建立了全承載式大客車(chē)車(chē)身骨架的有限元模型，對(duì)車(chē)身骨架結(jié)構(gòu)進(jìn)行了振動(dòng)模態(tài)和靜力學(xué)分析。然后對(duì)車(chē)身骨架結(jié)構(gòu)進(jìn)行設(shè)計(jì)參數(shù)靈敏度分析，得出車(chē)身骨架扭轉(zhuǎn)剛度和一階扭轉(zhuǎn)頻率對(duì)各部件設(shè)計(jì)參數(shù)的靈敏度。在此基礎(chǔ)上，以車(chē)身骨架桿件厚度為設(shè)計(jì)變量，通過(guò)兩階段結(jié)構(gòu)優(yōu)化設(shè)計(jì)，在整車(chē)骨架質(zhì)量增加很少的條件下，提高了整車(chē)結(jié)構(gòu)的扭轉(zhuǎn)剛度和一階扭轉(zhuǎn)頻率值;同時(shí)，一輪懸空工況下的整車(chē)結(jié)構(gòu)應(yīng)力峰值明顯下降，應(yīng)力分布更加均勻，整車(chē)骨架結(jié)構(gòu)設(shè)計(jì)更為合理。
關(guān)鍵詞:大客車(chē);車(chē)身結(jié)構(gòu);有限元分析;優(yōu)化設(shè)計(jì)
[A bst rac t]Afiniteelementmodelforthebodyframeofintegralbusisbuiltandthevibartionmodalanalysis
andstaticanalysisare PerfOrmedonbodyframestructure.Thenlhesensitivitiesoftorsionalstifnessandfirst一order
torsionalvibrationfrequeneytodesi，paramete鄺ofbodyframeare obtainedbysensitivityanalysis.onthisbasis
twostagesofoptimizationdesi，are performedwiththesectionsizesofframebarsasdesignvariabIes.Asaresult，
thetorsionalstifnessandl吐ordertorsionalvibrationfrequencyareraisedwithonlysIightincreaseinframemass，In
addition，thepeakstressofthewholebodystructureintheconditionofonefrontwheelsuspendedis腳atlyreduced
withevenerstressdistributionandthedesignofwholebodyframestructuretendstobemorerational.
Ke yw or ds:bsu;bodystructure;FEA;oPitmaldesign