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    • 簡介:摘要片式電阻因其體積小、精度高、可靠性好等優(yōu)點被廣泛應(yīng)用于許多領(lǐng)域,有替代傳統(tǒng)電阻的趨勢。片式電阻是通過絲網(wǎng)將電阻材料印刷到電阻基片上的,其阻值通常具有不大于40的制造誤差,一般采用激光調(diào)阻法對其阻值進行修調(diào)。調(diào)阻精度是衡量激光調(diào)阻性能的重要技術(shù)指標(biāo),由于我國在激光調(diào)阻方面的研究起步較晚,與國外設(shè)備相比,國產(chǎn)激光調(diào)阻機的調(diào)阻精度有待進一步提高。論文分析了影響激光調(diào)阻精度的因素,確定應(yīng)用優(yōu)化調(diào)阻控制策略的方法。實際數(shù)據(jù)表明,混合集成電路中采用的同一臺激光調(diào)阻設(shè)備按照同一種精度要求微調(diào)電阻阻值時,實際調(diào)阻精度與被調(diào)電阻的阻值具有一定的相關(guān)性。提高調(diào)阻精度,而優(yōu)化調(diào)阻控制策略的前提是準(zhǔn)確掌握激光調(diào)阻的阻值對調(diào)阻精度的影響,因此論文的研究內(nèi)容為畢業(yè)設(shè)計的任務(wù)是基于數(shù)理統(tǒng)計原理,結(jié)合數(shù)值模擬方法,確定相關(guān)關(guān)系的定量表達式,并結(jié)合實測數(shù)據(jù)進行分析驗證。關(guān)鍵詞激光調(diào)阻調(diào)阻精度線性擬合目錄目錄目錄第一章第一章緒論緒論111引言112激光調(diào)阻513激光調(diào)阻系統(tǒng)及修調(diào)技術(shù)機理614切割圖形715激光調(diào)阻機7第二章第二章線性擬合的基本原理線性擬合的基本原理8第二章第二章MATLAB的應(yīng)用的應(yīng)用931MATLAB產(chǎn)生隨機數(shù)1232線性擬合和線性回歸1233擬合優(yōu)度與檢驗14第四章第四章實驗原理實驗原理1941實驗?zāi)康?942試驗分析2043試驗步驟21第五章第五章實驗過程實驗過程2151試驗數(shù)據(jù)的獲得2152線性擬合過程2553拐點計算與結(jié)論2654試驗中的不足與展望28
      下載積分: 8 賞幣
      上傳時間:2024-03-15
      頁數(shù): 31
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    • 簡介:湖南某金礦ZK0202鉆孔工程設(shè)計及孔斜控制摘要湖南某金礦ZK0202鉆孔,位于湖南省岳陽市平江縣長壽鎮(zhèn)黃金洞鄉(xiāng)楊山莊,地處山區(qū),區(qū)內(nèi)構(gòu)造變形強烈,褶皺、韌性剪切帶、斷層、劈理、面理廣泛發(fā)育,構(gòu)成了本區(qū)復(fù)雜的構(gòu)造格局。在這樣的地質(zhì)條件下進行鉆孔施工,需要進行嚴(yán)格的工程設(shè)計。采用金剛石繩索取芯鉆進方法。首先在鉆孔結(jié)構(gòu)設(shè)計方面采用三級孔身結(jié)構(gòu),采用Ф91MM的鉆頭開孔至6M,下入Ф89MM孔口管;中間孔段用直徑為Ф75MM的鉆頭鉆進至152M,下入Ф73MM套管;終孔段用Ф59MM的鉆頭鉆進至終孔。選擇地質(zhì)系統(tǒng)液壓立軸式巖心鉆機XY5型巖心鉆機、國內(nèi)往復(fù)式泥漿泵BW250型、直徑為5CM的供水管、鉆機動力用Y250M4電動機、取芯設(shè)備電動機采用Y132S4型、選擇功率大于190KW的發(fā)電機組、采用S59型繩索取芯鉆具、鉆塔選擇SG18,附屬設(shè)備包括小口徑金剛石鉆進用水龍頭、普通提引器、JW1型泥漿攪拌機、木馬夾持器。管材使用金剛石繩索取芯專用管材。選擇金剛石繩索取芯雙管鉆頭。Ф59MM孔段鉆壓控制在45~85KN、轉(zhuǎn)速控制在600~1200KN、沖洗液泵量控制在30~45LMIN。Ф75MM孔段鉆壓控制在6~10KN、轉(zhuǎn)速控制在400~850KN、沖洗液泵量控制在40~60LMIN。Ф91MM孔段鉆壓控制在8~15KN、轉(zhuǎn)速控制在350~700KN、沖洗液泵量控制在50~70LMIN。泥漿采用泡沫泥漿配方為高陽土4~5;7;CMC02~03;PHP200~NA2CO3300PPM;DF1發(fā)泡劑150~200PPM。為了解決鉆孔偏斜嚴(yán)重的問題,對造成孔斜的原因進行分析,采取必要的防斜手段。首先設(shè)備安裝及開孔質(zhì)量必須做好。再者在鉆遇強造斜孔段采用下限鉆壓及轉(zhuǎn)速,即75MM孔段采用鉆壓6KN、轉(zhuǎn)速355RMIN,59MM孔段采用鉆壓45KN、轉(zhuǎn)速577RMIN。最后在鉆具的組合上采用滿眼鉆具防斜,合理的連接扶正器,75MM孔段上扶正器至鉆頭的距離為937M;中扶正器至鉆頭的距離為37M。下扶正器距鉆頭1M;59MM孔段上扶正器至鉆頭的距離為772M;中扶正器至鉆頭的距離為309M。下扶正器距鉆頭1M。關(guān)鍵詞鉆孔工程設(shè)計孔斜控制滿眼鉆具扶正器I目錄第1章前言111畢業(yè)設(shè)計的目的112畢業(yè)設(shè)計的內(nèi)容要點113畢業(yè)設(shè)計的任務(wù)1第2章工程概況221礦區(qū)自然地理222礦區(qū)交通條件323生活及工作條件324鉆孔目的及要求4241鉆孔目的4242鉆孔要求425設(shè)計鉆孔地層情況4第3章鉆孔結(jié)構(gòu)設(shè)計531確定鉆孔結(jié)構(gòu)的原則532鉆孔結(jié)構(gòu)設(shè)計5第4章鉆探設(shè)備及器材641鉆機選擇642泥漿泵7421泥漿泵的流量計算743供水泵及供水管844動力機9441鉆機用電動機的型號和技術(shù)參數(shù)9442取芯設(shè)備用電動機的型號和技術(shù)參數(shù)945發(fā)電機組功率選擇946繩索取芯設(shè)備10461S59型繩索取芯鉆具1047鉆塔10471塔高選擇10472鉆塔負荷量計算1148附屬設(shè)備12481水龍頭12482吸水管和高壓送水管12483提引器13484泥漿攪拌機13485滑車裝置的選擇13486天車荷載計算及鉆塔校核14487夾持器1449鉆探管材選擇14第5章鉆機場的修建及設(shè)備的安裝1651鉆探機場的修建1652設(shè)備的安裝與布置16521鉆機場的總體布置16
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      上傳時間:2024-03-11
      頁數(shù): 51
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    • 簡介:目錄目錄第一章第一章設(shè)計背景及設(shè)計意義2第二章第二章系統(tǒng)方案設(shè)計3第三章第三章硬件531溫度檢測和變送器532溫度控制電路633AD轉(zhuǎn)換電路734報警電路835看門狗電路83636顯示電路顯示電路1037電源電路12第四章軟件設(shè)計1441軟件實現(xiàn)方法1442總體程序流程圖1543程序清單19第五章設(shè)計感想29第六章參考文獻30第七章附錄3171硬件清單3172硬件布線圖31第二章系統(tǒng)方案的設(shè)計這次課程設(shè)計題目為熱電偶構(gòu)成的熱處理爐的溫度控制系統(tǒng),技術(shù)要求1設(shè)定溫度范圍為0~9992溫度顯示為0~9993到設(shè)定溫度報警熱處理爐爐溫控制系統(tǒng)的控制過程是單片機定時對爐溫進行檢測,經(jīng)AD轉(zhuǎn)換芯片得到相應(yīng)的數(shù)字量,經(jīng)過計算機進行數(shù)據(jù)轉(zhuǎn)換,得到應(yīng)有的控制量,去控制加熱功率,從而實現(xiàn)對溫度的控制。如下圖所示進行系統(tǒng)設(shè)計時應(yīng)考慮如下問題1爐溫變化規(guī)律的控制,即爐溫按預(yù)定的溫度時間關(guān)系變化。2溫度控制范圍如0~1000℃,這就涉及到測溫元件、電爐功率的選擇等。3控制精度、超調(diào)量等指標(biāo),這涉及到AD轉(zhuǎn)換精度、控制規(guī)律選擇等。溫控系統(tǒng)主要由溫度傳感器、溫度調(diào)節(jié)儀、執(zhí)行裝置、被控對象四個部分組成,其系統(tǒng)結(jié)構(gòu)圖如圖1所示。被控制對象是大容量、大慣性的電熱爐溫度對象,是典型的多階容積遲后特性,在工程上往往近似為包含有純滯后的二階容積遲后;由于被控對象電容量大,通常采用可控硅作調(diào)節(jié)器的執(zhí)行器,其具體的電路圖如圖2所示。
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      上傳時間:2024-05-21
