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1、第3l卷第2期計(jì)算機(jī)仿真2014年2月文章編號(hào):1006—9348(2014)02—0078—05變前掠翼無人機(jī)氣動(dòng)特性和動(dòng)力學(xué)建模與仿真蘇新兵1,周洲1,王旭2,楊健2(1.西北工業(yè)大學(xué)無人機(jī)特種技術(shù)國防重點(diǎn)實(shí)驗(yàn)室,陜西西安710072;2.空軍工程大學(xué)航空航天工程學(xué)院,陜西西安710038)摘要:在無人機(jī)空中氣動(dòng)特性優(yōu)化建模問題的研究中,變前掠翼無人機(jī)具有很復(fù)雜的動(dòng)力學(xué)特性,由于存在固有的氣動(dòng)彈性發(fā)散和變體過程強(qiáng)氣動(dòng)耦合以及力學(xué)環(huán)境的諸多不確定因素,使得無人機(jī)本身的動(dòng)態(tài)特性相當(dāng)復(fù)雜,而利用經(jīng)典牛頓力學(xué)對(duì)單一剛體建模難以清楚反映變體飛行過程的動(dòng)態(tài)響應(yīng)。在介紹
2、變前掠翼布局無人機(jī)動(dòng)特性的基礎(chǔ)上,對(duì)無人機(jī)機(jī)翼變掠過程的5種典型構(gòu)型的氣動(dòng)性能進(jìn)行了數(shù)值計(jì)算,為分析動(dòng)力學(xué)特性提供依據(jù);采用Kane方法建立了機(jī)翼前掠過程中多體動(dòng)力學(xué)系統(tǒng)的數(shù)學(xué)模型,推導(dǎo)了六自由度非線性動(dòng)力學(xué)方程,得到了簡化解耦后的縱向動(dòng)力學(xué)方程并進(jìn)行了仿真驗(yàn)證,結(jié)果表明系統(tǒng)是穩(wěn)定的,可為變前掠翼布局飛行器的動(dòng)力學(xué)分析和飛行控制系統(tǒng)的設(shè)計(jì)提供參考。關(guān)鍵詞:變前掠翼;無人機(jī);多體動(dòng)力學(xué);縱向;氣動(dòng)特性中圖分類號(hào):V211.3文獻(xiàn)標(biāo)識(shí)碼:BSimulationResearchonLongitudinalAerodynamicCharacteristicsandMu
3、tibodyDynamicModelforVFSWConfigurationUAVSUXin—bin91,ZHOUZhoul,WANGXu2,YANGJian2(1.NationalKeyLaboratoryofScienceandTechnologyonUAV,NorthwesternPolytechnicalUniversity,Xi’anShanxi710072,China;2.InstituteofAeronauticsandAstronauticsEngineering,AirForceEngineeringUniversity,Xi’anShanx
4、i710038,China)ABSTRACT:TheeonnaturalaeroelastieitydivergencephenomenaandthestrongaerodynamiceouphngaswellasmanyuncertainfactorsinmechanicalenvironmentCangivetheVariableForward—SweptWing(VFSW)eonfigura-tiouUAVcomplicateddynamics.ItisdifficultusingtheclassicalNewtonianmechanicsmodelin
5、gforsinglerigidbodytoclearlyreflectitscomplexdynamiccharacteristicsinchangingwing.BasedonintroducingtheVariableForward—SweptWing(VFSW)configurationUAV,theaerodynamiccharacteristicswerenumericallycomputedforVFSWair-craftsunderthefivetypicalflightpose.a(chǎn)nditsresultsCanprovidedatafounda
6、tionfordynamicsanalysis.Thesixde—greesoffreedomnonlineardynamicfunctionsofthemorphingaircraftinthemorphingprocesswerederivedusingtheKanemethodofthemultibodydynamicstheory.Inaddition,thedecoupledlongitudinaldynamicfunctionwaspresen-tedbysimplification.Thenthepulseandsaltationresponse
7、oflongitudinalpitchingguiseweresimulated.TheresultsCanvalidatetheavailabilityandaccuracyofthedynamicmodel,andprovidereferencesforthedynamicsinvestigationandflightcontrolsystemdesignforVFSWconfigurationUAV.KEYWORDS:Variableforward—sweptwing(VFSW);Unmannedaerialvehicle;Multibodydynami
8、cs;Longitudi-hal;Ae