西南交通大学学报
西南交通大學學報
서남교통대학학보
JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY
2014年
4期
675-681
,共7页
主起落架构型%有限元模型%动荷载系数%弯沉曲线%拉应力%土基响应深度
主起落架構型%有限元模型%動荷載繫數%彎沉麯線%拉應力%土基響應深度
주기락가구형%유한원모형%동하재계수%만침곡선%랍응력%토기향응심도
configuration of main landing gear%finite element model%dynamic load coefficient%deflection curve%tensile stress%response depth on soil base
为给飞机和跑道的优化设计提供参考和理论依据，基于弹性层状体系理论，建立了水泥混凝土跑道的三维有限元模型；选取了2组荷载水平相当、主起落架构型差异明显的飞机，对比分析了飞机主起落架构型变化对跑道全宽度位移、应变、板底拉应力以及土基响应深度的影响。模拟结果表明：当荷载相同时，主起落架上机轮总数越多，水泥混凝土道面板位移峰值、板底最大拉应力越小，起落架构型差异导致的道面板位移峰值相差13％左右，板底拉应力相差达35％；起落架间距越小，荷载作用区位移曲线越平缓，荷载作用区拉应变越小，土基响应深度越大，起落架构型变化导致的荷载作用区拉应变相差12％，土基响应深度相差14％；主起落架构型变化对距离荷载作用位置较远区域的竖向位移基本无影响。
為給飛機和跑道的優化設計提供參攷和理論依據，基于彈性層狀體繫理論，建立瞭水泥混凝土跑道的三維有限元模型；選取瞭2組荷載水平相噹、主起落架構型差異明顯的飛機，對比分析瞭飛機主起落架構型變化對跑道全寬度位移、應變、闆底拉應力以及土基響應深度的影響。模擬結果錶明：噹荷載相同時，主起落架上機輪總數越多，水泥混凝土道麵闆位移峰值、闆底最大拉應力越小，起落架構型差異導緻的道麵闆位移峰值相差13％左右，闆底拉應力相差達35％；起落架間距越小，荷載作用區位移麯線越平緩，荷載作用區拉應變越小，土基響應深度越大，起落架構型變化導緻的荷載作用區拉應變相差12％，土基響應深度相差14％；主起落架構型變化對距離荷載作用位置較遠區域的豎嚮位移基本無影響。
위급비궤화포도적우화설계제공삼고화이론의거，기우탄성층상체계이론，건립료수니혼응토포도적삼유유한원모형；선취료2조하재수평상당、주기락가구형차이명현적비궤，대비분석료비궤주기락가구형변화대포도전관도위이、응변、판저랍응력이급토기향응심도적영향。모의결과표명：당하재상동시，주기락가상궤륜총수월다，수니혼응토도면판위이봉치、판저최대랍응력월소，기락가구형차이도치적도면판위이봉치상차13％좌우，판저랍응력상차체35％；기락가간거월소，하재작용구위이곡선월평완，하재작용구랍응변월소，토기향응심도월대，기락가구형변화도치적하재작용구랍응변상차12％，토기향응심도상차14％；주기락가구형변화대거리하재작용위치교원구역적수향위이기본무영향。
In order to provide a theoretical basis for the optimal design of aircraft and pavement,a finite element model of runway was established based on the elastic layered theory to analyze the mechanical responses caused by changing main landing gears. Two sets of aircrafts with the same loads level but different in main landing gear configurations were chosen. The simulation results show that the change of main landing gear configurations influences dramatically on mechanical responses in loading areas. In the condition that aircraft loads are equal,increasing of the total number of wheels on main landing gears will decrease vertical displacement peaks and tensile stresses on panel bottom,the difference of vertical displacement peaks is up to 13% and the difference of tensile stresses on panel bottom is up to 35%. When the spacing between main landing gears is small,displacement curves for the loading areas are gentle and strains in the loading areas are small,but response depth on soil base is large. The difference of strains is up to 12% and the difference of response depth on soil base is up to 14%. The change of the configurations has little effect on vertical displacements far away from loading areas.
