ROTOR BALANCING METHOD AND APPARATUS

• Main Author: Meng, Zhiqiang
• Format: Patent
• Language: English; French; German
• Published: 13.11.2019
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; PHYSICS; STEAM ENGINES; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; WEAPONS

There is provided a rotor balancing method for a gas turbine. The method comprises providing a rotor (100) comprising: a first bearing (140) and a second bearing (142), and a plurality of correction planes (150) comprising a first correction plane (152) and a second correction plane (154). The method further comprises mounting the rotor (100) for balancing by receiving the first bearing (140) on a first pedestal (212) and the second bearing (142) on a second pedestal (214). The method further comprises performing a base run by: running the rotor (100) at an intended balance speed and measuring the vibrations at the first pedestal (212). The method further comprises carrying out partial balancing and a first influence run of the rotor (100) by: fitting a first balancing weight (W1) to the first correction plane (152) in order to reduce vibrations at the first pedestal (212). The method further comprises performing a first influence run by: running the rotor (100) at the intended balance speed and measuring the vibrations at the first pedestal (212) and the second pedestal (214), leaving the first balancing weight (W1) fitted for all following influence runs. The method further comprises performing a second influence run by: fitting a first calibration weight (M1) to the second correction plane (154), running the rotor (100) at the intended balance speed and measuring the vibrations at the first pedestal (212) and the second pedestal (214), and removing the first calibration weight (M1). The method further comprises carrying out final balancing of the rotor (100) by: fitting a final balancing weight (W1') to the first correction plane (152) and a second balancing weight (W2) to the second correction plane (154) dependent on the vibrations measured as part of the first influence run and the second influence run.