重型燃气轮机端面弧齿动力学特性及动应力研究

Combining dynamic analysis with static analysis, the dynamic stress of curvic couplings was studied in the process of working condition. First, a dynamic analysis of rotor was carried out by adopting equivalent bending stiffness model and traditional stiffness model for the contact area and the continuous region respectively. The dynamic analysis results were then taken as the displacement boundary conditions of static analysis to study the dynamic stress of curvic couplings. Results show that the bearing capacity of curvic couplings is correlated with the pressure angle, the greater the pressure angle is, the higher the bearing capacity would be. However, the pressure angle can't be too large, otherwise, the transmission efficiency would be reduced. Under the action of centrifugal force, the dynamic stress of curvic couplings changes periodically in hoop direction at different positions. The stress on teeth surface is small at bolt position, which is large at middle position, whereas the variation tendency of stress on teeth root is contrary to that on teeth surface. Under the action of torque, an obvious stress difference exists between the bearing side and non-bearing side. The rotor is no longer a cyclic symmetric structure under the action of bending force, as the running orbit of the rotor is an ellipse, and the stress distribution of the curvic teeth alters two times in a round.