STRUCTURAL MECHANICAL PROPERTIES AND MULTI-FIELD COUPLING ANALYSIS OF VARIABLE SWEPT WING AIRCRAFT

With the development of aerospace technology, variable sweep wing aircraft have attracted attention for their excellent performance. Accurate analysis of their structural mechanics and multi-field coupling performance is a challenge. The research aims to analyse the structural mechanics and multi-field coupling performance of variable sweep wing aircraft. Using numerical simulation methods, the influence of four coupled fields of motion, vibration, heat, and aerodynamics on aircraft performance was comprehensively considered, with special attention paid to the two factors of contact friction coefficient and heat dissipation environment temperature. The results indicated that the overall stress distribution was relatively uniform, and no obvious stress concentration "hot-spots" were observed. In the absence of gravitational equilibrium, the contact forces of contact force numerical model (CFNM)1, CFNM2, and CFNM3 ultimately reached 3.5 x 1.63 N, 3.3 x 1.63 N/2.9 x 1.63 N. The maximum stress in a vibration environment was negatively correlated with the contact friction coefficient. When the contact friction coefficient increased from 0.8 to 1.2, the stress decreased from 191 MPa to 68 MPa. In addition, when the cooling environment temperature reached 50 degrees C the maximum stress in the structure exceeded 100, indicating that the structure no longer met the strength requirements. The results proposed a significant impact of contact friction coefficient and heat dissipation environment temperature on the structural performance of aircraft, and provided important information for improving flight safety and structural optimisation design.