Gas Turbine Blade Damper Optimization Methodology

Table 1

Estimated eigenvalues for various conditions normalized with 1st natural frequency at room temperature.

Mode number and frequency (Hz)				Simulated condition/constraints
1	2	3	4
f1	1.74f1	2.26f1	3.06f1	Nonrotating blade at room temperature
1.008f1	1.755f1	2.27f1	3.08f1	Rotating at 50% RPM at room temperature
1.056f1	1.79f1	2.30f1	3.16f1	Rotating at 100% RPM at room temperature
0.95f1	1.61f1	2.06f1	2.85f1	Rotating at 100% RPM at 800°C average blade temperature