Probabilistic Analysis Methodology for Thermal Protection System during Conceptual Design
Publication: Journal of Aerospace Engineering
Volume 32, Issue 6
Abstract
This paper presents a probabilistic analysis methodology for a nonablative thermal protection system (TPS) of spacecraft at the conceptual design stage. The probabilistic analysis focuses on uncertainty characterization and uncertainty in failure prediction. TPS selection and sizing using sequential quadratic programming design optimization are first performed to provide the nominal values of the distribution parameters for uncertainty parameters such as the allowable temperature limits and thickness of TPS materials. Multi-input and multi-output support vector machines are utilized to approximate the thermal responses when failure modes are constructed, which dramatically reduces computational effort. Generalized subset simulation is used to estimate the failure probabilities at all nodes with a single simulation run, which further reduces the computational burden. The proposed methodology is applied to a lifting body vehicle model and a spacecraft model for conceptual design. Difficulties encountered and the performance of the method are investigated.
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Acknowledgments
The authors are grateful for the support of the National Natural Science Foundation of China (Project No. U1533109), funding from the Jiangsu Innovation Program for Graduate Education (Grant No. KYLX15_0243), and the Fundamental Research Funds for the Central Universities. The first two authors would like to acknowledge the support from the China Scholarship Council for their stay at overseas universities as visiting scholars (Yuanzhuo Ma at the Institute for Risk and Uncertainty at the University of Liverpool, Hong-Shuang Li in the Department of Mechanical and Aerospace Engineering at Missouri University of Science and Technology).
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©2019 American Society of Civil Engineers.
History
Received: Oct 25, 2018
Accepted: Mar 27, 2019
Published online: Jul 31, 2019
Published in print: Nov 1, 2019
Discussion open until: Dec 31, 2019
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