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    • 簡介:附錄一附錄一英文文獻原文英文文獻原文OPTIMIZEDKINEMATICSOFMECHANICALPRESSESWITHNONCIRCULARGEARSEDOEGELMHINDERSMANNRECEIVEDONJANUARY81997ABSTRACTTHEQUALITYOFPARTSMANUFACTUREDUSINGMETALFMINGOPERATIONSDEPENDSTOALARGEDEGREEONTHEKINEMATICSOFTHEPRESSRAMNONCIRCULARGEARSYTOOBTAINTHOSESTROKETIMEBEHAVIOURSWEAIMATASANOPTIMUMFTHEVARIOUSMETALFMINGOPEWITHAROTATIONALANGLEDEPENDENTSPEEDRATIOINTHEPRESSDRIVEMECHANISMOFFERANEWWARATIONSINTERMSOFMANUFACTURINGTHEPAPEREXPLAINSTHEPRINCIPLEUSINGAPROTOTYPEPRESSWHICHWASBUILTBYTHEINSTITUTEFMETALFMINGMETALFMINGMACHINETOOLSATHANOVERUNIVERSITYITWILLPRESENTTHEKINEMATICSASWELLASTHEFCESTQUESTHATOCCURINTHEPROTOTYPEFURTHERMETHEPAPERDEMONSTRATESUSINGONEEXAMPLEOFDEEPDRAWINGONEOFFGINGTHATTHEPRESSDRIVEMECHANISMWITHNONCIRCULARGEARSMAYBEUSEDADVANTAGEOUSLYFVIRTUALLYALLMETALFMINGOPERATIONSKEYWDSPRESSGEARKINEMATICS1LNTRODUCTIINCREASINGDEMSONQUALITYINALLAREASOFMANUFACTURINGENGINEERINGINSHEETMETALFMINGASWELLASINFGINGGOHINHWITHTHENECESSITYTOMAKEPRODUCTIONECONOMICALINCREASINGMARKETIENTATIONREQUIRESTHATBOTHTECHNOLOGICALECONOMICREQUIREMENTSBEMETTHEIMPROVEMENTOFQUALITYPRODUCTIVITYOUTPUTBYMEANSOFINNOVATIVESOLUTIONSISONEOFTHEKEYSTOMAINTAININGEXTENDINGONESMARKETPOSITIONINTHEPRODUCTIONOFPARTSBYMETALFMINGWENEEDTODISTINGUISHBETWEENTHEPERIODREQUIREDFTHEACTUALFMINGPROCESSTHETIMESNEEDEDTOHLETHEPARTWITHSOMEFMINGPROCESSESWEHAVETOADDTIMEFNECESSARYADDITIONALWKSUCHASCOOLINGLUBRICATIONOFTHEDIESTHISYIELDSTWOMETHODSOFOPTIMIZATIONACCDINGTOTHETWOASPECTSOFQUALITYOUTPUTINDERTOSATISFYBOTHASPECTSTHETASKISTODESIGNTHEKINEMATICSTAKINGINTOACCOUNTTHEREQUIREMENTSOFTHEPROCESSPROCESSINEQUALMEASURETOTHEGOALOFDECREASINGWKPRODUCTIONCOSTSPREVIOUSPRESSDESIGNSHAVENOTSIMULTANEOUSLYMETTHESETECHNOLOGICALECONOMICALREQUIREMENTSTOASUFFICIENTEXTENTTHEYAREVERYCOSTLYTODESIGNMANUFACTURESUCHASPRESSESWITHLINKDRIVES6THISMAKESITNECESSARYTOLOOKFINNOVATIVESOLUTIONSFTHEDESIGNOFTHEPRESSITSDESIGNSHOULDBELARGELYSTARDIZEDMODULARIZEDINDERTOREDUCECOSTS6FIG1PROTOTYPEPRESS3PRESSDRIVEWITHNONCIRCULARGEARS31PRINCIPLETHEUSEOFNONCIRCULARGEARSINTHEDRIVEOFMECHANICALCRANKPRESSESOFFERSANEWWAYOFMEETINGTHETECHNOLOGICALECONOMICDEMSONTHEKINEMATICSOFTHEPRESSRAMAPAIROFNONCIRCULARGEARSWITHACONSTANTCENTERDISTANCEISTHUSPOWEREDBYTHEELECTRICMOTBYTHEFLYWHEELDRIVESTHECRANKMECHANISMITSELFTHEUNIFMDRIVESPEEDISTRANSMITTEDCYCLICALLY
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      上傳時間:2024-03-15
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    • 簡介:英文文獻英文文獻APPLICATIONOFHALLCURRENTSENS1INTRODUCTIONWITHTHEEXPANSIONOFURBANPOPULATIONTHESCALEOFCONSTRUCTIONALLELECTRICALEQUIPMENTINCREASESCONSUMPTIONINCREASESTHECITYOFTENOVERLOADTHEPOWERSUPPLYEQUIPMENTPOWERHASBECOMEINCREASINGLYHARSHENVIRONMENTTHEPOWEROFTHE“TEST“MEMESERIOUSACCDINGTOSTATISTICSEVERYDAYELECTRICALEQUIPMENTHAVEBEENABOUT120TIMESTHEPOWERPROBLEMSOFVARIOUSINTRUSIVE60OFELECTRONICEQUIPMENTFROMPOWERFAILURETHEREFETHEGROWINGIMPTANCEOFPOWERISSUESPROMINENTIGINALLYASASUPPTINGROLEMEPOWERWITHLESSCAPITALINVESTMENTBYMANUFACTURERSRESEARCHERSTHEATTENTIONPOWERTECHNOLOGYTHUSBECOMEANEWTECHNOLOGYTODAYSMALLPOWEREQUIPMENTHASBEENINTEGRATEDMEMENEWTECHNOLOGIESFEXAMPLESWITCHINGPOWERSUPPLYHARDSWITCHINGSOFTSWITCHINGPARAMETERREGULATIONLINEARFEEDBACKREGULATMAGICAMPLIFIERTECHNOLOGYNUMERICALCONTROLPRESSUREREGULATPWMSPWMELECTROMAGICCOMPATIBILITYETCDIRECTPROMOTIONOFTHEACTUALNEEDSOFTHEPOWERTECHNOLOGYCONTINUESTODEVELOPPROGRESSTOAUTOMATICALLYDETECTDISPLAYTHECURRENTOVERCURRENTOVERVOLTAGEOTHERHAZARDSHAPPENSWITHAUTOMATICPROTECTIONMEADVANCEDINTELLIGENTCONTROLWITHSENSDETECTIONSENSSAMPLINGSENSINGAGROWINGTENDENCYTOPROTECTTHEPOWERSUPPLYTECHNOLOGYTODETECTCURRENTVOLTAGESENSSHAVECOMEINTOBEINGBYTHEMAJITYOFPOWERINCHINABEGANDESIGNERSOFALLAGES2THECURRENTSENSPRINCIPLEOFWKCURRENTSENSCANMEASUREALLTYPESOFCURRENTFROMDCTOTENSOFKHZACITSWKINGPRINCIPLEISMAINLYBASEDONHALLEFFECTPRINCIPLETHISARTICLEISMOSTLYBELOWZEROFLUXPRINCIPLEOFCLOSEDLOOPPRODUCTEXAMPLEWHENTHEPRIMARYCONDUCTTHROUGHTHECURRENTSENSTHEPRIMARYCURRENTIPWILLPRODUCEMAGICFIELDLINESTHEPRIMARYFOCUSINTHECEAIRGAPMAGICFIELDLINESAROUNDTHEAIRGAPBUILTINTOTHECEOFTHEHALLCHIPCANGENERATEELECTRICITYFROMTHEHALLELEMENTELECTRONICCIRCUITOPERATIONALAMPLIFIERINSTABILITYCAUSEDBYWKINGCONDITIONSCURRENTSENSSINPRODUCTIONIN25℃IP0WHENTHECIRCUMSTANCESHAVEBEENOFFSETCURRENTTOTHEMINIMUMBUTLEFTTHEPRODUCTIONLINESENSWILLPRODUCEACERTAINSIZEOFTHEOFFSETCURRENTPRODUCTTECHNICALDOCUMENTATIONREFERREDTOINTHEACCURACYOFTHECURRENTINCREASEHASBEENCONSIDEREDTHEIMPACTOFMIGRATION3LINEARITYLINEARITYDETERMINESTHESENSOUTPUTSIGNALVICESIDECURRENTISTHEINPUTSIGNALTHEPRIMARYCURRENTIPWITHINTHEMEASUREMENTISPROPTIONALTOTHEDEGREEOFNANJINGELECTRONICTECHNOLOGYCOLTDASAHICURRENTSENSLINEARITYISBETTERTHAN054TEMPERATUREDRIFTSOFFSETCURRENTISOISCALCULATEDAT25℃WHENTHEHALLELECTRODESSURROUNDINGTEMPERATURECHANGESISOWILLMAKEADIFFERENCETHEREFECONSIDERINGTHEMAXIMUMOFFSETCURRENTISOISVERYIMPTANTCHANGESWHICHIOTREFERSTOTHECURRENTSENSTEMPERATUREDRIFTPERFMANCEOFTHETABLEVALUES5OVERLOADCURRENTSENSOVERLOADISOCCURRINGCURRENTOVERLOADTHEMEASUREMENTSCOPETHEPRIMARYCURRENTWILLINCREASEOVERLOADCURRENTDURATIONMAYBESHTERTHEOVERLOADVALUEMAYEXCEEDTHESENSALLOWSTHEVALUEOFOVERLOADCURRENTVALUEOFSENSGENERALMEASUREMENTDOESNOTCOMEOUTBUTWILLNOTDAMAGETHESENS6ACCURACYHALLEFFECTSENSACCURACYDEPENDSONTHESTARDRATEDCURRENTOFIPNAT25℃THESENSMEASUREMENTPRECISIONTHEPRIMARYCURRENTHASSOMEINFLUENCEWHILEASSESSMENTOFSENSACCURACYMUSTALSOTAKEINTOACCOUNTTHECURRENTOFFSETLINEARITYTEMPERATUREDRIFTEFFECTS4SENSTYPESTRUCTUREINSTALLATIONMETHODSENSSGENERALLYLABEL“SENSMODEL““PRODUCTIONDATE“OFTWOPARTS“SENSMODEL“ISUSEDTOINDICATETHESENSMODELRATEDMEASUREMENTSTHEWKINGPOWERSUPPLYWIRINGINSTRUCTIONS“SENSPRODUCTIONDATE“ISFROMTHE8BITDIGITALFMINDICATINGTHATTHESENSINTHEMONTHOFPRODUCTIONLOTIN
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      上傳時間:2024-03-14
      頁數(shù): 16
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    • 簡介:論文題目隔爆變壓器的安裝工藝及故障排查年級2011級院系機電工程與自動化學(xué)院學(xué)生姓名指導(dǎo)老師2014年6月2摘要隔爆變壓器是一種可移動的成套供、變電裝置。用來改變交流電壓的大小,它適用于有甲烷混合氣體和煤塵等有爆炸危險的礦井中。將6KV10KV電源轉(zhuǎn)換成400(380)、693(660)、1200(1140)、3450(3300)V煤礦井下所需的低壓電源。礦用變壓器外殼為全波紋,兩邊開蓋式和上開蓋式結(jié)構(gòu),具有機械強度高、溫升低、散熱效果好等優(yōu)點。鐵芯選用優(yōu)質(zhì)低損耗硅鋼片,空載損耗低、空載電流小、噪音低。采用H級絕緣材料及先進的絕緣結(jié)構(gòu),熱穩(wěn)定性好,可在高溫下持續(xù)滿負荷運行。隔爆變壓器的安裝工藝就變成了一項重要的工作,它與隔爆變壓器的工作性能息息相關(guān)。因此,本文中所講的就是隔爆變壓器的安裝工藝,當(dāng)然還有最為重要的隔爆變壓器的故障排除,他關(guān)系到生產(chǎn)供電的安全性。關(guān)鍵字關(guān)鍵字隔爆變壓器安裝故障排除
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      上傳時間:2024-03-16
      頁數(shù): 20
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    • 簡介:AUTOMATINGAUTOMATINGMANUFACTURINGMANUFACTURINGSYSTEMSSYSTEMSWITHWITHPLCSPLCSCONTROLENGINEERINGHASEVOLVEDOVERTIMEINTHEPASTHUMANSWERETHEMAINMETHODFCONTROLLINGASYSTEMMERECENTLYELECTRICITYHASBEENUSEDFCONTROLEARLYELECTRICALCONTROLWASBASEDONRELAYSTHESERELAYSALLOWPOWERTOBESWITCHEDONOFFWITHOUTAMECHANICALSWITCHITISCOMMONTOUSERELAYSTOMAKESIMPLELOGICALCONTROLDECISIONSTHEDEVELOPMENTOFLOWCOSTCOMPUTERHASBROUGHTTHEMOSTRECENTREVOLUTIONTHEPROGRAMMABLELOGICCONTROLLERPLCTHEADVENTOFTHEPLCBEGANINTHE1970SHASBECOMETHEMOSTCOMMONCHOICEFMANUFACTURINGCONTROLSPLCSHAVEBEENGAININGPOPULARITYONTHEFACTYFLOWILLPROBABLYREMAINPREDOMINANTFSOMETIMETOCOMEMOSTOFTHISISBECAUSEOFTHEADVANTAGESTHEYOFFER11LADDERLOGICLADDERLOGICISTHEMAINPROGRAMMINGMETHODUSEDFPLCSASMENTIONEDBEFELADDERLOGICHASBEENDEVELOPEDTOMIMICRELAYLOGICLOGICDIAGRAMSWASASTRATEGICONEBYINGLADDERLOGICASTHEMAINPROGRAMMINGMETHODTHEAMOUNTOFRETRAININGNEEDEDFENGINEERSTRADESPEOPLEWASGREATLYREDUCEDMODERNCONTROLSYSTEMSSTILLINCLUDERELAYSBUTTHESEARERARELYUSEDFLOGICARELAYISASIMPLEDEVICETHATUSESAMAGICFIELDTOCONTROLASWITCHASPICTUREDINFIGURE11WHENAVOLTAGEISAPPLIEDTOTHEINPUTCOILTHERESULTINGCURRENTCREATESAMAGICFIELDTHEMAGICFIELDPULLSAMETALSWITCHREEDTOWARDSITTHECONTACTSTOUCHCLOSINGTHESWITCHFIGURE11SIMPLERELAYLAYOUTSSCHEMATICSFIGURE13APLCILLUSTRATEDWITHRELAYSMANYRELAYSALSOHAVEMULTIPLEOUTPUTSTHROWSTHISALLOWSANOUTPUTRELAYTOALSOBEANINPUTSIMULTANEOUSLYTHECIRCUITSHOWNINFIGURE14ISANEXAMPLEOFTHISITISCALLEDASEALINCIRCUITINTHISCIRCUITTHECURRENTCANFLOWTHROUGHEITHERBRANCHOFTHECIRCUITTHROUGHTHECONTACTSLABELLEDABTHEINPUTBWILLONLYBEONWHENTHEOUTPUTBISONIFBISOFFAISENERGIZEDTHENBWILLTURNONIFBTURNSONTHENTHEINPUTBWILLTURNONKEEPOUTPUTBONEVENIFINPUTAGOESOFFAFTERBISTURNEDONTHEOUTPUTBWILLNOTTURNOFFFIGURE14ASEALINCIRCUIT12PROGRAMMINGTHEFIRSTPLCSWEREPROGRAMMEDWITHATECHNIQUETHATWASBASEDONRELAYLOGICWIRINGSCHEMATICSTHISELIMINATEDTHENEEDTOTEACHTHEELECTRICIANSTECHNICIANSENGINEERSHOWTO
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      上傳時間:2024-03-14
      頁數(shù): 22
