A method for calculating dynamic frequency of self-locking blade of industrial steam turbine
A calculation method and technology for industrial steam turbines, applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of locking, can not reflect the damping characteristics of contact stiffness, and achieve safe and reliable operation, good economic benefits, and use. handy effect
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[0019] Such as Figure 1-3 As shown, there is a certain gap between the blade shroud and the boss, and the blade will produce a torsion angle under the action of centrifugal force. , the contact conditions are also different.
[0020] The method for calculating the dynamic frequency of the full-circle self-locking blades of the steam turbine described in this embodiment includes the following steps:
[0021] (1) Calculate the static strength of the blades in contact, and obtain the torsion angle at the top of the blade and the contact pressure between adjacent blade shrouds. The contact pressure is as follows: Figure 5 shown.
[0022] (2) In the area where the contact pressure is greater than 30MPa, that is Figure 5 In the darkest area, the spring unit MATRIX27 is established between the nodes on it, with a total of 48 units, such as Figure 4 shown.
[0023] (3) Let the normal stiffness k of the above spring unit n Same, tangential stiffness k t also the same, let v...
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