一种转子叶片的有限元建模方法及验证

A finite element modeling method of rotor blades and its verification

采用有限元法建立了一个单转子模型。将不同长度的叶片简化为质量单元,研究其对模型临界转速计算结果的影响。结果表明,当叶片长度很短时,简化为质量单元建模对计算结果影响不大,当叶片长度很长时对计算结果影响非常大。分析了叶片简化对结果影响的原因,在此基础上提出了将大量薄叶片简化为少量厚叶片的建模方法,此方法在保证结果准确的前提下,有效地将有限元模型缩减了33%。

With the finite element method,a single rotor model is established in the paper. The paper studies the rotor model blades of different lengths are simplified to mass elements and the effects of this simplification on critical speed calculation results. The results showthat,when the length of the blade is very short,the effect of mass element simplification on the calculation results is very small and neglectable,but when the blade is in great length,there is fundamental impact on the calculation results and must be taken into account. Based on the analysis of the reasons why the mass element simplification of blade influences the results,the modeling method is proposed to replace the large quantity of thin blades with fewer thick blades.With this modeling method,the scale of the finite element model is reduced effectively 33% while the calculation precision remains the same.