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    • 簡介:摘要當(dāng)今世界,電力在人們的日常生活和工業(yè)生產(chǎn)中有著相當(dāng)重要的作用。在完善的電力系統(tǒng)中,斷路器是必不可少的開關(guān)設(shè)備。斷路器不僅可以可以切斷系統(tǒng)運行時的空載電流和負荷電流,而且在電力系統(tǒng)出現(xiàn)故障時,可以與繼電保護裝置配合切斷過負荷電流,對電力系統(tǒng)的安全穩(wěn)定運行起著必不可少的作用。高壓領(lǐng)域常選用高壓真空斷路器,不同于其他滅弧介質(zhì)的斷路器。高壓真空斷路器質(zhì)量輕、結(jié)構(gòu)簡單、運行維護方便、不會對環(huán)境造成污染,所以一經(jīng)采用,迅速發(fā)展為高壓開關(guān)領(lǐng)域的主流。傳統(tǒng)的高壓真空斷路器按其操動機構(gòu)可分為電磁式和電動彈簧式,早期,真空斷路器常配備電磁式操動機構(gòu),該機構(gòu)能較好地滿足真空滅弧室的需求,被廣泛地應(yīng)用于實踐并取得了很大發(fā)展,但電磁式操動機構(gòu)的機械結(jié)構(gòu)復(fù)雜故障率高,很快就而被新興的電子控制、永磁保持的永磁操動機構(gòu)替代。永磁機構(gòu)主要利用永磁體的磁力使得斷路器保持在開斷或者閉合位置,減少了機械部件的使用,既減輕了斷路器的體積,也使得故障發(fā)生的機濾大大減少。采用了永磁機構(gòu)的斷路器,可以與計算機技術(shù)相互結(jié)合,便于實現(xiàn)斷路器控制的智能化本論文以單片機為基礎(chǔ),設(shè)計一套高壓真空斷路器雙穩(wěn)態(tài)永磁機構(gòu)的智能控制系統(tǒng),實現(xiàn)保護、控制、測量、開關(guān)量監(jiān)測等功能。實現(xiàn)對電力系統(tǒng)的電壓、電流、有功、無功的實時監(jiān)測,實現(xiàn)電流速斷保護、過電壓保護和欠電壓保護、自診斷以及自鎖和報警等功能。關(guān)鍵詞電力系統(tǒng);斷路器;永磁操動機構(gòu)目錄0前言11概述311設(shè)計研究的內(nèi)容和意義312永磁操動機構(gòu)的發(fā)展現(xiàn)狀與前景42永磁操的機構(gòu)621永磁操動機構(gòu)的優(yōu)點722永磁機構(gòu)的結(jié)構(gòu)723雙穩(wěn)態(tài)永磁機構(gòu)的工作原理1024雙穩(wěn)態(tài)永磁機構(gòu)的磁路1125永磁機構(gòu)的始動安匝1526雙穩(wěn)態(tài)永磁機構(gòu)動態(tài)特性163永磁機構(gòu)的控制系統(tǒng)1631永磁機構(gòu)控制系統(tǒng)設(shè)計原則1732控制器總體設(shè)計1733控制系統(tǒng)的硬件結(jié)構(gòu)2134硬件模塊設(shè)計22341電源設(shè)計22342高壓真空斷路器分、合閘狀態(tài)的檢測24343CPU模塊24344信號輸入單元25345信號輸出單元26
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      上傳時間:2024-03-10
      頁數(shù): 94
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    • 簡介:我的社會實踐報告班級商務(wù)133班學(xué)號2013040103312姓名鄧惠碧正文社會實踐是讓我們大學(xué)生可以從大學(xué)校園走出來,走向社會,走進生活,懂得謀生的艱辛,學(xué)會謀生的技能。在注重綜合能力的今日,寒暑假社會實踐被作為促進學(xué)生技能培訓(xùn),加強身體和心理素質(zhì),學(xué)會校園內(nèi)學(xué)不到的技能的第一步。一個學(xué)期眨眼就過去,寒假有一個多月,我覺得應(yīng)該好好找個工作然后好好做,辛苦點也沒關(guān)系。但是礙于家里有點事,我媽說不如就像暑假那樣去幼兒園幫幫忙,剛好時間方面適合。這次還有我的同學(xué)一起來幫忙,雖然時間不長,也讓我覺得很開心。時間過得飛快,轉(zhuǎn)眼間我的社會實踐任務(wù)已經(jīng)結(jié)束了。回想起剛開始工作的時候,對于在幼兒園工作仍然感覺很新鮮,不過去年暑假也來幫忙過,所以工作上挺熟練了。這次更多是在照顧小孩上學(xué)到了新知識。像在做早操這件事就有各種情況發(fā)生,我在的那個班里有個小朋友,在這里叫他小雄吧,他是個很有個性的孩子,學(xué)習(xí)很認真,但是不愿聽老師的意見,喜歡怎樣就怎樣。有一天早上,大家都像往常一樣非常認真地跟著老師做早操,可是小雄蹲著玩地上的樹葉,老師問他為什么不做早操,他說做早操沒意思,讓他站起來,一轉(zhuǎn)身,他又蹲下去,老師怎么哄他都不聽。直到早操結(jié)束,我走也能運用到我們平時的待人接物,盡管我們長大了我們還是有缺乏自信的問題,所以或許我們也能幫助身邊的一些缺乏自信的朋友,或者可能是自己。這次的實習(xí)能獲得這么多的進步真的要感謝這么多老師和小孩們,畢竟我的經(jīng)驗少,很多時候都要她們幫忙。雖然不是第一次做,在工作中仍會有犯錯的時候,還好他們沒有太多的責(zé)怪,反而給予我很多幫助和指導(dǎo),他們鼓勵我不懂就問,提醒我要珍惜時間,這些我都牢記在心里。特別從小孩們身上我學(xué)到了很多,他們的懂事,他們的可愛,讓我覺得我長大了反而沒他們厲害。下面是我這次社會實踐的體會心得社會實踐已經(jīng)結(jié)束了,在這段難忘的日子里,讓我對在社會上工作有了新的認識和看法,只有自己經(jīng)歷過才會明白這個社會的人是如此不同,跟在學(xué)校遇到的要不同,遠沒有我們想象中這么美好,但也沒網(wǎng)絡(luò)上說的怎么恐怖。不管怎樣,都要保持自我的美好,應(yīng)該對社會抱有希望,擁有期望始終比頹廢放棄要好得多。在大學(xué)里,我們還是一張白紙,只有通過實踐才能真正認識到社會,在這次實踐中,我能親身感受到工作中的人情世故,在磕磕碰碰中一點一點地積累經(jīng)驗和學(xué)習(xí)待人接物之道。也讓我從中挖掘到自己的能力,同時認識到自己在不同方面的缺點和不足,例如在工作中還是缺乏積極性。幼兒園的工作每天都是千篇一律,但是每天都是不一樣的,雖然都是已經(jīng)比我小很多的小孩,不同的小孩都有著不同的性格,對
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      上傳時間:2024-03-11
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    • 簡介:1畢業(yè)論文畢業(yè)論文課題名稱非物質(zhì)文化遺產(chǎn)保護下梅山武術(shù)的傳承與發(fā)展學(xué)生姓名學(xué)號系、年級專業(yè)指導(dǎo)教師年月日IIONINHERITANCEDEVELOPMENTOFINTANGIBLECULTURALHERITAGEMEISHANSURGERYABSTRACTMEISHANSURGERYISAPOPULARTRADITIONALSPTINREGIONALETHNICRURALAREASOFCENTRALCHINASHUNANPROVINCEISAFOLKBOXINGCOMPLETETECHNICALSYSTEMITSIGINSCANBETRACEDBACKTOTHEANCIENTNTHERNSONGDYNASTYACCDINGTOLEGENDCREATEDBYWENTIANXIANGAVERYWITHGEOGRAPHICALCULTURALACTERISTICSPROFOUNDCULTURALHERITAGEITSMILLENNIUMCULTUREHASDEEPLYAFFECTEDTHEFMATIONOFMANYOFTHELOCALVILLAGERSTHEVILLAGEFOLKOFPERSONALITYISAMANIFESTATIONOFONEOFTHEMAINCARRIERSOFHUNANCULTUREHOWEVERWITHTHEMIGRATIONOFTHETIMESTHEDEVELOPMENTOFMEISHANSURGERYAFFECTEDBYMANYFACTSINCLUDINGIMPROVINGTHELIVINGSTARDSOFTHELOCALVILLAGESOFMATERIALPRODUCTIONCHANGESINVILLAGERSIDEASTHEIMPACTOFFEIGNCULTUREGOVERNMENTPOLICYFOCUSDEVIATIONMARTIALARTSWKSCHOOLTOTHELACKOFLOCALSPTSCULTURALEDUCATIONTHESEFACTSLEDTOSURGERYNOWISTHESTATUSQUOMEISHANDOWNTURNSTAGESOFDEVELOPMENTHOWEVERTHISTRADITIONALSPTMEISHANSURGERYINNONMATERIALCULTURALASPECTSOFMODERNLIFETHATPEOPLEHAVEALOTOFUSEFULVALUESPECIFICALLYINHEALTHEDUCATIONNONMATERIALECONOMYTOURISMINDERTOMAKENONMATERIALVALUESMEISHANSURGERYTOINHERITANCEDEVELOPMENTINMYRESEARCHMEISHANSURGERYASITSINDEPTHUNDERSTINGANALYSISTOXINHUACOUNTYSUBURBANCOUNTYLOCATEDINTHESOUTHEASTERNMARTIALARTSSCHOOLMARTIALARTSTEACHERSPRACTITIONERSOFMARTIALARTSSTUDYBYREFERENCETOLITERATUREFIELDTRIPSLAWSTATISTICSLOGICALANALYSISOTHERRESEARCHMETHODSMEISHANSURGERYTOOBJECTIVELYMAKEAMECOMPREHENSIVEINVESTIGATIONANALYSISDOWNCASTMEISHANFSURGERYFDIFFERENTPOPULATIONSPERCEPTIONRECOGNITIONOFTHEEXTENTOFSURGERYWEREINVESTIGATEDMEISHANACCESSGANIZETHECOLLECTEDDATAANALYSISTHEFINALANALYSISOFTHECURRENTSITUATIONITSREASONSFTHEDOWNTURNONTHISBASISTHEPROPOSEDCRESPONDINGMEASURESDESIGNEDTOAPPEALTOSOCIALIMPTANCETHATMEISHANMASSESREPRESENTEDBYTHETRADITIONALFOLKARTMARTIALARTSIVEINHERITANCEITSESSENCETOITSDREGSINNOVATIONONTHE
