CAJ | 학술논문

针对一类具有客舱地板下部斜撑杆的民机典型机身段,研究了斜撑杆对机身段耐撞性能的影响.建立了客舱地板及其下部结构的有限元模型,客舱地板以上的框段结构、乘员质量和座椅被简化为刚性质量块.分析了斜撑杆为开孔/不开孔开剖面结构、斜撑杆剖面尺寸变化以及无斜撑杆和刚性斜撑杆情况下,机身段在坠撞速度为7 m/s时的冲击特性.对比分析了各种情况下座椅位置处的加速度-时间历程曲线、机身段的破坏模式和能量吸收情况.结果表明存在合适刚度的斜撑杆,使该类型机身结构具有良好的耐撞毁性能,而增加或减少斜撑杆刚度均有可能产生多次高过载.
침대일류구유객창지판하부사탱간적민궤전형궤신단,연구료사탱간대궤신단내당성능적영향.건립료객창지판급기하부결구적유한원모형,객창지판이상적광단결구、승원질량화좌의피간화위강성질량괴.분석료사탱간위개공/불개공개부면결구、사탱간부면척촌변화이급무사탱간화강성사탱간정황하,궤신단재추당속도위7 m/s시적충격특성.대비분석료각충정황하좌의위치처적가속도-시간역정곡선、궤신단적파배모식화능량흡수정황.결과표명존재합괄강도적사탱간,사해류형궤신결구구유량호적내당훼성능,이증가혹감소사탱간강도균유가능산생다차고과재.
This article investigates the effect of oblique struts on the crashworthiness of fuselage sections for a class of typical civil aircraft fuselage sections with oblique struts under the cabin floor.A finite element model of the cabin floor and its underneath structure is developed.Rigid blocks are used to simulate the structure above the cabin floor and the mass of the passenger and the seat.The impact characteristics of fuselage sections subjected tO 7 m/s vertical velocity are analyzed.Several typical conditions of oblique struts are considered,i.e.strut of different cross-sections with and without holes,rigid struts and no struts.A contrastive analysis is given of acceleration histories,failure mode and energy absorption of different fuselage sections.The result shows that there is a certain stiffness of the strut for the fuselage section that will exhibit good performance on crashworthiness.But more than two high accelerations may appear if the stiffness of the strut is increased or decreased.