双级延伸喷管模态分析

MODAL ANALYSIS FOR SOLID ROCKET NOZZLE WITH TWO SEGMENT EXTENDIBLE EXIT CONES

采用有限元法对双级延伸喷管收拢状态进行了模态分析，基础喷管的出口锥和两级延伸锥采用四节点壳元，延伸喷管的展开作动筒采用三维梁单元。最后给出了前六阶振型及对应的频率。

Modal analysis for solid rocket nozzle with two segment extendible exit cones (EECs)in stowed condition is presented, in which four-node-shell elements are used for basic cone and EECs, and 3D-beam elements for stretching actuators. The first six orders of mode shapes and their frequencies are also given in the paper.