Abstract
To solve the problem of frequent cracks in the air-cooled engine exhaust hood of a fire fighting robot, the structure parameters are optimized based on Beam element.Firstly,the finite element model of the exhaust hood is analyzed for pre-stress modal analysis, compared with the choice of Beam unit to simulate the bolted connection, and the RSM is used to optimize it.Secondly, the sample points are generated by Latin hypercube sampling, and the Kriging response surface model with good fitting is constructed. The sensitivity analysis is used to screen the targeted parameters, and the response surface optimization model with the total deformation, mass and first natural frequency as the target is established.Finally, MOGA is used to optimize the exhaust hood, and the optimal results are rounded and verified.The results show that the total deformation of the optimized exhaust hood is reduced by 7.18 %, the mass is reduced by 4.68 %, and the first natural frequency is increased by 74.98 %.The stiffness of the exhaust hood increases, which avoids the resonance interval. The application of Beam element effectively improves the simulation efficiency and provides a reference for the structural optimization of bolted connections.
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