Research on multi-objective optimization design method of pressurized cabin for civil high-speed rotorcraft based on collaborative optimization strategy

In this study, the pressurized cabin structure of a specific type of civil high-speed rotorcraft is designed and optimized using T300 carbon fiber composite and AL7075 aluminum alloy as the base materials. An innovative “surrogate model - NSGA-II” collaborative optimization strategy is introduced: key geometric parameters serve as variables to construct a high-fidelity surrogate model, replacing full-scale simulations. This enables joint optimization of strength, stiffness, and weight under multiple loading conditions. Furthermore, the strategy supports multi-objective optimization at the sub-discipline level and resolves interdisciplinary conflicts at the system level. This method significantly enhances optimization efficiency, reducing computational time to just 3% of that required for full-model simulation optimization. It also achieves substantial structural weight reduction, successfully decreasing the mass of the pressurized cabin module by 13.82%. This research provides a critical reference model for the design and optimization of aircraft structures employing hybrid material configurations.