商用车龙门架结构优化设计

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中图分类号：U463 DOI：10.20042/j.cnki.1009-4903.2026.01.006

Optimization DesignofCommercial Vehicle GantryStructure

Abstract：Aimingatthecrackingproblemofthecabgantryofacertaincommercialvehicleduringroadtests，thispaperadopts CAEtechnologyforfaultdiagnosisandoptimization.Ahigh-precisionfiniteelementmodelwithwelddetailswasestablishedvia3D scanning，anddyamicsiulatioascarredoutinombinationwiththactualladspectrumtolocatethstressoncetrationarea andidentifythathemaincausesofcrackingarestressconcentrationinducedbystructuralmutationanddynamicresonance.Taking stresseductionandnaturalfrequencyimprovementastheobectivesanimprovedschemecombiningtopologyoptimizationandshape optimizationwasproposed.Simulationandstrengthenedroadtestverificationshowthatemaximumstressoftheoptimizedgantryis reduced by 26.4% ，thecrackingproblemissolved，whichprovidesareferenceforthedurabiltydesignofsimilarstructuralcomponents. KeyWords：Commercialvehicle；Gantrystructure；Fatiguecracking；Dynamicsimulation；Structuraloptimization；Modalanalysis

0 引言

商用车龙门架是保障挂车电器系统、制动系统连接可靠性的关键支撑结构。（剩余3217字）