基于ARM的航空結(jié)構(gòu)沖擊載荷監(jiān)測系統(tǒng)研究
[Abstract]:With the improvement of the performance of aeronautics and vehicles, their structures are becoming more and more complex. In the course of service, these structures will inevitably be impacted by various forms and will easily result in different degrees of damage. These damages will become a potential threat to structural safety and service life. Therefore, the research on-line real-time monitoring of impact loads in structural health monitoring technology is of great significance. Based on this urgent engineering requirement, a set of on-line real-time monitoring system based on ARM is developed in this paper. The main research work is as follows: firstly, the concept of acoustic emission technology is introduced briefly. The acquisition principle of piezoelectric sensor and the propagation characteristics of acoustic emission signal are analyzed. According to the above introduction, wavelet transform is selected as the processing technology of acoustic emission signal, and the way to obtain the arrival time by using this technique is analyzed. At the same time, a fast algorithm of non-orthogonal wavelet transform is proposed. Secondly, the basic principles of cross-correlation function and neural network are introduced, and the two algorithms are improved according to the requirement of real system monitoring. Then, the hardware and software design of the on-line real-time monitoring system for impact load is introduced. The system chooses STM32F407 as the main control device and has the characteristics of miniaturization and portable (179.5mm 脳 140mm), low power consumption and low cost. Finally, two algorithms are run to verify the functional feasibility of the monitoring system and to compare the advantages and disadvantages of the two algorithms through impact experiments on the wing trailing edge model of an aircraft with actual aeronautical structure. The experimental results show that the system can effectively identify the impact load in the monitoring area of 600 脳 600 mm (the location error of the cross-correlation algorithm is less than 20 mm). The non-boundary location error of BP neural network algorithm is less than that of 10mm, the running time is short (no more than 5 s), and the image of location interface is clearly displayed.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:V215;TP274
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 李惠;鮑躍全;李順龍;張東昱;;結(jié)構(gòu)健康監(jiān)測數(shù)據(jù)科學(xué)與工程[J];工程力學(xué);2015年08期
2 朱斌;陳龍;強(qiáng)_";程鯉;;美軍F-35戰(zhàn)斗機(jī)PHM體系結(jié)構(gòu)分析[J];計算機(jī)測量與控制;2015年01期
3 孫俠生;肖迎春;;飛機(jī)結(jié)構(gòu)健康監(jiān)測技術(shù)的機(jī)遇與挑戰(zhàn)[J];航空學(xué)報;2014年12期
4 馬丁;石立華;付尚琛;曹洪福;;基于時頻分析的Lamb波散射源定位方法研究[J];壓電與聲光;2013年04期
5 劉玉海;尹成;潘樹林;胡永泉;;基于互相關(guān)函數(shù)法的地面微地震信號檢測研究[J];石油物探;2012年06期
6 唐艷;付存君;魏建新;;基于自適應(yīng)學(xué)習(xí)速率的改進(jìn)BP神經(jīng)網(wǎng)絡(luò)[J];計算機(jī)光盤軟件與應(yīng)用;2012年04期
7 陳昊;童小燕;姚磊江;程起有;李斌;;復(fù)合材料層合板低速沖擊的聲發(fā)射研究[J];機(jī)械科學(xué)與技術(shù);2010年11期
8 蘇永振;袁慎芳;周恒保;;基于三角測量和最優(yōu)化技術(shù)的復(fù)合材料沖擊定位兩步法[J];宇航學(xué)報;2009年03期
9 袁慎芳;邱雷;王強(qiáng);苗苗;余振華;;壓電-光纖綜合結(jié)構(gòu)健康監(jiān)測系統(tǒng)的研究及驗(yàn)證[J];航空學(xué)報;2009年02期
10 陳林;宋海斌;;基于Morlet小波匹配追蹤算法的地震時頻屬性提取[J];石油地球物理勘探;2008年06期
相關(guān)博士學(xué)位論文 前5條
1 邱雷;基于壓電陣列的飛機(jī)結(jié)構(gòu)監(jiān)測與管理系統(tǒng)研究[D];南京航空航天大學(xué);2011年
2 蘇永振;航空材料結(jié)構(gòu)低速沖擊健康監(jiān)測研究[D];南京航空航天大學(xué);2010年
3 王強(qiáng);Lamb波時間反轉(zhuǎn)方法及其在結(jié)構(gòu)健康監(jiān)測中的應(yīng)用研究[D];南京航空航天大學(xué);2009年
4 唐頎;超高速撞擊板波特性與聲發(fā)射空間碎片在軌感知技術(shù)[D];哈爾濱工業(yè)大學(xué);2008年
5 羅光坤;Morlet小波變換理論與應(yīng)用研究及軟件實(shí)現(xiàn)[D];南京航空航天大學(xué);2007年
相關(guān)碩士學(xué)位論文 前2條
1 江艷;飛行器結(jié)構(gòu)低速沖擊載荷定位研究[D];南京航空航天大學(xué);2013年
2 余振華;面向航空結(jié)構(gòu)的主動Lamb波健康監(jiān)測技術(shù)研究[D];南京航空航天大學(xué);2007年
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