基于ARMA时序分析的液体火箭发动机模态参数辨识方法  

Identification for modal parameters of liquid rocket engine based on ARMA time-sequence analysis

作　　者：杜飞平[1] 谭永华[2] 陈建华[1] 黄道琼[1] 

机构地区：[1]西安航天动力研究所,陕西西安710100 [2]航天推进技术研究院,陕西西安710100

出　　处：《火箭推进》2010年第6期15-20,共6页Journal of Rocket Propulsion

基　　金：国家航天技术支撑项目

摘　　要：在液体火箭发动机模态参数辨识领域,频域法仍是模态分析的主流方法。但是该方法存在若干不足,如功率泄露、频率混叠、离线分析等,而且需增加复杂的激振设备。本文将基于时域识别的ARMA时序分析法应用到该领域,计算获得了较为精确的模态参数,并且还进行了液体火箭发动机结构非线性影响检测。该方法提高了计算效率,拓展了液体火箭发动机的参数辨识范围,为发动机在工作环境下的结构参数辨识奠定了基础。In the field of the modal parameters identification of liquid rocket engines,the frequency method is widely used,but it has some shortcomings,such as power reveal,frequency domain aliasing and off-line analysis.Moreover,it may need complex equipment for vibration.In this paper,the method of ARMA based on time-domain identification is applied to this field.By using this method,more accurate modal parameters were obtained by calculation.Besides,the nonlinear effects on the structure of the liquid rocket engine were tested.The method of ARMA improved the computational efficiency and extended the identification range of parameters of liquid rocket engine. It laid the foundation for the parameters identification of the rocket engine in the working condition.

关 键 词：ARMA 时序分析法 液体火箭发动机 模态参数辨识 辨识方法 analysis based liquid rocket engine 非线性影响 发动机结构 时域识别 频率混叠 模态分析 离线分析 计算效率 激振设备 工作环境 频域法 检测 基础 

分 类 号：V43[航空宇航科学与技术—航空宇航推进理论与工程]