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現(xiàn)代航空發(fā)動(dòng)機(jī)正朝著高溫、高壓、高轉(zhuǎn)速的方向發(fā)展［1］，其上愈加惡劣的工作環(huán)境不可避免地對(duì)數(shù)控系統(tǒng)中傳感器的穩(wěn)定工作產(chǎn)生不利影響，導(dǎo)致傳感器故障發(fā)生，進(jìn)而干擾控制系統(tǒng)使發(fā)動(dòng)機(jī)性能下降［2］。因此，提高傳感器的可靠性對(duì)發(fā)動(dòng)機(jī)安全、可靠工作極為重要。通過(guò)對(duì)傳感器故障件的科學(xué)診斷，探索其失效機(jī)理，將有利于傳感器的迭代設(shè)計(jì)，進(jìn)而不斷提升可靠性。傳統(tǒng)的傳感器故障檢測(cè)方法存在下列局限性: 1) 無(wú)損檢測(cè)時(shí)，一般采用 X 射線機(jī)，僅適用于對(duì)傳感器的金屬結(jié)構(gòu)進(jìn)行觀察，非金屬部分無(wú)法清晰顯現(xiàn)。且一般只能二維成像，無(wú)法三維立體顯示。2)破壞性觀察。對(duì)故障件進(jìn)行分解以查找故障點(diǎn)，容易造成故障點(diǎn)在分解過(guò)程中被破壞而無(wú)法定位。

工業(yè) CT 技術(shù)能清晰、直觀、準(zhǔn)確地呈現(xiàn)被檢測(cè)物體內(nèi)部的結(jié)構(gòu)( 包括金屬及非金屬部分的三維信息可視化) 、密度變化以及缺陷的性質(zhì)、位置和大小。在工業(yè)、農(nóng)業(yè)領(lǐng)域有著廣泛的應(yīng)用［3 ～ 7］。工業(yè) CT 的上述特點(diǎn)，使其成為傳感器故障無(wú)損、準(zhǔn)確、高效和全方位檢測(cè)行之有效的手段之一，對(duì)傳感器可靠性的提升具有重要作用。

本文針對(duì)某型航空發(fā)動(dòng)機(jī)數(shù)控系統(tǒng)的高壓壓氣機(jī)進(jìn)口總溫傳感器的故障現(xiàn)象，利用工業(yè) CT 技術(shù)對(duì)其進(jìn)行了無(wú)損檢測(cè)，從而快速、準(zhǔn)確地定位到故障點(diǎn)，并利用其提供的傳感器內(nèi)部信息對(duì)故障原因進(jìn)行了分析，采取了相應(yīng)的改進(jìn)措施。最后通過(guò)試驗(yàn)驗(yàn)證了改進(jìn)措施的有效性，結(jié)果表明該傳感器的可靠性得到了顯著提高。

1 、故障描述

某型航空發(fā)動(dòng)機(jī)數(shù)控系統(tǒng)的高壓壓氣機(jī)進(jìn)口總溫傳感器( 以下簡(jiǎn)稱“傳感器”) ，為鎧裝薄膜鉑電阻式溫度傳感器。其核心部件為感溫元件，結(jié)構(gòu)示意圖如圖 1 所示，主要由不銹鋼外殼、薄膜鉑電阻、轉(zhuǎn)接導(dǎo)線、墊塊等組成，其中薄膜鉑電阻的引線與轉(zhuǎn)接導(dǎo)線采用火焰硬釬焊連接。
傳感器的故障為在使用過(guò)程中，出現(xiàn)輸出跳變。根據(jù)傳感器的結(jié)構(gòu)特點(diǎn)，可以推斷傳感器內(nèi)部存在接觸不良現(xiàn)象。但受制于前期的故障檢測(cè)手段，始終未能準(zhǔn)確地定位故障點(diǎn)，無(wú)法對(duì)傳感器進(jìn)行結(jié)構(gòu)和工藝上的改進(jìn)，嚴(yán)重影響了傳感器的可靠性提升。


2 、CT 故障定位

2． 1 檢測(cè)設(shè)備與試驗(yàn)條件

傳感器故障件檢測(cè)設(shè)備采用的是通用電氣公司( GE)生產(chǎn)的 X 射線高分辨率微焦點(diǎn)工業(yè) CT 系統(tǒng)。該系統(tǒng)具備180 kV 微焦點(diǎn)定向式 X 射線管，細(xì)節(jié)分辨能力可達(dá) 1 μm;高對(duì)比度的 14 位數(shù)字平板式探測(cè)器，分辨率( 像素大小)200 μm × 200 μm。系統(tǒng)可以獲得各種大小試件的高精度3D 信息。

試驗(yàn)時(shí)，利用微焦點(diǎn)錐束 CT 對(duì)傳感器故障件進(jìn)行檢測(cè)。為獲得高分辨率 CT 圖像，微焦點(diǎn) X 射線源采用了低功率以獲得更小的焦點(diǎn)尺寸，調(diào)節(jié)射線源至故障件的距離以實(shí)現(xiàn)高比例放大成像。故障件斷層掃描間距為 0． 05 mm，通過(guò)計(jì)算機(jī)斷層掃描后，利用 CT 數(shù)據(jù)采集和圖像重建軟件得到故障件特定的截面圖像。

2． 2 檢測(cè)結(jié)果與分析

工業(yè) CT 是基于不同密度的物質(zhì)對(duì) X 射線的衰減系數(shù)不同，從而在重構(gòu)圖像中顯示不同的灰度差異，進(jìn)而分辨不同的物質(zhì)。因此，傳感器內(nèi)部的金屬部分( 如鉑電阻引線、導(dǎo)線) 、非金屬部分( 如熱縮套管、膠黏劑) 及空腔能很好的區(qū)分開(kāi)來(lái)。

