In this paper, the welded frame of a special vehicle is taken as the design and analysis object. Firstly, the main dimensions of the frame are obtained according to the design requirements of generalization and serialization, and the installation position of the crossbeam is obtained by using the topological optimization method. Through comparative analysis, the double groove butt buckle structure of the longitudinal beam and the connection form of the welded frame are determined, and the frame structure design is completed;<br>
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