计算中考虑了两种边界条件：一种是固定支承的；一种是弹性支承的。
By this Method, the natural frequency of revolution with geomeric axisymmetric imperfections was computed for two kinds of boundary conditions: one is fixed, the other is elastically supported.
所要做的只是将单元用四个螺栓固定到其支承表面上。
All that is needed is to bolt the unit to its support using four bolts.
但是，在某些场合下，也有外圈运转，内圈固定起支承作用或者内圈、外圈都同时运转的。
However, in some situations, there are outer operation, the inner fixed play supporting role or inner and outer rings are also functioning.
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