Taking the torsional beam of the car as the research object, the fatigue life of the torsional beam is analyzed through the simulation experiment, and the optimization scheme is selected according to the life of the torsional beam. Firstly, eight component thicknesses are selected as design variables by Plackett-Burman experimental design method, and the radial basis function neural network approximate model of the beam is established. Taking the maximum equivalent stress of the beam as the optimization objective, the beam mass, and the maximum deformation as the constraint conditions, the multi-objective optimization is carried out, and then two new structural design schemes are carried out for the parts with a rich life. The optimization results show that the maximum deformation is reduced by 15.9%, the maximum equivalent stress is reduced by 10.1%, and the overall life of the beam is extended by 40.6%.
In this paper, static analysis, modal analysis and harmonic response analysis are carried out on the rotor structure of single-stage double-suction centrifugal pump. The fatigue life of the rotating shaft was analyzed with the nCode Designlife module in ANSYS. The results show that the maximum equivalent stress is greater than the allowable stress of the material and is located at the journal of the transmission torque connected with the coupling. The maximum deformation also occurs here at 0.4857mm. The axis of rotation is liable to resonate at the first natural frequency of the non-rigid body. The frequency which has the greatest influence on the vibration of the rotating shaft is near the third and fourth order natural frequencies of modal analysis and should be avoided. The minimum number of circulation at the maximum stress is 1.785e7 times, and other positions are above 1014 times. The results show that the pump group works stably under the design condition and the rotor performance meets the design requirements.
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