2023学年完整公开课版ISTA China Symposium

MeasurementandAnalysisofShockandVibration

DuringCargoHandlingOperationintheAirportMasahiroTakagi,eXcearchCorporation(Japan)BackgroundAirShipment(NCA:NipponCargoAirlines)Shock/vibrationsusceptibleproductssuchasprecisionequipmentneedtobetransportedbyairshipment.However,mostshippersdonotknowdetailsaboutshock/vibration

duringcargohandlingfortheirairshipment.PurposeQuantitivelymanagehandlingquality.Shippersareabletoutilizethequantitativedatafortheirprotectivepackagingdesign.*

Damagefreeshipment*IncreasecustomersatisfactionPurposeQuantitivelymanagehandlingquality.Shippersareabletoutilizethequantitativedatafortheirprotectivepackagingdesign.*

Damagefreeshipment*IncreasecustomersatisfactionDataMeasurement“Dummy”WoodenCrate(300kg)VideoShooting10HandlingScenes(DemoOperation)3levelsof“handlingroughness”FieldDataRecorderSAVER3X90(Lansmont)AccelerationMeasurement/AnalysisShockWatchUpper(NearShockWatch)BottomAUpperBottomBDummyWeightLateralSAVERSettingSamplingRate:1,000Samples/Sec(Hz)EventRecordingTime:1.024SecAccelerationF/S:50G’sLow-passFilter:500HzFieldDataRecorderSAVER3X90(Lansmont)10HandlingScenes(3levelsof“handlingroughness”)1.Unloadpackagefromtruck2.Forkliftdrivingandhandling3.Loadpackagetopallet4.Movepallettodolly5.Dollydriving(fromwarehousetooutside)10.Movepalletinsidetheaircraft9.Loadpallettotheaircraft8.Movepallettomaindeckloader7.Dollygoandstop6.Dollydriving(bump)AccelerationTimeHistoryDistributionbyHandlingRoughness(AllScenes)RoughStandardGentleAccelerationF/S:+40G’sAccelerationhazardcansignificantlybereducedbymanaginghandlingquality.VerticalLateralLongitudinalElapsedTimeElapsedTimeElapsedTimeMax.Acceleration

ofAllScenesandHandlingRoughness*Forthescene#5,thepackagewasmovedtowardthe“Lateral”direction.*Forthescene#6,thepackagewasmovedtowardthe“Lateral”direction.*Forthescene#7,thepackagewasmovedtowardthe“Lateral”direction.*Forthescene#10,thepackagewasmovedtowardthe“Lateral”direction.10EventswithHigherAccelerationHigheraccelerationsobservedduringdollyandforkliftoperations.ForkliftDrivingandHandlingRoughStandardGentleAccelerationF/S:+40G’sHighestaccelerationobservedwhenthecratewasroughly“dropped”ontothefloorbyforklift.VerticalLateralLongitudinalElapsedTimeElapsedTimeElapsedTimeDollyDriving(onBump)RoughStandardGentleMorethan10G’sobservedevenwiththe“Standard”operation.AccelerationF/S:+40G’sVerticalLateralLongitudinalElapsedTimeElapsedTimeElapsedTimeDollyDriving(onBump)RoughStandardGentleAccelerationF/S:+40G/-30G’sVerticalLateralLongitudinalVerticalLateralLongitudinalVerticalLateralLongitudinalMorethan10G’saccelerationobservedevenwiththe“Standard”operation.TimeTimeTimeDollyDriving(Bump):PSDComparisonbyHandlingRoughness(Vertical)DollyDriving(Bump):PSDComparisonbyHandlingRoughness(Vertical)HigheraccelerationbyRoughhandlingcanbereducedwithStandard/Gentlehandlings.Theeffectisconfirmedasthereducedpowerlevel(especially10Hzandhigherfrequency).EventhoughtheroughhandlingPSDseemstohavelowerpowerascomparedwithISTA2A’sPSDprofile,weneedtobecarefulsincethedollyoperationusuallycontainsalotof“repetitiveshock”typeeventsandthehigheraccelerationpropertytendtobe“averagedout”inthePSDprocess.DollyDriving(Bump):AccelerationComparisonbyLocationRoughBottom(A)Upper(NearShockWatch)VerticalLateralLongitudinalVerticalLateralLongitudinalAccelerationF/S:+40G/-30G’sTimeTimeDollyDriving(Bump):AccelerationComparisonbyLocationWhenmorethan35G’sverticalaccelerationwasimposedtothebottomofthecrate,onlyabout10G’sverticalaccelerationwasmeasuredattheupperside(nearShockWatch).Itisnotstrangeconsideringthefactthatthematerial(wood)andthestructuregiveattenuationeffecttothesystem.ShippersneedtounderstandthattheaccelerationlevelimposedatthebottomoftheircrateswouldbemuchhigherthanwhatShockWatchsensed.SummaryandFuturePlanItwasconfirmedthattheaccelerationhazardcansignificantlybereducedbymanaginghandlingquality.Wealsoobtainedinsightsabouthowtomanageit.NCAisgoingtoutilizethemovieanddata;ToexplaintocustomersthathowmuchNCAcaresitshandlingquality.Toconducteffective(andpersuasive)employeetraining.Toprovidecustomerswithnecessaryinformationfordesigningsuitableprotectivepackaging.