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      上傳時間:2024-03-14
      頁數(shù): 23
      6人已閱讀
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    • 簡介:1OPENPITEXCAVATIONOFTHEDEFMATIONACTERISTICSOFTHEPROCESSOFRESEARCHMINESLOPESTABILITYPROBLEMISTHATOURCOUNTRYSINCETHE20THCENTURYTHEMOSTSINCETHE70SFEATURESONEOFTHEENGINEERINGGEOLOGICALPROBLEMSSLOPEMINESUSUALLYOPENINTHECOMPLEXGEOLOGICALENVIRONMENTHASACOMPLEXGEOLOGICALSTRUCTUREITHASBECOMEMINEBLASTINGEXCAVATIONSLOPECONTROLINAKEYENGINEERINGTECHNICALPROBLEMSUNREASONABLEASARESULTOFOPENPITMINEDESIGNMANAGEMENTOFIMPERFECTIONSCAUSEDBYTHEMOVEMENTOFROCKSLOPEDESTRUCTIONADIRECTIMPACTONMINEPRODUCTIONSECURITYACCDINGTOSTATISTICSHAVETAKENPLACEWILLBEPOSSIBLECOLLAPSEOFTHEMINESLOPEABOUT80?SLOPESTABILITYINGEOTECHNICALENGINEERINGRESEARCHHASBECOMEANINCREASINGLYIMPTANTSUBJECTOPENPITSLOPESTABILITYANALYSISISACOMPLEXISSUEOFENGINEERINGMECHANICSCOMPLEXCHANGEABLEITSINFLUENCINGFACTSDIFFERENTMINEHASITSOWNGEOLOGICALENVIRONMENTTHEOCCURRENCEOFDIFFERENTCONDITIONSTOGETHERWITHTHEOPENPITMINESLOPEENGINEERINGOFITSOWNSTATUTEOFLIMITATIONSDEFMABLEDYNAMICACTERISTICSOFITSSLOPEISDIFFERENTFROMTHEOTHERSLOPEGEOLOGICALENGINEERINGSLOPESTABILITYANALYSISOFTHEAREASWHERETHENEEDFMININGOFTHEACTUALGEOLOGICALCONDITIONSINTHEPRODUCTIONPROCESSHASALWAYSBEENONTHESLOPEOFTHEEXCAVATIONBYBLASTINGKEEPACLOSEEYEONTHEIMPACTOFCHANGESTOSTUDYEDGESLOPEDEFMATIONFAILUREOFROCKTHEMEACCURATETODETERMINETHEDAMAGECAUSEDBYSLOPEINSTABILITYDEFMATIONDETERMINETHEMODELTYPEASWELLASTHEFESEEABLECHANGESINTHETRENDOFDEVELOPMENTTHEREFEBETTERUNDERSTINGOFTHEOPENPITSLOPEENGINEERINGGEOLOGICALCONDITIONSOFTHEUNDERSTINGATTHECONCLUSIONOFTHEACTERISTICSOFOPENPITSLOPESLUMPDAMAGEONTHEBASISOFTHESTUDYOPENPITMINESLOPEDEFMATIONMECHANISMOFDESTRUCTIONSLUMPSOUGHTTOUNDERMINETHEOPENPITSLOPEINSTABILITYDYNAMICEVOLUTIONOFQUANTITATIVESCIENTIFICFECASTINGMETHODSTOTHEPREDICTIONOFLSLIDEHAZARDMINESPROVIDEATHEETICALBASISFPREVENTION3UNLOADINGPROCESSTHEPHENOMENONOFRESILIENCEBUTALSOISTHESLOPEDEFMATIONFAILUREOFTHEINITIALPERFMANCEINTHISPROCESSALSOINCLUDESCREEPBUTTHEDEFMATIONOFROCKWITHTHECONSTRAINTTHATPARTOFCANBEFINISHEDTHEENDOFTHERELEASETHEYPRACTICEHASPROVEDTHATTHEREISONLYLOOSEFMOFSLOPEDEFMATIONTHESTRESSSTRAINRELATIONSARESTABLECREEPRUPTURESTAGEPHASEOFDECELERATIONTHISGUARANTEEWILLNOTINCREASETHESLOPEOFSTRESSSTRUCTURALSTRENGTHUNDERTHECONDITIONSOFDECLINETHEDEFMATIONWILLCONTINUETODEVELOPTHESTABILITYOFTHESLOPEWILLNOTCHANGE2PERISTALTICROCKSLOPETOSELFWEIGHTSTRESSINTHESLOPEBASEDLONGTERMEFFECTOFSTRESSUNDERTHEDIRECTIONOFTHEOVERHEADOFTHESLOWCONTINUOUSDEFMATIONKNOWNASTHESLOPEOFTHECREEPWHICHCONTAINSSOMEOFTHELOCALDEFMATIONOFTHEBREAKDOWNGENERATESOMENEWSURFACERUPTUREOFTHESURFACEWITHTHESLOPEOFTHEDEVELOPMENTOFCREEPRELAXATIONCONSTANTPERISTALTICMECHANISMFTHEFMATIONOFTHETABLETSBETWEENROCKSOILSLIDEPLASTICDEFMATIONMICROCRACKSALONGTHEFAULTBYASERIESOFFISSURESINTHEROCKDUETOEXPANSIONPERISTALSISINTHELONGTERMEFFECTSOFSTRESSTHEROCKASLOWADJUSTMENTOFTHEINTERNALDEFMATIONINFACTISONEOFROCKTENDSTOUNDERMINEEVOLUTIONSLOPEOFSHEARSTRESSTHANTHELONGTERMSHEARSTRENGTHOFROCKISLOWCREEPSLOPEWASSLOWONLYWHENTHESHEARSTRESSVALUESCLOSETOABOVETHELONGTERMSHEARSTRENGTHOFROCKTHESLOPEWASACCELERATEDPERISTALSISUNTILTHEDAMAGETHEREFETHEULTIMATEROCKSLOPEDAMAGETOUNDERGOASHTTERMLONGPERIODOFGRADUALEVOLUTIONWHENTHESTRESSOFRAPIDSLOPESLOPEMETHANULTIMATESTRENGTHTHEDAMAGEISSUFFICIENTTOCONSTITUTETHECONNECTINGSURFACESLOPEDAMAGEOCCURSRAPIDLYLOOSENINGCREEPDEFMATIONOFTHETIMEISVERYSHTTHEOTHERHIFTHESLOPEISLESSTHANTHEBODYOFSTRESSULTIMATESTRENGTHISGREATERTHANLONGTERMSTRENGTHTHESLOPEBEFETHETOTALDESTRUCTIONOFALONGERPERIODOFTIMETOGOTHROUGHTHEPROCESSOFRELAXATIONCREEPINADDITIONTHECOURSESHOULDUNDERMINETHEPOWEROFAGREATINFLUENCEONTHESLOPESUCHASWHENANEARTHQUAKETHEPEWATERPRESSURESUDDENLYINCREASEDWHENSOMEOFTHEIGINALCANNOT
      下載積分: 8 賞幣
      上傳時間:2024-03-14
      頁數(shù): 8
      4人已閱讀
      ( 4 星級)
