Numerical Estimation of Torsional Dynamic Coefficients of a Hydraulic Turbine

<table>Reduction of the eigenfrequency (the eigenfrequency of the mechanical system is 1) due to the flow through the turbine. The “undamped” markers represent the effect of an added polar inertia alone.</table>

International Journal of Rotating Machinery

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Figure 7

Figure 7: Numerical Estimation of Torsional Dynamic Coefficients of a Hydraulic Turbine 