Multi-disciplinary optimization design method and application of BWB fuselage structure based on PRSEUS configuration

Aiming at the problems such as low structural bearing efficiency, structural weight gain, heavy load and cabin noise caused by high rear backbraced engine in BWB layout, based on novel materials and pultruded rod stitched efficient unitized structure(PRSEUS), a multi-disciplinary optimization design method for unconventional circular body structures with aerodynamic, noise, vibration and technological constraints was studied to improve the bearing efficiency and lightweight of structures. Based on the adaptive agent model construction technology, an agent model for the performance analysis of the aerodynamic and noise subsystem of the airframe structure is established to predict the aerodynamic load and noise performance of the airframe structure, and the basic requirements of the aerodynamic and noise performance are transformed into constraints such as geometric size and mechanical response, so that the multi-disciplinary problems are concentrated in a set of finite element analysis model with efficient mathematical programming method. The time-consuming problem of multi-disciplinary high-precision model analysis is solved, and the multi-disciplinary optimization design of the wing-body integrated body structure is realized. Through the finite element analysis of the body structure, the bearing efficiency of the structure has been greatly improved, and the weight loss rate of the central body structure has reached 8.7% under the premise of meeting the constraints of various disciplines.