【作者】 尚丽娜；

【导师】 夏品奇；

【作者基本信息】 南京航空航天大学 ， 飞行器设计， 2009， 硕士

【摘要】 加筋薄壁结构是指用一系列沿纵向、横向及任意角度布置的加强筋对薄壁进行加强的结构。这种结构不仅具有良好的抗破坏、分层及裂纹扩展的能力,更重要的是具有较高的刚度质量比。在航空航天领域,加筋薄壁结构虽然已经广泛地应用于机身结构、机翼及航天飞行器等方面,但是在旋翼桨叶结构中尚未使用。重型直升机旋翼桨叶尺寸大、桨叶受载严重、刚度质量比要求高,常用的桨叶结构形式已不适用。因此,研究新型的具有较高刚度质量比的桨叶结构形式对发展重型直升机具有重要的意义。根据加筋薄壁结构的优点,本文采用有限元素法研究了将加筋薄壁结构应用于重型直升机旋翼桨叶结构的设计方法。首先,通过采用通用有限元软件Patran,建立了铺层加强、轴向加筋及螺旋加筋的重型直升机旋翼桨叶D型梁的有限元模型;然后,利用Nastran分析解算器,计算了其在轴向、弯曲及扭转载荷作用下的结构响应以获得相应的刚度质量比;最后,对采用不同方式设计的重型直升机旋翼桨叶D型梁的刚度质量比进行了比较分析。研究结果表明,采用加筋的桨叶结构形式,可以提高重型直升机旋翼桨叶的剖面刚度,并获得较高的刚度质量比。更多还原

【Abstract】 Stiffened thin-walled Structures are characterized by shells which are integrally stiffened by a series of ribs or stiffeners arranged in combinations of lateral, longitudinal and angular patterns. Such configurations possess excellent resistence to damage, delamination and crack propagation while exhibiting high stiffness to weight ratio. In aerospace, though the stiffened thin-walled Structures are commonly used in fuselage structures, wing structures and space vehicle structures, they are not used in conventional rotorblade structures.The large size, heavy load and high stiffness to weight requirement make it impractical to employ the conventional monocoque spar designs to the heavy-lift helicopter rotorblades. Thus it is very important for the development of heavy-lift helicopters to study new rotorblade structures with high stiffness to weight ratios. Considering the potential advantages of stiffened thin-walled Structures, by means of the finite element method,the design method of using stiffened thin-walled Structures for heavy-lift helicopter rotorblades is investigated in the present study. At first, the general purpose finite element code Patran is employed to creat the models of D spars of heavy-lift helicopter rotorblades with stiffened lays, axial stiffeners and helical stiffeners; Then, the analytical solution code Nastran is used to calculate the structural behaviors of these D spars under axial, bending and torsional loads to get their stiffness to weight ratios; Finally, the stiffness to weight ratios of these D spars are compared and analyzed. It is demonstrated that the stiffened thin-walled Structures can be used for heavy-lift helicopter rotorblades and increase the stiffness to weight ratios of rotorblades effectively.更多还原