Multifunctional structures, like conformal antennas, are key features of intelligent stealth design in advanced military aircraft. Due to their complex payloads and diverse configuration constraints, achieving integrated design in coordination with the airframe presents significant challenges. To address the challenge of lightweight design for multifunctional aircraft structures, a cross-level optimization technique which can balance functionality and load-bearing capacity has been proposed. This study investigates parameter sensitivity analysis methods based on fully analytical strategies for the cross-level transmission of design variables fundamentally. The optimization process that considers local conformal constraints for the main structural layout and dimensional optimization, a functional skin layup optimization that balances load-bearing and wave-transmission requirements, and a honeycomb configuration parameter optimization process that accounts for absorption constraints and load-bearing was established systematically. This approach enables cross-level optimization design from the main load-bearing structure layout down to the details of individual honeycomb cells, and the methodology was implemented using the in-house developed structural optimization software SABRE-OPT. Validation based on a typical conformal antenna structure demonstrates that the proposed cross-level optimization technology can achieve integrated conformal antenna and structural design while balancing multiple functional and load-bearing constraints, and holds significant value for engineering implementation.
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