| 摘要 |
PURPOSE:To reduce vibration and to aim at reducing the weight of a turbine by adjusting the thickness of a blade for the balancing with respect to the axial center of the pump and the axis orthogonal to the pump axis. CONSTITUTION:The thickness of a blade 2 is adjusted so that the static balance with respect to the center line 3 satisfies the relation, SIGMAMA'=SIGMAMB', where MA', MB' are moments of the mass of infinitesimal portions A', B' about the center line 3. For the static balance with respect to the axial center 0' vertical to the center line 3, the thickness of the blade 2 is adjusted so that the integral of a moment of an infinitesimal part C' of the blade 2 within an infinitesimal angle DELTAtheta having a momentum arm in the direction of the center line 3 with respect to the axial center 0', to the integral of an infinitesimal part D' having a momentum arm in the direction of the center line 3 with respect to the axial center 0', over an angle theta. |
