采用幅度谱索引法的航天器密封结构泄漏点定位方法
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摘要
针对航天器外壳复杂加筋板结构的泄漏定位问题,提出了一种可在复杂结构中对连续泄漏信号进行定位的幅度谱索引法。使用分布式传感器网络,基于前验幅度谱特征值建立索引矩阵,根据最小方差确定泄漏位置。利用激光多普勒测振仪与加筋铝板搭建了实验系统,选取了3种类型135个声源进行定位实验。结果表明:与网格中心重合的情况下,可以达到4.3mm的平均误差,所有样本的平均定位误差在21.7mm。文章提出的幅度谱索引法有一定的普适性,同样适用于其他航天器复杂结构的结构健康监测及泄漏定位预警。
Aiming at the leakage location problem of complex stiffened plate structure of spacecraft shell,an amplitude spectrum index method for positioning continuous leak signals in complex structures is proposed.The method uses a distributed sensor network to build an index matrix based on the a priori amplitude spectral feature values and determine the leak location based on the minimum variance.An experimental system using a laser Doppler vibrometer and a reinforced aluminum plate is built.Three types of 135 sound sources were selected for positioning experiments.The experimental results show that,with the grid center coincident,the average error of 4.3 mm can be achieved,and the average positioning error of all samples is 21.7 mm.The proposed amplitude spectrum index method has certain universality.The technical method is also applicable to structural health monitoring and leak location warning of complex structures of other spacecraft.
Aiming at the leakage location problem of complex stiffened plate structure of spacecraft shell,an amplitude spectrum index method for positioning continuous leak signals in complex structures is proposed.The method uses a distributed sensor network to build an index matrix based on the a priori amplitude spectral feature values and determine the leak location based on the minimum variance.An experimental system using a laser Doppler vibrometer and a reinforced aluminum plate is built.Three types of 135 sound sources were selected for positioning experiments.The experimental results show that,with the grid center coincident,the average error of 4.3 mm can be achieved,and the average positioning error of all samples is 21.7 mm.The proposed amplitude spectrum index method has certain universality.The technical method is also applicable to structural health monitoring and leak location warning of complex structures of other spacecraft.
引文
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[11]Aljumaili S K,Pearson M R,Holford K M,et al.Acoustic emission source location in complex structures using full automatic delta T mapping technique[J].Mechanical Systems&Signal Processing,2016,72/73:513-524
[2]Imburgia J S.Space debris and its threat to national security:A proposal for a binding international agreement to clean up the junk[J].Vand J Transnat’l L,2011,44:589-641
[3]李维修.几种典型结构的空间碎片在轨感知声发射源定位技术研究[D].哈尔滨:哈尔滨工业大学,2013Li Weixiu.Study on several typical structures of the space debris in orbit cognitive by acoustic emission technology[D].Harbin:Harbin Institute of Technology,2013(in Chinese)
[4]Ernst R,Zwimpfer F,Dual J.One sensor acoustic emission localization in plates[J].Ultrasonics,2016,64:139-150
[5]尹钊,侯向阳,郭军辉,等.超高速撞击声发射信号在载人航天器加筋结构的传播特性实验研究[J].声学学报,2017(3):281-289Yin Zhao,Hou Xiangyang,Guo Junhui,et al.Experimental study on transmission characteristics of acoustic emission signal caused by hypervelocity impact on manned spacecraft with stiffened panel[J].Acta Acustica,2017(3):281-289(in Chinese)
[6]刘治东,庞宝君,刘刚.超高速撞击声发射信号在加筋壁板中传播的模态转换现象研究[J].振动与冲击,2014,21:114-118Liu Zhidong,Pang Baojun,Liu Gang.Hypervelocity impact induced AE wave mode conversion in a plate with vertical stiffeners[J].Journal of Vibration&Shock,2014,21:114-118(in Chinese)
[7]Holland S D,Roberts R A,Chimenti D E,et al.An ultrasonic array sensor for spacecraft leak direction finding[J].Ultrasonics,2006,45(1):121-126
[8]Mclaskey G C,Glaser S D,Grosse C U.Beamforming array techniques for acoustic emission monitoring of large concrete structures[J].Journal of Sound and Vibration,2010,329(12):2384-2394
[9]Xu B,Li Y,Feng H,et al.A Location method using rays for continuous gas leakage in integrally stiffened plates based on the acoustic characteristics of the stiffener[J].Sensors,2015,15(9):24644-24661
[10]龚小月,李一博,靳世久,等.距离对连续性泄漏声源定位精度的影响研究[J].振动与冲击,2016,35(14):151-154Gong Xiaoyue,Li Yibo,Jin Shijiu,et al.Influence of distance on the accuracy of source location of continuous leakage noise[J].Journal of Vibration&Shock,2016,35(14):151-154(in Chinese)
[11]Aljumaili S K,Pearson M R,Holford K M,et al.Acoustic emission source location in complex structures using full automatic delta T mapping technique[J].Mechanical Systems&Signal Processing,2016,72/73:513-524
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