A Modeling Method for Vibration Analysis of a Stator Frame of Turbine Generators and Its Application to a Design System: Vibration Analysis and Analysis System

A practical modeling method for predicting vibration characteristics of turbine generator stator frames was developed. The structural parts that compose a stator frame were categorized into three groups: parts that affect ring-mode vibration as mass, parts that affect it as stiffness, and parts that affect it as both. A proper boundary condition, the value of a modal damping ratio, and an accurate representation of exciting forces were examined. The modeling method was then applied to another turbine generator. It was found that the predicted natural frequency agrees with measured one within only a 3% error. Based on the modeling method, a vibration analysis system for design was developed.