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125 kW Single Shaft with ball bearings and flexmounts 8 12 16 20 24 28 32 4 36 40 4447 4 2 0 -2 -4 0 2 4 6 8 10 12 14 Axial Location, in Figure 5-27: Schematic illustrating the discretization used to estimate the rotor dynamics. 1000000 100000 10000 1000 1000. Undamped Critical Speed Map Preliminary 125 kWSingle Shaft with ball bearings and flexmounts 10000. 100000. 1000000. 10000000. Bearing Stiffness, lb/in Figure 5-28: Critical speed map showing revolutions per minute for the first, second and third fundamental modes of vibration as a function of bearing stiffness. The ball bearings are mounted on flex-mount material that is estimated to have a bearing stiffness of 34,000 lb/in. At 75,000 rpm the rotor shaft is between the 2nd and 3rd fundamental mode. Note that the idle speed should be above 40,000 rpm. Also during startup the rotor shaft should accelerate rapidly through the 1st and 2nd fundamental modes at 17,000 and 32,000 rpm respectively. 76 Critical Speed, cpm Shaft Radius, inPDF Image | Operation and Analysis of a Supercritical CO2 Brayton Cycle
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