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基于三维精细化动力学模型的局部模态获取技术

Local Mode Acquisition Technology Based on Three-Dimensional Detailed FEM Model
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摘要 Structural dynamic problems encountered within launch vehicles are sometimes related to entire dynamic characteristics of the vehicle,and sometimes related to local dynamic characteristics of some parts of vehicles.To acquire local dynamic characteristics,it usually requires the building of a three-dimensional detailed FEM model.It is important that the simulation of mass and stiffness of local part is accurate.The local mode acquisition of a gas tank and its bracket installed in the inter-tank section is taken as an example in this paper.It can be seen that the local modes are consistent with the section modal test results.Finally,the verified three-dimensional detailed FEM model of the inter-tank section is assembled within the entire launch vehicle,and the local modes of the gas tank and its bracket under flight conditions are predicted.
出处 《Aerospace China》 2023年第2期52-56,共5页 中国航天(英文版)
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