火箭发动机阀门开关动作状态识别技术研究

推进技术 ›› 2018, Vol. 39 ›› Issue (5): 1171-1176.

火箭发动机阀门开关动作状态识别技术研究

王志^1,2,王建军¹,刘玉¹,田晶²

北京航空航天大学能源与动力工程学院，北京 100191; 沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室，辽宁沈阳 110136,北京航空航天大学能源与动力工程学院，北京 100191,北京航空航天大学能源与动力工程学院，北京 100191,沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室，辽宁沈阳 110136

发布日期:2021-08-15
作者简介:王志，男，博士生，讲师，研究领域为动力学参数识别。E-mail: wangzi629@buaa.edu.cn 通讯作者:王建军，男，博士，教授，研究领域为结构系统动力特性和振动抑制。
基金资助:
国家自然科学基金(11702177)。

Condition Recognition Technique for Valve Switching Action of Rocket Engine

School of Energy and Power Engineering，Beihang University，Beijing 100191，China;Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System， Shenyang Aerospace University，Shenyang 110136，China,School of Energy and Power Engineering，Beihang University，Beijing 100191，China,School of Energy and Power Engineering，Beihang University，Beijing 100191，China and Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System， Shenyang Aerospace University，Shenyang 110136，China

Published:2021-08-15

摘要/Abstract

摘要： 针对液氢液氧火箭发动机阀门在工作过程中出现拒动、卡滞等故障，研究了基于振动特性分析的阀门开关动作状态识别技术。首先应用双自寻优小波分析技术对阀门振动信号进行降噪，再利用短时傅里叶变换对降噪后信号进行时频分析，最后提炼出用信号相对瞬时能量这一指标来识别阀门的开关动作状态。基于此技术，运用LabVIEW开发出便携式阀门开关动作自动识别系统。经工程实际应用，阀门“开”动作比“关”动作相对瞬时能量大1个数量级，“关”动作比无动作时相对瞬时能量大2个数量级。阀门开关动作状态可通过相对瞬时能量及时、准确地识别出。

关键词: 火箭发动机阀门；振动特性；双自寻优小波分析；相对瞬时能量；状态识别

Abstract: For some faults of refusing action， sticking and jamming under valves operation for a liquid oxygen/liquid hydrogen rocket engine， the condition monitoring technique of valve switching action based on vibration characteristic analysis was investigated. Dual self-optimizing wavelet technology was used to denoise the vibration signals of valves. Short-time Fourier transform method was then adopted to conduct the time-frequency analysis of the denoised signals. The relative instantaneous energy extracted from the signal analysis was regarded as one index to recognize the status of valve switching action. Based on this tool， a portable system which can automatically detect the valve action was explored by using LabVIEW software. The practical application of the system shows that the relative instantaneous energy of the ‘open’ action of the valve is one order of magnitude larger than that of the ‘off’ action， and the relative instantaneous energy of the ‘off’ action is 2 orders of magnitude larger than that of the status without any action. The switching status of the valve can be identified timely and accurately by the relative instantaneous energy.

Key words: Rocket engine valve；Vibration characteristics；Dual self-optimizing wavelet analysis；Relative instantaneous energy；Condition recognition

王志,王建军,刘玉,田晶. 火箭发动机阀门开关动作状态识别技术研究[J]. 推进技术, 2018, 39(5): 1171-1176.

WANG Zhi^1,2,WANG Jian-jun¹,LIU Yu¹,TIAN Jing². Condition Recognition Technique for Valve Switching Action of Rocket Engine[J]. Journal of Propulsion Technology, 2018, 39(5): 1171-1176.

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