液壓樁錘沖擊機構的瞬態(tài)動力特性及沖擊性能研究.pdf

1、中南大學碩士學位論文液壓樁錘沖擊機構的瞬態(tài)動力特性及沖擊性能研究姓名：王濤申請學位級別：碩士專業(yè)：機械設計及理論指導教師：胡均平20100603中南大學碩士學位論文ABSTRACTHydraulicpilehammerisapile—drivingmachine，whichhaslownoise，nopollution，smallvibrationandhighimpactenergyNowhydraulicpilehammerinth

2、eforeigncountryhasbecomeaseriesButinchina，thetechniqueofhydraulicpilehammeriSrelativelybackwardsThereisnomanufacturerindesigningandproducingitlarge—scale，SOmostofthehydraulicpilehammersareimportedfromothercountriesTherea

3、remanyevaluatingindicatorsforpilehammerwhichthelargestimpactforce，theimpactefficiencyandimpactnoiseisveryimportantButmanyHydraulicpilehammersproducedinourcountryaresmallimpactforce，lowimpactefficiencyandhighimpactnoiseSo

4、thispaperisabasedontheimpactstructure，whatarecomposedofhammerhammercrashpad，pilecap，pilecrashpadandpile，analyzedtheinfluenceoffactorforthethreeindicators，andthenoptimizethemFirst，abasedontheimpacttheoryofNewton，thispaper

5、hasobtainedanewsolutionmodelforimpactstructurewecanobtainaordinarydifferentialequationforthismodel，andsolveit，andwecanknowtherelationshipoflengthofpenetrationandparametersThenusingthetransferfunctiontooptimizetheparamete

6、rs，andobtainthebestparametersatthespecialsoilThen，thispaperanalysisitwithwavemotiontheoriesAccordingtodifferenthammershape，wecanobtaintherelationshipbetweenhammerwavedragandimpactforce，thenknowwhatshapeofhammerweshouldse

7、lectUsingthetheoryofSmith，wecanobtainthedisplacementrelationalatanylocationAccordingtodifferentsoil，thispaperhasanalyzedthebackwaveatthebottomofthepileThesecanbereferencedforpiletestThepaperhasusedANSYS／LS—DYNAtosimulate

8、forthesingledynamicimpactstructureWecarlobtainthestresschangecurveanddisplacementchangecurve，calculatetheimpactefficiencyandthenanalysistherelationshipbetweencrashcapparameterandimpactefficiencylengthofpenetration，thelar