Numerical modelling and experimental determination of vibration characteristics of cylindrical shell with nonuniform stiffeners

摘要

Cylindrical shell with nonunifrom stiffeners can be designed according to the position of excitation force to minimize the structural vibration. The meaning of nonuniform stiffeners in the paper contains two aspects: nonuniform stiffeners height and nonuniform stiffeners spacing. In this work, the effect and the mechanism of vibration reduction of nonuniform stiffeners are discussed based on the changes of excitation force position, nonuniform stiffeners height and nonniform stiffeners spacing. The results of numerical analysis illustrate when nonuniform stiffeners with large stiffeners are close to the excitation, the structure vibration is small because of the decreasing input vibration power; the effect of vibration reduction to change nonuniform stiffeners heights is more effective than that to change nonuniform stiffeners spacing. The rationality of the model and the effectiveness of nonuniform stiffeners on minimizing structural vibration are proved by experiment in the end.