Multi-objective optimization design for vibration characteristics of longitudinal and transverse stiffened conical shells

  Objectives  In order to improve the overall bending mode frequency of the structure and reduce the acceleration level at the end of the stiffened cone in the low frequency range, a mathematical model of a multi-objective optimization design for the vibration characteristics of a stiffened conical shell is established.

  Methods  Finite element software ANSYS is used to model a vertical and horizontal stiffened conical shell. The vibration modal frequency and structural response under the vertical downward unit concentrated force at the end of the stiffened conical shell are analyzed. Based on Matlab, the vibration characteristics of the stiffened conical shell are optimized by a genetic algorithm and the tolerance sorting method.

  Results  The results show that with the increase of tolerance and target weight, the acceleration level of the optimal structural scheme decreases. With single objective optimization for the same target value, there can be multiple schemes.

  Conclusions  The research results of this paper can provide useful references for the acoustic design of reinforced conical shell structures.