| Based on the reinforcing structure of naval ship emitting device, the article focused on the analysis of the dynamic characteristics and dynamic response of the reinforcing structure and the lightweight design of the base.Based on the Finite element method, we used shell elements to establish the reinforcing structure of various parts in ABAQUS, and then used binding constraints to assemble the parts into a whole structure of the finite element model. By using centralized mass element and coupling constraints, simulated the connection of emitting device and reinforcing structure, and then used this model for dynamic analysis.Carrying out finite element modality analysis on the established model, and obtained the natural frequencies and mode shapes of the reinforcing structure. Based on the theory of sensitivity, the resonance frequency may be optimized to improve the dynamic characteristics of the reinforcing structure while ensuring little change in the total mass of the structureBased on the theory of nonlinear dynamics, Carrying out transient dynamic analysis on the structure, obtained the stress distribution of the reinforcing structure in the 12 kinds of shooting conditions and the Z-axis vibration displacement curve at the trunnion. The results showed that all conditions are met structural strength and stability requirements, and there is a certain margin optimization; and when the naval ship pitching, emitting device along the horizontal azimuth 0°, pitch angle 85° shooting, the stress of the reinforcing structure suffered the biggest and vibration response of the most intense.After the base model is imported to HyperMesh, The article focused on the lightweight design of the base in OptiStruct by using the SQP method. After optimization, the total mass of the base is reduced but the strength and stability still meet the requirements, which provides reference and theoretical basis for the optimization design of the other structures of naval ship. |
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