Abstract: In order to process dynamic data of liquid propellant rocket engine , an approach using wavelet analysis was studied. Based on the singularity detection and error filtering theories of wavelet analysis, the process of dynamic data processing was analyzed and validated by the dynamic data coming from one ground fire-test of a liquid propellant rocket engine. The results demonstrate that the wavelet analysis method is very fit for dynamic process of engine. It does not require the prior knowledge of process error and also can fulfill the tasks of singular data detection and corresponding error filtering simultaneously.

Key words: Liquid propellant rocket engine;Wavelet analysis;Dynamic characteristic;Data handling;Filtering

摘要： 研究了基于小波分析的液体火箭发动机动态数据处理方法 ,给出了数据处理模型 ,应用小波奇异性检测和误差滤波理论 ,分析了动态数据的处理过程 ,并用某液体火箭发动机某次地面试车的动态测试数据进行了验证。结果表明 ,小波分析方法不需要过程误差的先验知识 ,能够同时完成异常数据的检测及相应误差的滤除任务 ,非常适合于液体火箭发动机的动态工作过程。

关键词: 液体推进剂火箭发动机;小波分析;动态特性;数据处理;滤波