摘要
导管桨可以有效提高推进效率,相比于金属导管,复合材料导管可以有效地减少导管螺旋桨重量,有利于导管桨的工程应用。采用纵、环肋的导管结构设计,克服了复合材料导管刚度较低的缺点。分别以干、湿模态为目标函数,利用ANSYS有限元软件APDL优化设计理论,对导管环肋分布位置进行了优化设计,给出了导管的最优结构形式,并比较了一阶干、湿模态频率和振型的异同。研究结果表明,复合材料导管一阶湿模态频率约为一阶干模态频率的25%,但振型特征相差不大;给出的结构优化设计方法对复合材料导管结构的工程设计具有一定的指导意义。
Duct propeller can increase the propulsive efficiency. Comparing to the metal ducts, the composite duct can effectively reduce the weight of duct propeller, which is critical for the use of duct propeller. Through the designing of ring longitudinal and ring ribs, the disadvantage of composite duct＇s stiffness could be overcome. Based on the ANSYS APDL optimization design theory, two best duct structures have been given with the objective functions of dry and wet modal respectively. Accordingly, the best structure has been present. Meanwhile, the similarities and differences of dry and wet modal features, including the nature frequency and mode shape. The results show that the first nature frequency of wet modal is about one quarter of the dry＇s value, while the mode shapes are almost the same. The designing of composite duct and the optimization method have certain directive meaning to the engineering design.
出处
《玻璃钢／复合材料》
CAS
CSCD
北大核心
2015年第1期38-41,共4页
Fiber Reinforced Plastics/Composites
基金
国家自然科学青年基金项目(51104069)
