To enhance the stability and strength of the lower beam itself, combined with the design characteristics of the body structure, it is necessary to change the opening structure of the lower beam assembly to a closed section structure, that is, adding a radiator lower beam reinforcing plate structure at the bottom of the lower beam to make the lower beam assembly A closed section is formed. At the same time, because the joint between the lower beam assembly and the left and right columns of the radiator is weak, only the three bolts on the left and right are connected, it is difficult to ensure the stability of the quadrilateral of the radiator frame. The radiator frame is easy to cause diamond when the fan is running at high speed. For the turbulence, a connecting plate structure needs to be added to the lower beam of the radiator and the inner side of the left and right columns to ensure the reliability of the lower frame. The response curve of the installation point on the upper left side of the water tank has not been greatly improved before and after the improvement of the structure of the radiator frame. The trend of improvement before and after the improvement is basically the same, which may be related to the improvement of the structure of the radiator frame without the upper beam structure.
After the structure of the lower beam of the radiator frame is improved, the dynamic stiffness performance of the left and right mounting points of the water tank in the two directions of X and Z is greatly improved, the vibration frequency is excessively gentle, and the frequency peak of the local part is effectively avoided, but Y The dynamic stiffness performance of the direction is basically unchanged before and after the improvement of the radiator frame structure. This indicates that the improved position, location and direction of the radiator frame structure are closely related to the dynamic stiffness performance of the final X, Y and Z directions. In this paper, since the structure of the lower beam of the radiator frame is improved, the opening structure is changed to a closed section structure, and a connecting plate is added to the inner side of the radiator lower beam and the left and right columns, and the upper beam is not improved. Therefore, the simulation analysis results only show changes in the dynamic stiffness performance of the lower mounting point.
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