内凹结构隔振性能研究

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中图分类号：0328 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202305052

Abstract：Inviewofthelightweight，smallspaceandsmallamplituderequirementsofelectronicequipmentforvibrationisolation structure，thepaper focusesontheisolationoflowfrequencyvibrationfromitsbase.Byintroducingthecrossbracedconfigura tion，aconcavecrossbraced platemodelisproposed，theinfluencelawofstructuralparametersonitslowfrequencyvirationisolationperformance isillustrated.Then，basedonthedesignconceptofcross-bracing，aconcavesandwichphononiccrystalstructure modelis proposedndtheinfuencemechanismofgeometricparametersonitsfrequncyesponsecharacteristicsisevealedAf tergeometric parameteroptimizationandexperimentalverification，thevibrationisolationstructure modelhasexcellentvibration attenuationcharacteristicsinthelowandwidefrequencyband.In1Oo～5ooHz，theatenuationeficiencyofaccelerationpower spectral density above 70% . In 35～80Hz ，and 500～2000Hz ，the attenuation eficiency of acceleration power spectral density above 40% .Working displacement of the vibration isolation structure under 3 times standard deviation confidence is less than （20 3mm .Therefore，itissuitablefortheisolationoflowfrequencyrandomvibration.Inaddition，themodelhas broadapplication prospectsowing to its advantages oflight weight，smallvolume，large bearing capacityand strong universality.

Keywords：lowfrequencyvibration isolation;phononiccrystal;negativePoison’sratio;concavestructure;crosbraced

负泊松比结构由于其独特的变形特性、优异的抗冲击及能量吸收特性，被广泛应用于航空航天、车辆、船舶等领域[1-2]。（剩余11429字）