A forward design method and application for lightweight structure of weaponry
For the urgent requirement of modern weaponry,and promoting the structure design,a forward design method based on the surrogate-assisted multi-objective optimization(MOO)is proposed.According to the process from conceptual design to parametric design,the presented method can realize the MOO design by interacting information and reconstructing surrogate model(SM),and a bullet box bracket of a light vehicle-mounted anti-aircraft gun is specifically taken as an example to verify the feasibility.Firstly,with the best load path obtained by the topology optimization,the geometrical and finite element model are established,respectively.Secondly,the number of the variables is reduced through the sensitivity analysis,then the MOO model is constructed to minimize the mass and maximize the stiffness under the constraints of the modal frequency and structural strength.Subsequently,the Kriging model is used to approximate the MOO problem which is solved by the differential evolution algorithm.The MOO models are modified by the comparisons between the intermediate results,and the SMs are reconstructed by the sample-infilling strategy.Finally,taking the lightweight and safe into account,3 superior design solutions in 44 optimization results are selected for comparisons with the initial design,and the total mass is reduced by 31.2%,24.7%and 21.8%,respectively.The presented validation indicates that the proposed forward optimization design method can improve the light-weight design evidently and has a significant reference to optimizing the relevant structure.
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