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时间:2019-11-26
《多控制面飞机的全机颤振主动抑制设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第31卷2010年第8期8月航空学报ACTAAERONAUTICAETASTRONAUTICASINlCAV01.31No.8Aug.2010文章编号:1000一6893(2010)08—1501一08多控制面飞机的全机颤振主动抑制设计杨超1,宋晨1,吴志刚1,张瞿辉2(1.北京航空航天大学航空科学与工程学院,北京100191)(2.成都飞机设计研究所技术中心,四川成都610092)ActiveFlutterSuppressionofAirplaneConfigurationwithMultip
2、leControlSurfacesYangCha01,SongChenl,WuZhigan91,ZhangQuhui2(1.SchoolofAeronauticScienceandEngineering,BeijingUniversityofAeronauticsandAstronautics,Beijing100191,China)(2.TechnicalCenter,ChengduAircraftDesign&ResearchInstitute,Chengdu610092,China)摘要:
3、以仿F/A-18A外形的全机模型为对象,研究多输入/多输出(MIMO)飞机颤振主动抑制(AFS)设计方法和特点。控制律采用线性二次型高斯(LQG)方法。结合平衡截断法降阶。首先,仅用机翼舵面对机翼部件和全机设计AFS控制律;然后,全动平尾参与AFS控制;最后,机身额外加装小翼,与机翼舵面联合控制,考察AFS效果。研究发现:单独机翼AFS效果显著,颤振速度提高28%;全机构型有机身模态参与颤振,仅用机翼舵面,低阶控制律颤振速度增量仅为4.6%;全动平尾参与控制可改善低频颧振,但存在低速的高频不稳定
4、模态;机身小翼与机翼舵面联合控制,AFS控制效果可达14.9%。最终,筛选出机翼后缘内侧舵面与机身小翼两组控制面进行AFS设计,即可达到14.5%的颤振速度增量,是较为理想的AFS方案。关键词:气动弹性;颤振主动抑制;最优控制;模型降阶;平衡截断中图分类号:V215.3文献标识码:AAbstract:Activefluttersuppression(AFS)ofamulti—input/multi—output(MIMO)airplaneconfigurationisstudiedonanimi
5、tationalF/A-18Amodel.ThecontrollersaredesignedbylinearquadraticGaussian(LQG)methodtruncatedbyabalancedtruncationmethod.First,bymerelyusingthewingflaps,theAFSofthewingandtheairplaneareperformed.Then,all—movinghorizontalempennageareinvolvedintoflutterc
6、ontr01.Fi—nally,apairoffuselageflapsiscombinedwiththewingflapsforAFS.ItisfoundthattheAFSofthewingiseffectivewiththeflutterspeedincreasingby28%.However,theincrementisonly4.6%fortheairplanebe—causeofthefuselagemodescouplingintoflutter.Theadditionofall-
7、movinghorizontalempennagecanimprovelow-frequencyflutter,butitcanalsocauselow-speedhigh-frequencyinstability.Combiningthefuselageflapswiththewingflapscanincreasetheflutterspeedby14.9%.Finally。thetrailing-edgein-boardflapsandthefuselageflapsareselected
8、toachievea14.5%flutterspeedincrement,whichisasatisfactoryAFSdesign.Keywords:aeroelasticity;activefluttersuppression;optimalcontrol;modelreduction;balancedtruncation颤振是一种气动弹性动力学不稳定现象,真实飞行器的颤振会导致灾难性后果,因而倍受关注。颤振主动抑制(AFS)可以不显著增加结构质量,提高临界稳定速度,是当今国内外普通推崇的颤
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