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1、RUCKSUSPENSIONSYSTEMOPTIMIZATIONINTRODUCTIONTrucksuspensionsystems,hardwareinnovationsforimprovements,analyticalinvestigationstoimprovedesign,techniquesfortesting,andcomputersimulationtopredictperformancehavebeendescribedinnumerousprevioustechnicalpapers.Manyoftheseinvestigator
2、shavebeenseeking,insomesense,thatelusivedesignwhichmightbetermedanoptimumsuspensionsystem.Thedifficultyassociatedwithobtaininganoptimaldesignisprimarilyduetothedifficultyofdeterminingtheoperatingenvironment(input)andarealisticfigureofmeritorcriterionforoptimization(output).Thef
3、undamentalpurposeofavehiclesuspensionsystemistoactasavibrationisolationsystembetweentheframe,chassis,passengers,andcargo,andthevibratoryinputcausedbyroadorterrainirregularities.Thelackofafirmdeterministicdefinitionoftheprofiletowhichavehicleissubjectedthroughoutitslifetimerequi
4、resastatisticalapproach,thatofrandomvibration.Theauthorandothers,forexample,havepreviouslymadesomeprogressinthestatisticaldefinitionoftheinput.Itappearsthatafairlyrealisticapproximationofroadorcross-countryterraincanbemadebyassumingawhite(equalprobabilityofallfrequencies)Gaussi
5、andistributionfortheslope(orfirstspecialderivative).Thiscanthenbeconvertedtoatemporalinputforvehiclevibrationstudiesbyaccountingforthespeedofthevehicleandtheinterrelationsassociatedwithfollowingin-linewheels.Themeasureofthevibratoryresponseoroutputusuallyassociatedwithrandomvib
6、rationismeansquareacceleration.Studieshaveindicatedthattheproperfrequencydomainweightingofmeansquareaccelerationtoaccountforhumanresonancescanyieldacriterionwhichcorrelateswiththesubjectivesensationofhumancomfort.Sinusoidalandrandomtestspecificationsforcomponentsandcargo,forexa
7、mple,areusuallyassociatedwithaccelerationlevels.Fromthestandpointofcomponentfatiguefailurethereareindicationsthatarmsmeasurementofstresswillyieldarealisticcriterioninarandomenvironment.Thus,itappearsthataproperlyidentifiedrandominputtogetherwiththeproperselectionofameansquareou
8、tputmightbeusedasatechniqueforoptimizationoftrucksuspe
