QUESTION 27 020 The rotor of a steam turbine with mass 10.5 kg is mounted on steel shaft (E- 207 GPa). The shaft diameter is 49 mm and is 1.8 m long. The shaft is suppored at the two ends by the bearings The turbine rotor has an eccentricity of 9.0 mm and operates at T200 rpm (754.0 rad/s). Determine the natural frequency of the system in rad/s Rotor Ο 214.279 rads 50985.64 rad o 45915.49 ad/s 484424 rad/s QUESTION 28 Q21 (A): Asteel shatter 207 asa ofaan eter, dandlength Lissupported at the two ends in beangs as shown below. İtcames a turbine disc, of mass m and eccentricity a, at the midde and operates at n RPM. The damping in the system is equivalent to viscous damping with a damping ratio of Determine the whirl amplitude of the disc, A in m at the shaft speed, , Take m-7 kg , d-0.019m, L-1.35 m, α-0.0045 m, n-4900 RPM and ζ"0,04 to save all QUESTION 29 Q21 (B A steel shaft E-207 GPa) ot diameter, d and length, L is supported at the two ends in bearings as shown below It carries a turbine disc, of mass m and eccentricity a, at the midde and operates at n RPM. The damping in the system is equivalent to viscous damping with a damping ratio of Determine the critical speed, wcot the shaft in rad's QUESTION 30 021 (C A stoel shat -207 GPa) of diameter, a and lengn, L is bupported at the two ends in bearings as shown below. It caries a turbine disc, of mass m and eccentricity a, at IO viscous damping with a damping ratio of ζ the midde and operates at n RPM、The damping in the system is QUESTION 27 020 The rotor of a steam turbine with mass 10.5 kg is mounted on steel shaft (E- 207 GPa). The shaft diameter is 49 mm and is 1.8 m long. The shaft is suppored at the two ends by the bearings The turbine rotor has an eccentricity of 9.0 mm and operates at T200 rpm (754.0 rad/s). Determine the natural frequency of the system in rad/s Rotor Ο 214.279 rads 50985.64 rad o 45915.49 ad/s 484424 rad/s QUESTION 28 Q21 (A): Asteel shatter 207 asa ofaan eter, dandlength Lissupported at the two ends in beangs as shown below. İtcames a turbine disc, of mass m and eccentricity a, at the midde and operates at n RPM. The damping in the system is equivalent to viscous damping with a damping ratio of Determine the whirl amplitude of the disc, A in m at the shaft speed, , Take m-7 kg , d-0.019m, L-1.35 m, α-0.0045 m, n-4900 RPM and ζ"0,04 to save all QUESTION 29 Q21 (B A steel shaft E-207 GPa) ot diameter, d and length, L is supported at the two ends in bearings as shown below It carries a turbine disc, of mass m and eccentricity a, at the midde and operates at n RPM. The damping in the system is equivalent to viscous damping with a damping ratio of Determine the critical speed, wcot the shaft in rad's QUESTION 30 021 (C A stoel shat -207 GPa) of diameter, a and lengn, L is bupported at the two ends in bearings as shown below. It caries a turbine disc, of mass m and eccentricity a, at IO viscous damping with a damping ratio of ζ the midde and operates at n RPM、The damping in the system is