タービン発電機ステータコイルエンドの固有振動特性(機械力学,計測,自動制御)

概要

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To understand the vibration phenomenon of a coil end of a turbine generator, that is a stator coil winding part, natural vibration characteristics of a coil end were measured by experimental modal analysis. After that, a finite element model of the coil end was created. The boundary conditions in the model are the rigidity of the bracket that supports the coil end and the slot rigidity between the stator core and the coil. These rigidities were modeled with spring elements. Strain energy distribution and circular ring natural frequencies of the coil end were calculated by the FEM model. The comparison between the measurements and the calculations leads to the following conclusions. The coil end has four vibration modes.namely, two, four, six, and eight node ring modes, with three dimensional deformations. Strain energy distributions of the model show that the bracket rigidity largely affects the four, six, and eight node ring modes and that the slot rigidity largely affects the two node ring mode. The bracket rigidity was estimated by vibration test, and the slot rigidity of the spring elements was set so that the actual two node natural frequency could be adjusted. By using these rigidities and unisotropic Yong's modulus for the coil end model, the natural vibration characteristics of the coil end can be calculated.
社団法人日本機械学会の論文
2004-04-25