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本文对变截面的轮或轴分段用锥面的轮或轴来近似,单元内的位移用轴段端部位移作三次函数插值。考虑了轮和轴的回转仪力矩,对叶片(直叶片和扭曲叶片)也作了适当的处理。没有考虑轴的剪切及轴承油膜刚度的影响,轴承只作为刚性支座来考虑。本方法适合于计算结构复杂、多跨的转轴的临界转速。所编程序只需输入转轴的材料性质的有关常数、单元的尺寸及单元、结点编号等信息,使用方便。可计算前数阶临界转速和振型。
In this paper, the conical surface of the wheel or shaft section of the variable section is approximated by a wheel or shaft. The displacement inside the unit is interpolated by the cubic function of the end displacement of the shaft section. Taking into account the wheel and shaft gyroscopic moment, the blades (straight blades and twisted blades) are also made appropriate treatment. Did not consider the impact of shaft shear and bearing oil film stiffness, bearing only as a rigid bearing to consider. The method is suitable for calculating the critical speed of a rotating shaft with complex structure and multi-span. The program just enter the material properties of the shaft constant, the size of the unit and unit, node number and other information, easy to use. Calculate the first order critical speed and mode shapes.