关键词: 高超声速飞行器结构, 多学科耦合, 双层序贯算法, 可靠性优化

Abstract: The structure of hypersonic aircraft operates in a complex service environment. During the structural design process, employing a multi-disciplinary fine optimization design method that considers multi-field coupling, which can ensure the superior performance and reliability of the aircraft structure under various complex operating conditions. Targeting the issues of low efficiency and convergence challenges associated with traditional multi-disciplinary optimization algorithms and reliability optimization algorithms, this paper proposes a double-layer sequential optimization algorithm designed specifically for multi-disciplinary reliability optimization of aircraft structures. By decomposing the multi-disciplinary optimization into a primary optimization problem and several subordinate optimization problems associated with individual constraints, the algorithm achieves decoupling of the constraints within the multi-disciplinary optimization framework. This approach not only enhances optimization efficiency but also significantly mitigates the substantial computational cost incurred by multi-disciplinary coupling analysis during the design optimization process. Subsequently, reliability optimization is performed on the multidisciplinary optimal design points. By employing a double-layer nesting method, deterministic optimization is decoupled from reliability analysis, thereby significantly enhancing the efficiency of reliability optimization. The two-layer sequential optimization algorithm extends multidisciplinary optimization to the realm of aircraft structural reliability optimization. This approach not only expedites the optimization process but also significantly enhances the practicality and efficacy of the design. Taking the optimization of hypersonic airfoil structures as a case study, the proposed method's validity is confirmed, thereby enhancing the efficiency of multidisciplinary reliability-based optimization design for aircraft structures.

Key words: Hypersonic aircraft structure, Multidisciplinary coupling, Two-layer sequential optimization algorithm, Reliability-based optimization