摘要
针对轻质异形冠结构设计问题,提出了基于结构强度和振动分析的锯齿叶冠轮廓切除原则,采用拓扑优化确定了锯齿叶冠2维切除线,通过有限元计算得出叶冠优化后对叶盘结构典型部位应力水平、振动特性的影响。静强度计算结果表明:叶冠优化后在叶身与上、下缘板连接处Von-Mises应力分别降低16.1%、5.6%,在叶冠"Z"形凹口处Von-Mises应力降低24.5%,去除的叶冠质量占叶片质量的2.4%;模态分析和谐响应分析结果表明:叶冠优化后对叶盘结构振动特性不产生负面影响,保证了叶冠的阻尼减振作用。
In view of the structural design problem of the light-weight special-shaped shroud,the contour cutting principle of the zigzag shroud was put forward based on the structural strength and the vibration analysis. The two-dimension resecting line of the zigzag shroud was determined by the topology optimization. Through the finite element calculation,the influence of the optimized shroud on the stress level and vibration characteristics of the typical parts of the blade disk structure was obtained. The results of static strength calculation show that the Von-Mises stress decreases by 16.1% and 5.6% respectively at the junction between the blade and the upper and lower listrium after the optimization of the shroud. The Von-Mises stress decreases by 24.5% at the "Z" notch of the shroud,and the weight of the removed shroud accounts for 2.4% of the blade mass. The results of modal analysis and harmonic response analysis show that there is no negative influence on the vibration characteristics of the blade disk structure after the optimization of the shroud,and the damping effect of the shroud is guaranteed.
引文
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