圖 2 是傳感器故障件的感溫元件部位在某一深度處的CT 縱向二維切片圖像。從圖中可以明顯地看到鉑電阻引線與轉(zhuǎn)接導(dǎo)線的焊點(diǎn)，以及在焊點(diǎn)根部的多股轉(zhuǎn)接導(dǎo)線上出現(xiàn)了一個(gè)斷點(diǎn)。由于未對(duì)故障件進(jìn)行任何破壞性的觀察，因此可以確定該斷點(diǎn)是在工作過(guò)程中形成的。并且從圖中可以看出多股轉(zhuǎn)接導(dǎo)線呈松散狀態(tài)。 圖3 是傳感器故障件的感溫元件部位在上述斷點(diǎn)附近的 CT 橫向二維切片圖像。從圖中可以看出轉(zhuǎn)接導(dǎo)線在感溫元件內(nèi)的分布以及其周邊的灌膠狀況。該圖同樣顯示出轉(zhuǎn)接導(dǎo)線比較松散，部分小股線束已經(jīng)斷裂。此外，圖像中明顯有多處面積較大、顏色較深的部分( 例如圖中用白線圈出的區(qū)域) ，說(shuō)明轉(zhuǎn)接導(dǎo)線周邊的灌膠不充分，有氣泡、空腔存在。

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Motion Control 8720SM-007S1CBS3 SPARE PART ONLY - GMS ITEM

78005069 Target Analog I/O Expansion Card Kit, 4 bs/4 outputs

IC200MDD848LT MIXED OUTPUT 120VAC 0.5A PER PT ISOLATED 8PT / INPUT 120VAC GRP 8PT (LT)

IC697BEM741 FIP Bus Controllerfor 9070

MTR-1235-E-A-E-0RR Stepping Motor Nema23 Encoder

Z44A730465-002 Motor half key for B8/3000is or B8/3000HVis motor

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20G11NC060JA0NNNNN PowerFlex 755 AC Packaged Drive

22F-D018N114 PowerFlex 4M- 7.5 kW (10 HP) AC Drive

990NAD21930 Quantum MBUS+ DROP CABLE 20' RT-HD DEC

294D-FD2P5Z-G1-SB Variable Frequency Drive

S8JC-05024 NEW 220VAC，容量： 50W輸出 24V ?2.1A

1492-SPM3B030-N MCB Supplementary Protector 3 A

軟啟動(dòng)器 3RW40241BB14

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150-F43NBRB SMC Flex Smart Motor Controller

1734-ADN POINT I/O DeviceNet Network Adaptor

1783-BMS06SGA Stratix 5700 6 Port Managed Switch

193-EF2BZJ Solid State 160-400 A Overload Relay

20-750-BUS5-F10 PF755 FR10,IP00,DC IN,INPUT TERMINATION

2090-CPWM7DF-10AF02 MP-Series 2 m Length Power Cable

2097-V33PR6-LM Kinetix 350 3.0kW Servo Drive

ET-GT-5ES-5ST 3 RJ45 Ports, 2 Singlemode Fiber Port Ethernet Switch

GFK-2058 VMIC - Analog Output User's Manual - IC697VAL301

IC220MDL721 OUTPUT, 24VDC POSITIVE LOGIC 2.0A, 2PT (REQUIRES 1 IC220TBK082)

IC647DMC020 DataMart 20 Reporting Clients

IC647RAMM RAM:Reliance Electric Auto-Max

IC693MDL310RR 120 Vac Output, 05 Amp (12 Points)

IC756CDV001K-97 DV Development - Compaq True64 Op Sys Addt'l User, Korean, Version 9.7

MSI-PROD-2 Product Management Clients 2 Pack

PLC-5/1771 System 1771-DBMEM2 1771-DB/B EEPROM MEMORY MODULE - 32 K BYTES

Distributed I/O 1790-0V16X LDX I/O, 24 VDC, 16 SINK OUT EXPANSION, D-SHELL

Communications 1788-CNC CNET LOGIX DAUGHTERCARD - COAX MEDIA

Operator Interface 2711E-NKSW2 REPLACEMENT RUN/PROGRAM SWITCH

Support 9304-WVR300R SUPT REINSTATEMENT CONTRACT FOR 9304WVR300

Support 9324-RLD300DES SUPT RENEWAL CONTRACT FOR 9324RLD300DE

DeviceNet Products 2711-K10G10 PV1000 GRAYSCALE KEY, DNET & RS232 PRINT

RSI Software Products 9301-2SE3400DEU5 RSVIEW32 RUNTIME 5K-32K UPGRADE IN-SUPT (DE)

RSI Software Products 9371-EIEC3 RSWIRE IEC LIBRARY

Motion Control MPF-A430P-MJ22BA MOTOR,SERVO,FDGRADE,6.55NM,5000RPM,MULTI

2024-LV Greyline OS, 2 Line, (20) 5MM Chars, LCD, Quick Connect, 10-30 VDC. NEMA 4

HE693THM665 6 channel thermocouple b module for Series 90-30 with 0.1癈 resolution, bus/channel isolation and 50Hz filtering.

IC670MDL930 Relay 2A 8 Pt. 6 Form A/2 Form C Isolated

QPJ-DVN-202 MODULE DEVICE NET SLAVE

STXPBS132 STXi Profibus with 24VDC source (Negative Logic) b, 32 points, expandable to 8 additional modules.

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