摘要平头轻型载货汽车大多是由国外引进的老车型，这些车型设计时并没有过多考虑其碰撞安全性，因此在碰撞安全性方面存在先天不足，缓冲吸能区间小，碰撞安全性能差。由于货车碰撞试验在我国还属于开始阶段，关于货车的碰撞安全法规也没有出台，进行大规模的货车碰撞试验的条件还不成熟。针对这一情况，本文在参考大量国内外资料与实验的基础上，对货车正面碰撞进行虚拟试验研究，并且针对原始设计存在的碰撞安全性缺陷，设计了压溃杆式缓冲吸能装置，并对平头驾驶室局部结构做了相应改造，虚拟碰撞结果表明改进后的驾驶室碰撞安全性有了显著提高；在此基础之上，对不同的缓冲吸能设计进行了对比研究和优选。关键词：平头轻型货车，碰撞安全性，正面碰撞，缓冲吸能ABSTRACTMosttypesoftheflat-facelighttruckareoldmodelsintroducedfromabroad.Thecrashworthinessisnotconsideredenough,thebufferingandenergyabsorbingsectionisstraitandthecrashworthinessisbad,thusthecrashworthinessofthemareincongenitaldeficiency.Forthetestoftruckcrashingisattheinipientstageinournationandthelawrelatedtoitisnotpublishedyet,thequalificationfortakingmassivectashingtestisnotmature.Aimingatthissituation,thisthesishastakendummytestresearchofthetruck,sfrontimpactonthepreconditionofconsultingmanyinformationandexperimentfromhomeandabroad，thenthedummycrashingtestandsecurityevaluationofithasbeendonebymethodofnonlineardynamics.Aimedattheformerdesign,scrashingsafetydefects,theenergy-absorptiondevicewiththecollapse-tubehasbeendesignandthecorrespondingsubstructureofthecabhasbeenimproved.Thecab,scrashingsecurityhasbeenincreasednotablyshownfromthedummycrashingtestresult.Atlast,thedifferenceenergyabsorptiondevicehasbeencomparativestudiedandoptimized.Keyword:flat-facelighttruck,crashworthiness,frontimpact,energy-absorptioncapability目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc215567897"摘要PAGEREF_Toc215567897\hIHYPERLINK\l"_Toc215567898"ABSTRACTPAGEREF_Toc215567898\hIIHYPERLINK\l"_Toc215567899"HYPERLINK\l"_Toc215567900"第1章绪论PAGEREF_Toc215567900\h1HYPERLINK\l"_Toc215567901"1.1课题的背景与意义PAGEREF_Toc215567901\h2HYPERLINK\l"_Toc215567902"1.1.1背景PAGEREF_Toc215567902\h2HYPERLINK\l"_Toc215567903"1.1.2意义PAGEREF_Toc215567903\h2HYPERLINK\l"_Toc215567904"1.2国内外汽车碰撞安全法规概述PAGEREF_Toc215567904\h2HYPERLINK\l"_Toc215567905"1.2.1国外汽车碰撞安全法规PAGEREF_Toc215567905\h3HYPERLINK\l"_Toc215567906"1.2.2国内汽车