    • 簡介:英文原文ABSTRACTCONSIDERINGTHEACTUALCONDITIONSOFTHEROADWAYDRIVAGEFTHETUNNELROBOTICTHELAWOFCUTTINGENVELOPINGSURFACEMOTIONINSPACEDOESNOTCHANGEALONGWITHIONOFCODINATESROADHEADERLINKCODINATESITSWKCODINATESWEREBINEDTHESPATIALLOCATIONOFCUTTINGHEADCUTTINGENVELOPINGSURFACEWITHTHEGEOMETRICANALYSISOFITSMECHANISMTHEMATHEMATICALMODELOFPROFILINGMEMYCUTTINGBETWEENENVELOPINGSURFACEANGULARSENSSDETECTIONDATAFTUNNELROBOTWASBUILTTHEINFLUENCEFACTSOFCUTTINGROADWAYCROSSSECTIONSHAPEDIMENSIONSUCHASTHEROADWAYSLOPEINCLINATIONLINKMECHANISMWEREDESCRIBEDTHERELATIONBETWEENTHESPATIALLOCATIONOFENVELOPINGSURFACEANGULARDISPLACEMENTWASDESCRIBEDTHEREALTIMERELIABILITYOFTHEMODELWEREVERIFIEDTHROUGHSIMULATINGTHEMOTIONPATHOFPROFILINGMEMYCUTTINGTHISAPPROACHPROVIDESATHEETICALFOUNDATIONFTHEREALIZATIONOFTHEREALTIMEMONITAUTOCONTROLOFTUNNELROBOTCUTTINGROADWAYCROSSSECTIONKEYWDSTUNNELROBOTKINEMATICSCODINATETRANSFMATIONMODELING1INTRODUCTIONROADHEADERISTHEMOSTIMPTANTEQUIPMENTOFMECHANIZEDROADWAYHEAD1THROUGHCUTTINGHEADDRILLINGBOOMSWINGROADHEADERCUTSTUNNELINTOREQUESTEDSHAPETHEPROFILINGMEMYCUTTINGOFROADHEADERCANGETTHETUNNELOFUNIFMGEOMETRYDESIREDSIZEACCDINGTOALANEWAYPROJECTEDDIMENSIONTHEUSELESSTUNNELINGFILLINGQUANTITYISREDUCEDTUNNELINGEFFICIENCYINCREASEDTUNNELDRIVINGCOSTREDUCEDMAXIMALLYECONOMICEFFICIENCYISDRAMATICTOIMPLEMENTTHEAUTOMATIONOFDRIVAGETHEPROFILINGCUTTINGRESEARCHOFBOOMTYPEROADHEADERHASALREADYBEGUNINDOMESTICOVERSEAS27FIG1THEENVELOPINGSURFACE22BUILTTHEKINEMATICALEQUATIONOFTUNNELROBOTPROFILINGMEMYCUTTINGTHEMAINMECHANISMSBOOMOFTUNNELROBOTISMADEUPOFANEWLINEOFARTICULATINGRODSITISACOMPLICATEDMULTIPLEJOINTMECHANICALARMTHESEOPERATINGMECHANISMSHAVETHETREMENDOUSRIGIDITYSOTHEIRDISTTIONWHICHISCAUSEDBYEXTERNALFCEISVERYSMALLTHEREFETHEYSIMPLIFYTHERIGIDARMTOBETHESAMELENGTHASTHEACTUALLENGTHTHEBOOMLIFTINGMECHANISMOFROADHEADERISSIMPLIFIEDINTOTHEROCKERMECHANISMTHEINITIALCONDITIONOFROADHEADERISDEFINEDASTHESTATEOFKEEPINGTHEBOOMOFLONGITUDINALAXISROADHEADERINHIZONTALPARALLELTOROADCENTRALLINES1CUTTINGAGENCIESCUTTINGTHEDRIVEFROMACMOTDRIVENINTHETRANSMISSIONSYSTEMLOCATEDINTHEGENERALPROFILECOUPLINGWITHNOMECHANICALOVERLOADPROTECTIONDEVICETHETWOPLASREDUCERDRIVENSPINDLEFRONTOFTHECUTTINGHEADSOMESECTIONSOFTHEWKINGBODIESBINGMACHINEHASCUTCHAINDISCMILLINGCUTTINGSUCHASCANTILEVERCANTILEVERDUETOTHECUTTINGBINGMACHINEBODYFLEXIBLERELATIVELYSMALLCANCUTAVARIETYOFSHAPESSECTIONSOFTHEROADWAYTOACHIEVEIVECUTTINGBUTCUTTINGGOODEFFECTAHIGHERRATEOFBINGSONOWUSEDMAINLYCANTILEVERCUTTINGHASBECOMEBINGMACHINEWKINGBODYOFABASICPATTERNBYCUTTINGHEADOFTHELAYOUTISDIVIDEDINTOHIZONTALVERTICALAXISOFTHETWOTHELINECUTTINGHEADOFTHEADVANTAGESARETRANSMISSIONCONVENIENTCOMPACTCANBECUTTOANYSHAPEOFTHEPROFILEEASYACCESSTOTHEFMATIONOFACROSSSECTIONISCONDUCIVETOEXPANSIONINTHEUSEOFCANTILEVERDITCHDIGGINGINWATERLOOCUTTINGHEADTHESHAPEOFACYLINDRICALCONETHECONECYLINDRICALASTHELATTERTWOCUTTINGHEADTODRILLINGTHECUTTINGSURFACETHANTHEFMATIONUSEITMETHISISTHEWKOFTHESHTCOMINGSASTHELONGITUDINALAXISOFCUTTINGHEADINTHEHIZONTALSWINGATTHECUTTINGREACTIONFCEISNOTPASSEDMACHINECENTRESWITHCANTILEVEREDFMOFTQUETOBINGMACHINEHAVEAGREATERVIBRATIONSTABILITYISPOTHEREFETHECOALROADWAYEXCAVATIONTHENEEDTOINCREASETHEBODYWEIGHTSUPPTTHEINSTALLATIONOFAUXILIARYEQUIPMENTATPRESENTSUCHABINGMACHINEINSOMESECTIONSOFTHEUSEOFMEBINGMACHINE2SHIPMENTOFBODIESITGENERALLYFROMTHEDLELOADINGCONVEYCOMPONENTSTHEYWEREDRIVENFOCUSMAY
      下載積分: 5 賞幣
      上傳時間:2024-05-21
      頁數(shù): 19
      5人已閱讀
      ( 4 星級)
    • 簡介:英文原文THEANTILOCKBRAKINGSYSTEMANOMALYADRINKINGDRIVERPROBLEMDAVIDDAVIDWWHARLESSHARLESSGEGEGEGEEEHOFFERHOFFERDEPARTMENTOFECONOMICSVIRGINIACOMMONWEALTHUNI_ERSITYBOX844000RICHMONDVA23284USARECEIVED30NOVEMBER2000RECEIVEDINREVISEDFM19FEBRUARY2001ACCEPTED28FEBRUARY2001ANIMPTANTANOMALYWITHTHEINCPATIONOFSAFETYAPPLIANCESINTOMOTVEHICLESISTHEINEFFECTIVENESS–EVENPERVERSEEFFECTS–OFANTILOCKBRAKINGSYSTEMSABSPARTICULARLYASMEASUREDBYFATALCRASHINVOLVEMENTANALYSESOFINSURANCECLAIMSINTHEUSHIGHWAYLOSSDATAINSTITUTE19941995SHOWEDNOCHANGEINCLAIMFREQUENCYAFTERASETOFGMVEHICLESADOPTEDANTILOCKBRAKESIN1992DESPITEENGINEERINGSTUDIESSHOWINGANTILOCKBRAKESRESULTEDINMUCHBETTERBRAKINGPERFMANCEESPECIALLYONWETROADSUSINGTHESAMEGROUPOFGMVEHICLESFARMERETAL1997FOUNDTHATADOPTIONOFABSRESULTEDINME1993–1995CRASHESRESULTINGINTHEDEATHOFANABSVEHICLEOCCUPANTANOTHERGROUPOFVEHICLESTHATADOPTEDANTILOCKBRAKESASEARLYAS1985WEREFOUNDTOHAVEBEENINVOLVEDINBOTHMEFATALCRASHESRESULTINGINTHEDEATHOFANABSVEHICLEOCCUPANTMEINVOLVEMENTSOVERALLTHESEPERVERSEEFFECTSWEREMOSTEVIDENTINSINGLEVEHICLECRASHESUPDATINGTHEEARLIERPAPERWITH1996–1998DATAONTHESAMETWOGROUPSOFVEHICLESFARMER2001FINDSTHATTHEABSEQUIPPEDVEHICLESNOLONGERHADAWSEFATALACCIDENTINVOLVEMENTRATE16THEABSANOMALYHASSPARKEDALARGEPROGRAMOFRESEARCHATTHENATIONALHIGHWAYTRANSPTATIONSAFETYADMINISTRATIONTHEMANYCOMPONENTSOFWHICHAREDESCRIBEDBYGARROTTMAZZAE1999SEVERALEXPLANATIONSHAVEBEENFWARDEDFTHEANOMALYFIRSTCONSISTENTWITHTHERISKCOMPENSATIONHYPOTHESISTHEHIGHERINCIDENCEOFFATALCRASHESCOULDBEDUETOINCREASEDSPEEDAGGRESSIVENESSBYDRIVERSOFABSEQUIPPEDVEHICLESEVANS1995EVANSGERRISH1996SECONDTHEREMAYBEPROBLEMSWITHIMPROPEROPERATIONOFABSEQUIPPEDVEHICLESTHEHIGHERINCIDENCEOFSINGLEVEHICLECRASHESCOULDBEDUETOABRUPTSTEERINGCHANGESBYOFANABSVEHICLEOCCUPANTFEXAMPLEFROMTHEFARSFILESNATIONALHIGHWAYTRAFFICSAFETYADMINISTRATION1997WEOBSERVED328ACCIDENTSINVOLVINGTHEEDABSEQUIPPED1992MODELYEARGMVEHICLELINESDURINGTHEYEARS1993–L9953UNDERANULLHYPOTHESISOFNOCHANGEINSUCHFATALACCIDENTINVOLVEMENTSUPONADOPTIONOFABSWEEXPECT2737SUCHINVOLVEMENTSGIVENTOTALVEHICLEREGISTRATIONSOFTHE1992MODELYEARVEHICLELINESTHEINVOLVEMENTRATEOF1991MODELYEARVEHICLELINESWITHOUTABSTHERESULTINGRISKRATIOOBSERVEDEXPECTEDEQUALS120ONECANPRESENTATESTOFTHENULLHYPOTHESISOFNOCHANGEINTHERATEOFFATALACCIDENTINVOLVEMENTIETHATTHERISKRATIOISNOTSIGNIFICANTLYDIFFERENTFROM10EITHERTHROUGHA95CONFIDENCEINTERVALFTHERISKRATIOACHISQUAREDSTATISTICOBSERVEDEXPECTED2EXPECTEDWITHONEDEGREEOFFREEDOMBRESLOWDAY1987ASINFARMERETAL1997THENUMBEROFFATALACCIDENTSRESULTINGINTHEDEATHOFANABSVEHICLEOCCUPANTIS20HIGHERTHANEXPECTEDDURINGTHE1993–1995PERIODRISKRATIO120X21079P0001ASINFARMER2001THERISKRATIOISNOTSIGNIFICANTLYDIFFERENTFROMONEDURINGTHE1996–1998PERIODRISKRATIO095X2097P03216BIFURCATIONOFTHESEFATALACCIDENTSBYWHETHERTHEDRIVEROFTHEVEHICLEWASDRINKINGALCOHOLHASATREMENDOUSIMPACTONTHERISKRATIOSFACCIDENTSOCCURRINGFROM1993TO1995DRINKINGDRIVERSINABSEQUIPPEDVEHICLELINESHAVE82MEINVOLVEMENTSRESULTINGINTHEDEATHOFANOCCUPANTOFTHEABSVEHICLETHANEXPECTEDGIVENVEHICLEEXPOSURESTHENUMBEROFDRINKINGDRIVERSINVOLVEDINSUCHFATALACCIDENTSINPREABSVEHICLESRISKRATIO182PL6E11BUTFSOBERDRIVERSTHERISKRATIO099ISNEITHERPRACTICALLYSTATISTICALLYDIFFERENTFROMARISKRATIOOFONEINCONTRASTTOTHE1993–1995PERIODBIFURCATIONBYWHETHERTHEDRIVERWASDRINKINGMAKESLITTLEDIFFERENCEDURINGTHE1996–1998PERIODTHERISKRATIOIS092FDRINKINGDRIVERS096FSOBERDRIVERSNEITHERSIGNIFICANTLYDIFFERENTFROMONEHENCEWHENTHEABSANOMALYISOBSERVEDTHEPROBLEMAPPEARSTOBELARGELYCONFINEDTODRINKINGDRIVERSWHENTHEABSANOMALYDISAPPEARSSOTOODOTHEDRAMATICDIFFERENCESINRISKRATIOSBETWEENDRINKINGSOBERDRIVERS4ASIMILARPATTERNEXISTSINTHEANALYSISOFALLFATALACCIDENTINVOLVEMENTSTHEREARE64MEFATALACCIDENTINVOLVEMENTSTHANEXPECTEDFDRINKINGDRIVERSDURING1993THROUGH1995P44E9DURINGTHIS3FARMERETALREPTFINDINGFOURMESUCHACCIDENTSDURINGTHE1993–1995PERIODONEMESUCHACCIDENTDURINGTHE1996–1998PERIODTHESEVERYSLIGHTDIFFERENCESSHOULDHAVENOIMPACTONTHE
      下載積分: 8 賞幣
      上傳時間:2024-03-10
      頁數(shù): 23
      6人已閱讀
      ( 4 星級)
    • 簡介:一、英文原文一、英文原文BOILERCOMPUTERCONTROLBOILERCOMPUTERCONTROLTHEBOILERMICROCOMPUTERCONTROLISANEWTECHNOLOGYWHICHTHERECENTYEARSDEVELOPEDITWASTHEMICROCOMPUTERSOFTTHEHARDWARETHEAUTOMATICCONTROLTHEBOILERENERGYCONSERVATIONSOONSEVERALTECHNICALINCLOSEINTEGRATIONWITHPRODUCTOURCOUNTRYEXISTINGCENTERSMALLBOILERMETHAN300000THECOALCONSUMPTIONACCOUNTEDFOURCOUNTRYRAWCOALOUTPUTEVERYYEAR13ATPRESENTTHEMAJITYINDUSTRYBOILERSTILLWASATTHEENERGYCONSUMPTIONTOBEHIGHTOWASTETHEENVIRONMENTALPOLLUTIONINABIGWAYSOONTHESERIOUSPRODUCTIONCONDITIONENHANCESTHETHERMALEFFICIENCYREDUCESTHECOALCONSUMPTIONCARRIESONTHECONTROLWITHTHEMICROCOMPUTERISHASTHEPROFOUNDSIGNIFICANCETHEWKASTHEBOILERCONTROLDEVICEITSPRIMARYMISSIONISGUARANTEEDTHEBOILERTHESECURITYISSTABLETHEECONOMICALMOVEMENTREDUCESOPERATSLABINTENSITYUSESTHEMICROCOMPUTERCONTROLCANCARRYONTHEPROCESSTOTHEBOILERTHEAUTOMATICDETECTIONTHEAUTOMATICCONTROLSOONMANYFUNCTIONSTHEBOILERMICROCOMPUTERCONTROLSYSTEMGENERALLYISCOMPOSEDBYTHEBELOWSEVERALPARTSNAMELYBYTHEBOILERMAINBODYAMEASURINGAPPLIANCETHEMICROCOMPUTERTHEHAUTOMATICCUTOVEROPERATIONTHEIMPLEMENTINGAGENCYTHEVALVETHESLIPPERYDIFFERENCEELECTRICALMACHINERYSOONPARTIALLYISCOMPOSEDAMEASURINGAPPLIANCETHEBOILERTEMPERATURETHEPRESSURETHECURRENTCAPACITYTHEOXYGENQUANTITYTHEROTATIONALSPEEDISOMETRICTRANSFMSTHEVOLTAGETHEELECTRICCURRENTSOONSENDSINTHEMICROCOMPUTERTHEHAUTOMATICCUTOVEROPERATIONPARTMANUALWHENBYTHEOPERATHCONTROLCONTROLSTHESLIPPERYDIFFERENCEELECTRICALMACHINERYTHEVALVEWITHTHEMANIPULATSOONISAUTOMATICWHENSENDSOUTTHECONTROLSIGNALTOTHEMICROCOMPUTERPARTIALLYTOCARRYONTHEAUTOMATICOPERATIONAFTERTHEEXECUTIONTHEMICROCOMPUTERCARRIESONTHEMONITTOTHEENTIREBOILERMOVEMENTREPTSTOTHEPOLICETHECONTROLGUARANTEEDTHEBOILERISNMALRELIABLYMOVESEXCEPTFTHISFGUARANTEEDTHEBOILERMOVEMENTTHESECURITYWHENCARRIESONTHEMICROCOMPUTERSYSTEMDESIGNTOTHEBOILERWATERLEVELTHEBOILERDOMEPRESSURESOONTHEIMPTANTPARAMETERSHOULDESTABLISHTHECONVENTIONALMEASURINGAPPLIANCETHEALARMDEVICEGUARANTEEDTHEWATERLEVELTHEDOMEPRESSUREHAVETHEDUALEVENTERTIARYALARMDEVICETHISISESSENTIALINDERTOAVOIDTHEBOILERHASTHESIGNIFICANTACCIDENTCONTROLSYSTEMTHEBOILERISAMECOMPLEXCONTROLLEDMEMBERITNOTONLYADJUSTMENTQUANTITYMANYMEOVERBETWEENVARIOUSTYPESQUANTITIESMUTUALLYRELATESMUTUALLYAFFECTSMUTUALLYRESTRICTSBOILERINTERIENERGYCONVERSIONMECHANISMQUITECOMPLEXTHEREFEMUSTESTABLISHAMEIDEALMATHEMATICALMODELTOTHEBOILERQUITETOBEDIFFICULTTHEREFEHASMADETHEBOILERSYSTEMSIMPLIFICATIONPROCESSINGDECOMPOSESISTHREERELATIVELYINDEPENDENTGOVERNINGSYSTEMSCERTAINLYALSOMAYSUBDIVIDEOTHERSYSTEMLIKEAMOUNTOFWINDCONTROLLOOPSINCERTAINSYSTEMSVAPIZATIONEFFICIENCYTHEGUARANTEEPRODUCTIONSAFETYBECAUSETHEBOILERWATERLEVELSYSTEMISEQUIPPEDWITHSINCETHEBALANCETHEABILITYTOCONTROLTHEOBJECTINTHEMOVEMENTHASTHEFALSEWATERLEVELPHENOMENONINTHEPRACTICALAPPLICATIONMAYUSETHEWATERLEVELSINGLEIMPULSETHEWATERLEVELSTEAMQUANTITYDOUBLEWEIGHTTHEWATERLEVELTHESTEAMQUANTITYACCDINGTOTHESITUATIONGIVESTHEWATERVOLUMETHREEIMPULSESTHECONTROLSYSTEMSELIMINATESTHEOXYGENPRESSURETHEWATERLEVELCONTROLPARTIALLYELIMINATESTHEOXYGENTOUSETHESINGLEIMPULSECONTROLPLANSINGLERETURNROUTEPIDADJUSTMENTMONITINGMANAGEMENTSYSTEMMANAGEMENTSYSTEMABOVETHECONTROLSYSTEMGENERALLYCOMPLETESTHECONTROLBYPLCOTHERHARDWARESYSTEMSBELOWBUTMUSTCOMPLETETHEFUNCTIONINONPOSITIONCOMPUTERREALTIMEACCURATELYEXAMINESTHEBOILERTHEMOVEMENTPARAMETERFCOMPREHENSIVELYGRASPSTHEOVERALLSYSTEMTHEMOVEMENTOPERATINGMODETHESUPERVISYSYSTEMTHEREALTIMEMONITTHEGATHERINGBOILERRELATEDCRAFTPARAMETERTHEELECTRICALPARAMETERASWELLASTHEEQUIPMENTRUNNINGSTATUSSOONTHESYSTEMHASTHERICHGRAPHSTEHOUSETHROUGHTHECONFIGURATIONMAYTHEBOILEREQUIPMENTGRAPHTOGETHERWITHTHERELATEDMOVEMENTPARAMETERDEMONSTRATIONINTHEPICTUREINADDITIONBUTALSOCANTABULATETHEPARAMETERFMSOONGROUPINGDEMONSTRATESTHEGENERALIZEDANALYSISPROMPTLYSENDSOUTTHECONTROLCOMMTHESUPERVISYSYSTEMBASISMONITSTHEBOILERPERFMANCEDATAACCDINGTOTHECONTROLSTRATEGYWHICHESTABLISHESSENDSOUTTHECONTROLCOMMADJUSTSTHEBOILERSYSTEMEQUIPMENTTHEMOVEMENTTHUSGUARANTEEDTHEBOILERISHIGHLYEFFECTIVETHERELIABLEMOVEMENT1DIAGNOSESTHEBREAKDOWNWITHTOREPTTOTHEPOLICETHEMANAGEMENTTHEHOSTCONTROLSTHECENTERTOBEALLOWEDTODEMONSTRATETHEMANAGEMENTTHETRANSMISSIONBOILERMOVEMENTEACHKINDOFALARMTHUSCAUSESBOILERSAFEEXPLOSIONPROOFTHESAFEOPERATIONRANKBIGENHANCEMENTATTHESAMETIMETOTHERECDSMANAGEMENTWHICHREPTSTOTHEPOLICEMAYCAUSETHEOWNERREGARDINGBOILERMOVEMENTEACHKINDOFQUESTIONWEAKNESSSOONTOKNOWFROMATOZINDERTOGUARANTEETHEBOILERSYSTEMATICSECURITYRELIABLYMOVESTHESUPERVISYSYSTEMWILLACTACCDINGTOTHEPARAMETERWHICHWILLMONITTOCARRYONTHEBREAKDOWNDIAGNOSISONCEWILLBREAKDOWNTHESUPERVISYSYSTEMPROMPTLYONTHEOPERATSCREENTHEVISUALDISPLAYALARMSPOTREPTSTOTHEPOLICETHECRELATIONDEMONSTRATIONFUNCTIONTOCAUSETHEUSERDEFINITIONTHEDEMONSTRATIONPICTURETORELATEWITHEACHSPOTLIKETHISWHENREPTSTOTHEPOLICEOCCURSTHEOPERATMAYIMMEDIATELYVISITSHOULDREPTTOTHEPOLICETHEEMERGENCYPROCEDURESWHICHDETAILEDINFMATIONDEFERSTORECOMMENDSADOPTSTOCARRYONPROCESSING2HISTICRECDMOVEMENTPARAMETERTHESUPERVISYSYSTEMREALTIMEDATABASEWILLMAINTAINTHEBOILERMOVEMENTPARAMETERTHEHISTICRECDMEOVERSUPERVISYSYSTEMALSOISEQUIPPEDWITHSPECIALREPTSTOTHEPOLICETHEEVENTDIARYWITHRECDSREPTSTOTHEPOLICETHEEVENTINFMATIONOPERATSCHANGETHEHISTICRECDDATABASISOPERATSREQUESTTHESYSTEMMAYDEMONSTRATEISTHESPURTVALUEALSOMAYFSOMEPERIODOFTIMEINMEANVALUETHEHISTICRECDDATAMAYHAVETHEMANYKINDSOFDISPLAYMODEFEXAMPLEDISPLAYMODESOONCURVESPECIFICGRAPHREPTFMINADDITIONTHEHISTICRECDDATAALSOMAYBYAPPLYTAKETHEWKASTHEFOUNDATIONMANYKINDSOFAPPLICATIONSOFTWARE3CALCULATESTHEMOVEMENTPARAMETERTHEBOILERMOVEMENTCERTAINMOVEMENTPARAMETERSCANNOTDIRECTLYSURVEYLIKETHEYEARMOVEMENTLOADTHESTEAMCONSUMPTIONMAKEUPTHEWATERVOLUMETHECONDENSEDWATERRETURNSTOTHEQUANTITYTHEEQUIPMENTACCUMULATIONRUNNINGTIMESOONTHESUPERVISYSYSTEMHASPROVIDEDTHERICHSTARDPROCESSINGALGITHMACCDINGTOMOVEMENTPARAMETERWHICHOBTAINSDERIVEDQUANTITYCALCULATESTHESE
      下載積分: 8 賞幣
      上傳時間:2024-03-14
      頁數(shù): 7
      4人已閱讀
      ( 4 星級)
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      上傳時間:2024-03-14
      頁數(shù): 8
      11人已閱讀
      ( 4 星級)
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