基于 PRSEUS 结构的翼身融合民机中央机体球亏面框优化设计方法

The Blended Wing Body（BWB）layout is an unconventional subsonic transport aircraft configuration. To address the design challenges of the aft pressure frame in this layout，this paper conducts optimization design work on the central fuselage circumferential frame using NASA’s proposed Pultruded Rod Stitched Efficient Unitized Structure （PRSEUS）concept. Finite element models are separately established for a certain type of BWB aircraft's aluminum flat frame and the PRSEUS pherical deficient surfaces frame. Numerical simulations and comparisons reveal that the PRSEUS pherical deficient surfaces frame exhibits superior load-bearing performance and lower structural weight. Building upon this，the paper performs further sensitivity analysis on the PRSEUS pherical deficient surfaces frame，identifying influential parameters related to its static strength and stability，and summarizing the impact patterns. By analyzing the effects of key parameters in the collaborative optimization process，a synergy optimization strategy based on surrogate models is developed，known for its strong applicability and high efficiency. Employing this collaborative optimization approach，the paper optimizes the dimensions of the PRSEUS pherical deficient surfaces frame. Through a thorough optimality analysis of the results，an optimized solution that balances static strength and stability is achieved，reducing the weight of the PRSEUS pherical deficient surfaces frame by 10. 6%. The designed PRSEUS pherical deficient surfaces frame excels in load-carrying efficiency and stability，whichoffers valuable insights to designers and researchers in related fields.