复合材料参数化桨叶的动力学减振优化设计

为了进行桨叶动力学优化设计,建立面向工程设计的复合材料多闭室C型梁桨叶剖面参数化模型,实现了桨叶剖面气动外形、内部结构组件、复合材料铺层设计的参数化,并提出了一种保持C型梁纤维面积恒定的参数化设计方法.采用全局寻优能力较强的多种群遗传算法(MPGA),集成参数化设计模型与旋翼有限元气动弹性综合分析模型,通过桨叶各剖面结构组件的参数优化实现了旋翼动力学减振.算例给出了"海豚"直升机桨叶剖面特性实测值与参数化桨叶模型计算值的对比,整体误差不超过3%,并用该参数化模型对桨叶进行动力学减振优化,实现了旋翼加权优化振动载荷系数减小4.15%,经过优化后桨叶的配重位置更加分散,有利于缓解桨叶内部应力/应变突变;而且部分配重分配到桨尖,提高了旋翼的自转惯量,增加了旋翼自转下滑的安全性.

Vibration reduction optimization design for parameterized composite blade

For blade dynamics optimization design, a parametrization model of composite multi-cell C-type blade section was estabished for engineering design. The parameterized design of aerodynamic shape of the blade section, the internal structure of components and composite material layer was implemented, and a parameterized method capable of maintaining a constant C-type beam fiber area was presented. Then in combination with the composite blade parameterization model and aero-elastic analysis model, the optimal parameters of blade sections could be obtained to reduce the hub vibration via the optimal process based on multi-population genetic algorithm(MPGA). The "Dolphin" helicopter's blade profile modeling and performance calculation contrasts were given, with total error less than 3%. With use of the blade parameterization model of blade for rotor dynamic optimization, the results show that the rotor's weighted optimizaton vibration load coefficient decreases by 4.15%, and the balance weight of blade is more smooth after optimization, helping to ease the blade internal stress/strain mutation; some balance weight assigned to the blade tip can increase the rotation inertia of the rotor, and improve the safety for autorotative glide.