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振动疲劳是涡轮机叶片损坏的主要原因之一。为了合理地设计叶片,降低共振应力,除了采取可能的减振措施外,还必须精确地计算叶片的固有频率,保证叶片在工作时,不致落入共振区域。 在以往的振动计算中,对于扭曲度不大的叶片,往往只考虑双向弯曲变形。随着涡轮机功率不断增加,出现了大自然扭曲度的长叶片。在这种情况下若只考虑两向弯曲,不足以反映叶片振动的真实情况,计算偏差较大。1966年发表了J.MONTOYA的方法。他提出的叶片振动理
Vibratory fatigue is one of the major causes of turbine blade damage. In order to design the blade rationally and reduce the resonance stress, in addition to the possible vibration reduction measures, the natural frequency of the blade must be accurately calculated to ensure that the blade does not fall into the resonance region during operation. In the past vibration calculation, for the blade is not distorted, often only consider the two-way bending deformation. As the turbine power continues to increase, there are long blades of natural twist. In this case, if only two-way bending is considered, it is not enough to reflect the real situation of blade vibration, and the calculation deviation is large. 1966 published J.MONTOYA method. He proposed the vibration of the blade