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The research on MEMS Sensors show that current sensing techniques are a very effective method of detecting wire failure as there has been reported success of wire monitoring by Aegis Devices Inc. The Rogowski Coil Current Sensor shows huge promise in detecting arcing faults due to it being able to detect fast rising transients, and may also pick up other signals from the wire or connector that would signify if corrosion, contact fretting or aging of the wire insulation has occurred. The other advantages of being non-intrusive, providing excellent isolation, good linearity, not suffering saturation issues like current transformers or Hall effect current Sensors and not being influenced by temperature make it an excellent candidate for this application. Recent papers on LTCC have shown that sensors similar to what is desired for this project can be very easily fabricated and integrated into a unit. This can be adapted to make a coil that could wrap around each wire and monitor for faults. It is likely that the design would use two coils linked in opposite polarity so as to reduce the effects of cross over from adjacent wiring. Signal processing techniques would need to be used to process the signals that pass the Rogowski coil to enable accurate detection of faults. The rogowski coil will be tested to see if it can detect the triboelectric effect also. Humidity sensors are certain to be included in this solution as part of the environmental monitoring system to aid in wire aging prognosis. The capacitive polymer humidity based relative humidity sensor was evaluated as the best choice for this application as it is the best option for monolithic integration, and its fast response time and long term reliability in harsh environments result in continous monitoring in a rapidly changing environment. It has been shown also that it is possible to design a wireless humidity sensor for remote monitoring of humidity conditions in other parts of the aircraft that may not be easily accessible. Strain gauges will be examined to see if they can detect changes in material hardness in aged and new samples of wiring to see if a relationship can be established which can tell if the wire has aged to point of failure. It is well known that vibration exists within the aircraft and that this is transferred to the wiring, therefore by looking at vibration levels as well as the strain of the wiring then this could highlight potential sites of the wiring that has failed or is near to failing. Strain gauges have been utilised on the outer structure of aircraft to detect stresses where failure may occur, and MEMS Sensors have been previously designed to address this. |
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Mally89(金幣+2): 感謝應助！~歡迎常來！~好運哦！~\(^o^)/~ 2012-03-12 07:47:50
shawmar(金幣+50, 翻譯EPI+1): ★★★★★最佳答案 2012-03-14 13:54:15
Mally89(金幣+2): 感謝應助！~歡迎常來！~好運哦！~\(^o^)/~ 2012-03-12 07:47:50
shawmar(金幣+50, 翻譯EPI+1): ★★★★★最佳答案 2012-03-14 13:54:15
對微機電系統(tǒng)傳感器的研究表明，有報道稱由神盾設備公司研發(fā)的羅戈夫斯基線圈電流傳感器在電流傳感技術(shù)線故障檢測方面很有作用。它能夠檢測電弧故障線，因為它能檢測快速上升的瞬態(tài)，也可以接收來自線圈或連接器的腐蝕、接觸微動或電線的絕緣層老化等其他信號。電流傳感器還有很多其它有點，例如非侵入性可提供了極好的隔離、線性度好可以避免遭受由互感器或霍爾效應導致的飽和電流、同時它也不受受溫度的影響，這些優(yōu)點使得其可以在此應用領(lǐng)域具有廣闊前景。基于低溫共燒陶瓷的最新研究顯示，所報道的傳感器和這個項目闡述的傳感器類似，制作過程簡單，可集成到一個單元。這可以具有更高的適應性，使線圈環(huán)繞每根電線并監(jiān)視故障。像這樣使用兩個極性相反的線圈連接的設計可以減少了鄰近布線產(chǎn)生的相互影響。需要將信號處理技術(shù)用于處理通過羅戈夫斯基線圈的信號，使故障得到準確檢測。同時也有必要測試羅戈夫斯基線圈，看它是否可以監(jiān)測到摩擦起電效應。作為環(huán)境監(jiān)測系統(tǒng)的一部分，濕度傳感器是一個解決方案，它可以幫助預估電線老化�；跐穸热菪跃酆衔锏南鄬穸葌鞲衅魇堑淖罴堰x擇，因為它可以單片集成，并且具有快速響應時間和長時間可靠性，在惡劣和迅速變化的環(huán)境中可連續(xù)監(jiān)測結(jié)果。它也已被證明這是可用于飛機設計的無線濕度傳感器，但也可能不容易獲得其他區(qū)域濕度條件下的遠程監(jiān)控信息。將要檢查應變片，看它們是否能夠檢測到接近老化的布線和新產(chǎn)品材料的硬度變化，看看是否可以建立一定的關(guān)系，是否可以檢測出電線老化故障點。眾所周知，飛機內(nèi)存在振動，該震動可被轉(zhuǎn)移到布線，因此，振動水平以及布線的應變可能反應附近未布線地點的失效。應變計已成功用于飛機的外部結(jié)構(gòu)，以檢測由于故障產(chǎn)生的應力，可采用前面提及的已微機電系統(tǒng)傳感器設計來解決這個問題。 |
2樓2012-03-12 04:34:55
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