critical+temperature%22">Critical temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Time-varying+systems%22">Time-varying systems</searchLink>
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  Data: 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Experimental Techniques is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s40799-023-00654-0
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        Text: English
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        Type: general
      – SubjectFull: Composite plates
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      – SubjectFull: Structural stability
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      – SubjectFull: Critical temperature
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              Text: Apr2024
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