基于加权正则化的火箭发动机振动传递路径分析

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摘要为了给火箭发动机振动控制提供依据，需要对受到多源激励的发动机进行振动传递路径分析，其主要包括载荷识别和贡献量分析两个环节。为了准确识别发动机多源激励载荷并提供可靠的振动贡献量分析结果，提出一种基于加权正则化的改进传递路径分析技术。首先，推导出了载荷识别相对误差上界，并利用加权矩阵和贝叶斯理论提高载荷识别精度，并基于此提出改进的传递路径分析理论。然后，进行某发动机地面振动试验。最后，根据所提的加权正则化载荷识别理论和参考点响应数据识别了多源激励，并计算分析了不同振源在目标点的振动贡献量。分析结果表明，相较于传统传递路径分析技术，所提方法能更准确地识别多源激励，提供更可靠的振动贡献量分析结果。

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关键词 ：多源载荷识别, 传递路径分析, 火箭发动机

Abstract：To provide the basis for vibration control of rocket engine under multi-load, the vibration transfer path analysis (TPA) of the engine is necessary, mainly consisting of load identification and vibration contribution analysis. To identify accurately the engine multi-source excitation and provide reliable analysis results of vibration contribution, an improved TPA based on weighted regularization was proposed. Firstly, the upper bound of relative load identification error was derived and then weighted matrix and Bayesian theory were adopted to improve the accuracy of load recognition, and then the theory of the improved TPA was built. Secondly，a ground vibration testing of the rocket engine was performed to analyze its path contributions. Finally，with the response data of the reference points and the proposed theory of the load identification, the loads on the engine were identified and the vibration contributions of different loads on the target points were calculated and analyzed. The results show that, the proposed TPA is more accurate than the traditional TPA in load identification and vibration contribution analysis.

Key words： multi-load identification transfer path analysis rocket engine

收稿日期: 2017-12-11 出版日期: 2019-04-28

引用本文:

路广霖 1,罗亚军 1,张希农 1,李录贤 1,马驰骋 2. 基于加权正则化的火箭发动机振动传递路径分析[J]. 振动与冲击, 2019, 38(9): 271-276.
LU Guanglin 1 LUO Yajun 1 ZHANG Xinong 1 LI Luxian 1 MA Chicheng 2. Vibration transfer path analysis of rocket engine based on weighted regularization. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(9): 271-276.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I9/271

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