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1、學(xué)兔兔www.xuetutu.com第48卷第20期機械工程學(xué)報Vl01．48NO．2O2012年10月JOURNAL0FMECHANICALENGINEERING0ct．2012DoI：10．3901／JME．2012．20．113隨機風作用下高速列車的非定常氣動載荷木于夢閣張繼業(yè)張衛(wèi)華(西南交通大學(xué)牽引動力國家重點實驗室成都610031)摘要：為研究隨機風作用下高速列車的非定常氣動載荷，基于COOPER理論和諧波疊加法計算隨高速列車移動的點的脈動風，分析車速和平均風速對量綱一功率譜密度的影響。采用計算流體動力學(xué)方法數(shù)值計算氣
2、動載荷系數(shù)隨側(cè)偏角的變化規(guī)律，研究隨機風作用下高速列車非定常氣動載荷的計算方法，并推導(dǎo)出非定常氣動載荷的概率分布特性。通過仿真分析車速為200~400km／h，平均風速為t0~35m／s時的脈動風和非定常氣動載荷發(fā)現(xiàn)，量綱一功率譜密度隨車速的增加往高頻部分移動，平均風速的變化對其影響較?。黄骄L速對脈動風速的影響大于車速對脈動風速的影響；當考慮側(cè)偏角的變化時，計算得到的非定常氣動載荷的波動增大；采用準定常法和改進準定常法計算得到的非定常氣動載荷具有隨機過程的遍歷性，而采用權(quán)重函數(shù)法及改進權(quán)重函數(shù)法計算得到的非定常氣動載荷不具有隨
3、機過程的遍歷性。關(guān)鍵詞：脈動風非定常氣動載荷概率分布功率譜密度遍歷性中圖分類號：U292UnsteadyAerodynamicLoadsofHigh—-speedTrainsunderStochasticWindsYUMenggeZHANGJiyeZHANGWeihua(TractionPowerStateKeylaboratory,SouthwestJiaotongUniversity,Chengdu610031)Abstract：Tostudytheunsteadyaerodynamicforcesofhigh-speedt
4、rainsunderstochasticwinds，thefluctuatingwindsofamovingp0shiftingwithhi曲-speedtrainsarecalculatedinthispaperbasedOnCOOPERtheoryandharmonicsuperpositionmethod．Theeffectsoftrainspeedsandaveragewindspeedsonthedimensionlesspowerspectraldensityareanalyzed．Thecomputationalf
5、luiddynamicsmethodisusedtoobtaintheaerodynamicl0adcoe伍cientsatdirentslipangles．Theunsteadyaerodynamicl0adcalculationmethodsforhigh-speedll-ainsunderfluctuatingwindsarestudiedandtheprobabilitydistributionofunsteadyaerodynamicloadsisderived．Thefluctuatingwindsandtheuns
6、teadyaerodynamicloadsofhigh-speedtrainsundertrainspeedsof20O-4O0km／h．a(chǎn)ndaveragewindspeedsof10—35m／sarecalculatedandtheresultsshowthatthedimensionlesspowerspectraldensityismovingtoahigherfrequencyrangewiththeincreaseoftrainspeeds，whiletheaveragewindspeedshavelittleefe
7、ctonit．111eaveragewindspeedshaveamoresignificantimpactonfluctuatingWindsthantheaveragetrainspeedsdo．Whenconsideringfluctuationoftheslipangles，fluctuationoftheunsteadyaerodynamicloadsincreases．Theunsteadyaerodynamicloadsobtainedusingthequasi-steadymethodandthemodified
8、quasi-steadymethodhavethecharacteristicofe~odicityofrandomprocesses．弭theonesobtainedusingtheweightingfunctionmethodandthemodifiedwe
