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针对1个扭型、变截面旋转叶片,基于ANSYS有限元软件,采用变厚度壳单元来模拟真实叶片的方法建模,并与实体单元模型对静频和固有振型进行对比,验证了该建模方法的准确性;在此基础上分析了科氏力、旋转软化、离心刚化以及三者耦合对叶片动频特性的影响规律;基于壳单元动频数据,对现在常用的动频系数经验公式的适用性进行了简单评价。研究结果表明:2种模型的动频规律一致,对系统影响由大到小依次为离心刚化、旋转软化和科氏力;叶片A0振型的动频系数吻合较好,A1振型的反之。
Aiming at a torsional and variable-section rotating blade, based on ANSYS finite element software, the variable thickness shell element is used to simulate the real blade. Compared with the solid element model, the static frequency and natural vibration mode are verified. Based on this, the influences of Coriolis force, rotation softening, centrifugal stiffening and the three coupling on the dynamic characteristics of the blade were analyzed. Based on the dynamic frequency data of the shell element, the experience of the commonly used dynamic frequency coefficient The applicability of the formula was briefly evaluated. The results show that the two models have the same law of moving frequency and the influences on the system are centrifugal stiffening, rotational softening and Coriolis force in descending order. The dynamic frequency coefficients of the A0 moderation agree well with the A1 mode .