基于全箭振型数据的大型捆绑火箭模态筛选与对齐方法

Modal selection and alignment of a large bundled rocket based on full rocket modal data

针对大型捆绑火箭开展了模态筛选和对齐方法的研究。采用全箭的振型数据,首先改进了模态振型数据归一化的方式,给出了弯曲、扭转、纵振及局部模态等的筛选系数公式。然后利用基于模态置信度准则的模态对齐方法,结合模态筛选结果,完成了不同秒点的模态对齐。最后在某型号运载火箭动力学模型上进行了仿真验证。仿真结果表明了所提出的模态筛选与对齐方法的正确性和有效性。

In this paper,the studies on modal selection and alignment methods for large bundled rockets were carried out.Using the modal data of the whole rocket,the normalization of the modal data was improved firstly,and the formulas for the selection coefficients of bending,torsion,longitudinal and local modals were given respectively.Then,the modal alignment method based on the Modal Assurance Criterion and the modal selection results were presented to make the modal aligning at different seconds.Finally,simulation verifications were performed on the dynamical model of a certain type of bundled rocket.Simulation results show the correctness and effectiveness of the proposed modal selecting and alignment method.