关键词: 固体推进剂火箭发动机;可延伸喷管;模态分析;有限元法

Abstract: 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.

Key words: Solid propellant rocket engine;Extension nozzle;Modal analysis;Finete element method