结构动力学模型修正技术在液体火箭发动机中的应用  

Application of structural dynamic model updating technique in liquid rocket engine

作　　者：闫松 李斌[2] 李锋 

机构地区：[1]液体火箭发动机技术重点实验室,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》2018年第1期27-35,52,共10页Journal of Rocket Propulsion

摘　　要：可重复使用成为未来液体火箭发动机的重要发展趋势,载荷分析是进行疲劳问题分析的前提,而精确的结构动力学模型又是进行响应计算和界面载荷分析的基础。由于液体火箭发动机结构的复杂性,需要采用模型修正技术对初始建立的有限元模型进行修正。主要介绍了MC-1发动机的模型修正及界面载荷研究,SSME发动机模型修正过程、模型修正技术在航空航天其他领域的应用情况。根据是否考虑试验结果的不确定性,将模型修正方法分为确定性模型修正和随机模型修正两大类。主要阐述了经典的基于灵敏度的模型修正方法和对发展方向进行展望。Reusable engines will be an important development trend of liquid rocket engine （LRE）. Load analysis is the prerequisite of fatigue analysis. Accurate structural dynamic model is the basis of re- sponse calculation and interface load analysis. Model updating techniques need to be used to tune the ini- tial finite element （FE） model due to the complexity of liquid rocket engine. The model updating and in- terface load research of MC-1 engine, the updating process of SSME engine model, and the application of model updating technique in other fields of aerospace are introduced in this paper. According to whether consider uncertainly of the test results, the model updating method is divided into deterministic model up- dating and stochastic model updating. The classical model updating method based on sensitivity is focused here. At last, the research result is summarized and the future development is prospected.

关 键 词：液体火箭发动机 模型修正 MC-1发动机 SSME 界面载荷分析 

分 类 号：V434-34[航空宇航科学与技术—航空宇航推进理论与工程]