|Table of Contents|

ITD and STD based identification for modal parameters of liquid rocket engine(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2012年03期
Page:
34-39
Research Field:
研究与设计
Publishing date:

Info

Title:
ITD and STD based identification for modal parameters of liquid rocket engine
Author(s):
DU Fei-ping1;  TAN Yong-hua2;  CHEN Jian-hua1
1. Xi’an Aerospace Propulsion Institute, Xi’an 710100, China
Keywords:
modal parameters identificationnonlinear testITD methodSTD method
PACS:
V434-34
DOI:
-
Abstract:
In the field of the modal parameters identification of the liquid rocket engine, the frequency domain method is widely used. But this method has some shortcomings, such as power reveal, frequency mixture and off-line analysis. In this research, the ITD and STD methods based on time-domain identification were applied to this field. Since the two algorithms are based on the linear system, the Hilbert transform is used in this paper to verify that the engine has the characteristic of the linear systems. Compared with the frequency-domain method, the results show that the method has higher recognition accuracy, uses the measured response signals only, needs more simple equipments in the identification, and can conduct the online analysis. Thus it laid a foundation for the engine parameters identification in the working environment.

References:

[1]黄道琼, 张继桐, 何洪庆. 四机并联发动机低频动态特性分析[J]. 火箭推进, 2004, 4(30): 28-31.
[2]张贵田. 高压补燃液氧煤油发动机[M]. 北京: 国防工业出版社, 2005.
[3]邹经湘, 于开平, 杨炳渊. 结构系统的时变参数识别方法[J]. 力学进展, 2000, 30(3): 370-377.
[4]Ibrahim S R, Mikulcik E C. A method for the direct identification of vibration parameters from the free response[J]. The Shock and Vibration Bulletin, 1977, 47(4):183-198.

Memo

Memo:
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Last Update: 1900-01-01