Optimum design of stiffness and frequency of mounting bracket used in aeronautical electronic equipment

Abstract

Aeronautical electronic equipment, used for data collection during flight, is usually fixed to the nose radome using mounting brackets. The stiffness and first-order frequency performance of the mounting brackets is studied to avoid plastic deformation and resonance during flight, which is of great engineering significance for improving flight stability. The static strength and modal analysis of the mounting bracket under inertial load are conducted, and a sensitivity analysis method is used to determine the design variables of the installation bracket. With the goal of minimizing the total weight of the structure as the optimization objective, the thickness of each component of the bracket is optimized while ensuring the stiffness and first-order modal performance of the installation bracket. The vibration tests are conducted for the optimized installation bracket structure. The results show that the stiffness of the optimized installation bracket structure remains basically unchanged, the first-order frequency is increased by 18.09%, and the weight is reduced by 19.33%. The improved design can meet the equipment installation requirements.

Keywords

• mounting bracket
• static strength
• stiffness
• modal analysis
• optimum design