航空科学技术
航空科學技術
항공과학기술
AERONAUTICAL SCIENCE AND TECHNOLOGY
2014年
6期
22-27
,共6页
大型运输机%大展弦比机翼%气动弹性%颤振%随动推力
大型運輸機%大展絃比機翼%氣動彈性%顫振%隨動推力
대형운수궤%대전현비궤익%기동탄성%전진%수동추력
large transporter%large-aspect-ratio wing%aeroelasticity%lfutter%follower thrust
分析了带翼吊发动机的大展弦比机翼颤振特性，其中考虑了机翼大变形和发动机推力的作用。采用梁单元对双梁式机翼和发动机吊舱进行了结构建模，采用修正的片条理论计算曲面定常气动力，修正的Theodorsen方法计算曲面非定常气动力，发动机推力始终沿发动机轴线。研究机翼在不同攻角时的定常气动力及发动机推力联合作用下固有振动和颤振特性的变化情况。结果表明，发动机推力对机翼静变形和固有频率改变不大，但对颤振临界速度的变化量不容忽视，有可能成为大型运输机机翼设计的限制因素。
分析瞭帶翼弔髮動機的大展絃比機翼顫振特性，其中攷慮瞭機翼大變形和髮動機推力的作用。採用樑單元對雙樑式機翼和髮動機弔艙進行瞭結構建模，採用脩正的片條理論計算麯麵定常氣動力，脩正的Theodorsen方法計算麯麵非定常氣動力，髮動機推力始終沿髮動機軸線。研究機翼在不同攻角時的定常氣動力及髮動機推力聯閤作用下固有振動和顫振特性的變化情況。結果錶明，髮動機推力對機翼靜變形和固有頻率改變不大，但對顫振臨界速度的變化量不容忽視，有可能成為大型運輸機機翼設計的限製因素。
분석료대익조발동궤적대전현비궤익전진특성，기중고필료궤익대변형화발동궤추력적작용。채용량단원대쌍량식궤익화발동궤조창진행료결구건모，채용수정적편조이론계산곡면정상기동력，수정적Theodorsen방법계산곡면비정상기동력，발동궤추력시종연발동궤축선。연구궤익재불동공각시적정상기동력급발동궤추력연합작용하고유진동화전진특성적변화정황。결과표명，발동궤추력대궤익정변형화고유빈솔개변불대，단대전진림계속도적변화량불용홀시，유가능성위대형운수궤궤익설계적한제인소。
The lfutter of a large-aspect-ratio wing with engine is analyzed, in which the large deformation and the thrust effects of the engine under wing are considered. A twin-beam wing and the engine compartment are modeled as beams. The steady aerodynamics of the curved surface is calculated by the modiifed strip theory;the unsteady aerodynamics is calculated by the modiifed Theodorsen method;the thrust of the engine is alone the engine axis. The vibration and the lfutter characteristics of the wing with the steady aerodynamics of different angles of attack and with the different thrusts of the engine are analyzed. The results show that the change of the static deformation and the vibration frequencies affected by the thrust are small, but the change of the lfutter speed can not be neglected which would be an important factor limiting the large transporter design.
