氣體環(huán)境下雙壁碳納米管振蕩器的能量耗散.pdf

1、東南大學(xué)碩士學(xué)位論文氣體環(huán)境下雙壁碳納米管振蕩器的能量耗散姓名：李健申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：機(jī)械設(shè)計(jì)及理論指導(dǎo)教師：陳云飛陳敏華20090412AbstractMolecularDynamicsSimulationoftheDouble、№UCarbonNanotubeOscillatorVibrationinGasEnvironmentByLijianSupervisedbyChenYunfeiandChenMinhuaMechani

2、calEngineeringDepartment，SoutheastUniversityAbstractThemechanicaloscillatorybehaviorsofmultiwallcarbonnanotubeoscillatorsingaseousenvironmentandinvacuumconditionwereinvestigatedusingthemoleculardynamicsmethodThemodeledca

3、rbonnanotubeoscillatorsinvacuumwasdemonstratedtheoscillatoryphenomenonofcarbonnanotubeoscillatorsThedisplacementcurveoftheinnertubeandthevariationoftherestoringforcewiththeelapseofthetimeweregottenItshowedthattheinnertub

4、evibratesalongaxialdirectionwiththeamplitudedecaying，andthedirectionofrestoringforcechangedperiodicallybutitsmagnituderemainsTheinfluenceofsystemtemperatureandthecommensuratesituationbetweentheinnerandtheoutertubesonvibr

5、ationcharacteristicandenergydissipationofthedoublewallnanotubeoscillatorwereanalyzedWealsoproposedthecalculationmethodoftheintertubefrictionforcethroughevaluatingthedissipatedenergyThephysicalmodelofthecarbonnanotubeosci

6、llatorundergaseousenvironmentwassetuptoinvestigatetheinteractivemechanismbetweenthegasatomsandthecarbonnanotubeoscillatorsTheeffectsofambientgasdensityandtemperatureonintertube丘ictionalforceandoscillationfrequencywereana

7、lyzedItWaSfoundthattheintertubefrictionalforceincreaseswiththeambientgasdensityandtemperatureThehighergasdensityandtemperaturecauseamorerapiddecayintheoscillationamplitudeandallincreaseoftheoscillationfrequency。Comparedt

8、ovacuumenvironmentalcondition，thecollisionbetweengasatomsandthenanotubewallsisamainingredientleadingtotheincreaseoftheenergydissipationGasdampingmaybethemainreasonforthefailureofcarbonnanotubeoscillatorsworkingingasenvir