Comprehensive Optimization Design of Beam Structure for Double-Spindle Horizontal Machining Center
In order to reduce the total mass of the beam while ensuring its low-order natural frequency and stiffness,a design meth-od combining topology optimization and size optimization was proposed.The topology optimization method was used to determine the in-ternal structure of the beam and then it was repaired.Based on the finite element analysis results of the repaired beam,taking the thick-ness and holes size inside the beam as design variables,the overall maximum deformation and the first-order natural frequency were taken as constraints,and the total mass was minimized as the objective function to establish a mathematical model.The multi-objective genetic algorithm(MOGA)was used for solving.The initial sample points were obtained through CCD experiment design and a response surface was established using the Kriging model.After multiple tests,the total mass of the beam is successfully reduced by 20.3％com-pared with before optimization.
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