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簡介：航空發(fā)動機葉片截面航空發(fā)動機葉片截面特征特征參數(shù)參數(shù)提取提取技術(shù)技術(shù)研究研究RESEARCHOFTHEAEROENGINEBLADECROSSSECTIONALFEATUREPARAMETERSEXTRACTION學科專業(yè)儀器科學與技術(shù)研究生馬雯琦指導(dǎo)教師劉書桂教授天津大學精密儀器與光電子工程學院二零一三年十二月摘要近年來，隨著航空事業(yè)的不斷發(fā)展進步，航空發(fā)動機葉片檢測逐漸成為一個熱點問題。由于發(fā)動機葉片曲面復(fù)雜，數(shù)量多，葉片彎扭程度大，檢測起來比較困難。而且發(fā)動機葉片的工作環(huán)境非常惡劣，在工作過程中需要承受高溫，高壓，因此，保證葉片的加工質(zhì)量至關(guān)重要。另外，每年因發(fā)動機葉片質(zhì)量問題而發(fā)生的航空事故在整個事故發(fā)生原因比重中也占有不小的分量，因此，葉片的質(zhì)量檢測與保證對于整個發(fā)動機來說具有決定性的地位。對于葉片型面的檢測主要針對的是葉片的各個截面參數(shù)，如前后緣，弦長，最大葉型厚度等，基于此，本文提出葉片截面參數(shù)的各個提取算法，并加以實驗驗證，說明算法的可行性，本文主要包括以下幾個方面1葉片型面檢測的測量點獲取方法。本論文基于對于葉片截面參數(shù)提取技術(shù)的研究，采用UG建模軟件建立發(fā)動機葉片三維模型，在模型的基礎(chǔ)上，利用UG方便的二次開發(fā)工具，對葉片模型進行測量路徑規(guī)劃和測量點的獲取，得到測量數(shù)據(jù)以進行參數(shù)提取。2研究各個葉片截面參數(shù)的相應(yīng)提取算法，并給以算法實現(xiàn)說明。首先依據(jù)中國航空工業(yè)標準給出各個截面參數(shù)的有關(guān)定義及圖解，介紹利用葉片UG模型獲取測量數(shù)據(jù)的方法，接下來介紹各個參數(shù)提取所采用的算法說明，包括前后緣圓心及半徑，前后緣厚度，弦線角及弦長，中弧線，最大葉型厚度等。3對葉片截面參數(shù)提取算法進行精度驗證?；诘谌滤撌龅母鞣N參數(shù)提取算法以及測量點獲取方法的理論，通過UG，MATLAB等軟件實現(xiàn)了數(shù)據(jù)獲取、參數(shù)提取的過程，并介紹了UG二次開發(fā)語言O(shè)PENGRIP在獲取測量點過程中的用法，隨后對兩個截面數(shù)據(jù)進行參數(shù)提取的研究，根據(jù)理論結(jié)果與計算結(jié)果的誤差值進行算法精度驗證，對算法精確度進行一個評價與分析，最后對葉片測量數(shù)據(jù)圖形進行直觀展示。關(guān)鍵詞關(guān)鍵詞葉片檢測測量點獲取參數(shù)提取最優(yōu)算法

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簡介：中國民航大學碩士學位論文航空貨運裝載問題算法設(shè)計與研究姓名張劼申請學位級別碩士專業(yè)計算機應(yīng)用技術(shù)指導(dǎo)教師衡紅軍20070317中固民航人學顧I。學位論文ABSTRACTWITHSTEADYDEVELOPMENTOFGLOBALECONOMYANDINTERNATIONALTRADE，AIRTRANSPORTATIONWILLGROWRAPIDLYIMPROVINGAIRCRAFTCARGOHOLDUTILIZATION，ISASIGNIFICANTAPPROACHTOBOOSTECONOMICBENEFITAIRCARGOLOADINGPROBLEMRESEARCH，PLAYSANIMPORTANTROLEINPROPELLINGAIRLOGISTICDEVELOPMENT，ANDHASACADEMICANDPRACTICALVALUECONSIDERINGTHECHARACTERTHATAIRCRAFTCARGOHOLDSPRESENTARCAIRCARGOLOADINGPROBLEMISPRAISEDTHEBULKLOADINGMETHODWHICHBELONGSTO1DIMENSIONLOADINGPROBLEMISINTRODUCED，ITISMAINLYUSEDUNDERSIMPLEPACKINGCIRCUMSTANCE，ANDPROVIDESCURSORYPROJECTFORTHEBU墩LOADINGPROBLEMWIDEBODYAIRCRAFTULDUNITLOADINGDEVICELOADINGMETHODSWHICHBELONGTO3DIMENSIONLOADINGPROBLEMAREPROVIDEDTHELOADINGARRANGEMENTISBUILTUPINLAYERSFROMTHEBOTTOMUPWARDS，BOXESORGANIZEDINLAYERSFILLINTOULDSFIRST，LAYERSHEIGHTISGENERATEDBYHEURISTICRULES，THENLAYER’SWIDTHISDETERMINEDACCORDINGTOTHESITUATIONOFAIRCRAFTCARGOHOLDORULDSDYNAMICALLYLAST2DIMENTIONLOADINGMETHODSAREUSEDTOFILLTHELAYER2DPACKINGEMPLOYSTWOKINDSOFHEURISTICSONEISFINDCONTOURALGORITHM，PACKINGSPACEISCOMPOSEDOFASERIESOFCONTOURLINES，ITGENERATEPOSITIONSOFCARTONS，COMBINEANDDECOMPOSECONTOURLINESINTERMSOFHEURISTICRULES；ANOTHERISSTRIPBUILDALGORITHM，PACKINGSPACECONSISTSOFHORIZONTALORVERTICAISTRIPSWHICHWIDTHISDETERMINEDBYHEURISTICRULES，THENPACKSITEMSINTOSTRIPSWITHKNAPSACKALGORITHMTHEFORMERALGORITHMCATERSFORWEAKLYSTRONGLYHETEROGENEOUSINSTANCES，ANDPRESENTSLOWCOMPUTATIONALTIMEANDSPACE，WHILETHELATTERCANPERFORMMOREOPTIMALSOLUTIONSFORGENERALWEAKLYHETEROGENEOUSINSTANCES，BUTSPENDSMUCHTIMEANDSPACECOSTWASTESPACEISDECREASEDBYHEURISTICRULES，BOTHSPACEANDWEIGHTUTILIZATIONARETAKENINTOACCOUNTTHEPACKINGSHAPECATERSFORCARGOHOLDS’CONTOURPREFERABLYANDACHIEVESMOREOPTIMALSPACEANDWEIIGHTUTILIZATION，ITPROVIDEANEWAPPROACHFORWEEKLYHETEROGENEOUSPROBLEMSCOMPREHENSIVETESTSPROVIDEAMOREDETAILEDANDPOWERFULPICTUREOFGUIDINGPRACTICALLOADINGWORKTHESOLUTIONOFNUMERICALEXAMPLESCOMPADNGBYOTHERCLASSICALGORITHMSSHOWSTHATTHISAPPROACHISMOREEFFECTIVETHANOTHERSKEYWORDSHEURISTIC，LOADING，PACKING，BUILDUPBULK，ULD