集中质量法与一致质量法对导弹模态计算的影响研究

Study on the influence of the consistent mass method and lumped mass method in the mode of the rocket

给出了导弹模态计算的三种质量模型,其中包括一种集中质量法的模型与两种一致质量法的模型,并研究了这三种模型对结构模态计算结果的影响。基于模型导弹的结构参数,通过有限元方法计算了三种模型的模态。研究发现,三种模型前三阶弯曲模态基本接近,高阶模态误差较大。

Three mass models for rocket modes are put forward, which insist of a lumped mass model and two consistent mass models, and the influence of the models on the rocket＇s modes are studied. Based on the real parameter of the rocket, the modes for the three models are simulated by FEM method. It is found that the low order modes of the three models are close, while there is great error in the high order modes.