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在扭曲叶片组振动频率及其振型的计算中,传递矩阵法得到了有效的应用。它将叶片作为变截面梁的非对称弯曲,将扭转振动与两个平面内的弯曲振动通过拉筋耦合在一起。本文对这种计算方法作了以下三点改进:1.考虑了叶片和拉筋的剪切变形和转动惯量的影响。2.合理地考虑了离心力的影响。3.在动态下计算叶片与拉筋之间的作用力和力矩。这样既提高了它的计算精度,又扩大了计算机程序的通用性。计算值与实测值符合良好。
In the calculation of the twisted blade group’s vibration frequency and its vibration mode, the transfer matrix method is effectively applied. It uses the blade as an asymmetric bending of a variable cross-section beam and couples the torsional vibration with the bending vibration in both planes through the tie bar. In this paper, the following three improvements have been made to this method: 1. The effects of shear deformation and moment of inertia on the blade and brace are considered. 2. Reasonable consideration of the impact of centrifugal force. 3. Dynamically calculate the force and moment between blade and brace. This not only improves its calculation accuracy, but also expands the versatility of computer programs. Calculated and measured values in good agreement.