| Citation: | HAO D，LIU J X，SU J，et al. Optimization of multilayer thermal insulation structure for high-speed aircraft considering material optimization[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（5）：1662-1672 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0261
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Thermal insulation structure is the key factor to ensure high-speed aircraft work safely and complete various tasks. The multilayer thermal insulation structure has attracted much attention because of its light weight and excellent thermal insulation effect. The performance of the multilayer thermal insulation structure is not only related to the physical size but also closely related to the material optimization and the temperature influence. In this paper, the transient nonlinear heat transfer model of the multilayer thermal insulation structure was established, and the numerical solution strategy of the heat transfer equation was proposed. Then, by considering the material optimization, introducing the temperature variation characteristic of the thermal conductivity of the material, and taking the geometric dimensions and equivalent mechanical properties of the multilayer thermal insulation structures as the optimization constraints, an integrated mechanical-thermal optimization model of the multilayer thermal insulation structure was established. The Monte-Carlo method and the particle swarm method were utilized to obtain the solution. The simulation results show that the proposed optimization model and method can reduce the structural mass by 27.4%. The temperature effect analysis shows that the temperature variation effect has an important influence on the optimization results. If the temperature effect on the material properties is not considered, the optimal design scheme may not meet the temperature design constraints, which further leads to structural failure. Finally, the reliability and rationality of the optimization scheme are verified by the finite element model. The optimization design method of the multilayer thermal insulation structure proposed in the paper provides technical support and lays a foundation for the overall design of high-speed aircraft.
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