橋上梯形軌枕軌道動力特性分析.pdf

1、西南交通大學碩士學位論文橋上梯形軌枕軌道動力特性分析姓名：馬娜申請學位級別：碩士專業(yè)：道路與鐵道工程指導教師：李成輝20090601西南交通大學碩士研究生學位論文第1I頁AbstractLadderSleeperisthesleeperofnewpatterndevelopedonthebaseofthelongitudinalsleeperComparedwiththetraditionalsleeperLadderSleeperha

2、salotofadvantagesinmanyfacts，SOitattractsmoreandmoreattentionfrommanycountriesTheformerresearchesmostfocusonthestaticforceandfewerondynamic。ThisthesisanalysesthedynamiccharacteristicofLadderSleeperfromthemodalanalysisand

3、theamplitudefrequencyresponseanalysisAccordingtotheformerresearches，thisthesisbuildsRollingstock—Rail—L—adderSleeperBridgemodelreferredtothemechanicalmodelofthetraditionalsleeperThetrackbedandthefastenerissimulatedbythes

4、pringsBasedonthemodel，itanalysestheverticalmodalaboutLadderSleepertogetitsfrequencyandthemodeshapeTherewillbewarpandtwistinLadderSleeperamonghigherordermodevibrationsComparedwiththetraditionalsleeperLadderSleeperhasgoodi

5、ntegrityandtransitivitySOitdoesn’tapplytothemodelwithhalfsleeperThereforethisthesisusesthemechanicalmodelwithwholeLadderSleeperBasedonthemechanicalmodel，thefiniteelemententitymodelisbuiltIntheprogress，rail，LadderSleepera

6、ndbridgeareallsimulatedbythephysicalelementSOthattocorrespondwiththestructureofLadderSleeperandtherealmechanicalmodelpreferablyInorderteducetheelementsasfaraspossible，thestructureispartlysimplifiedduetotheequivalenceprin

7、ciple，inotherwords，thepartswithlittletodowiththetargetoftheanalysisaresimplifiedteducethescaleofthecalculationThenitanalysestheharmonicresponseaboutthetrackusingLadderSleep—erintheballastedtrackabovethebridgetogettherele