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Hello, I am currently experiencing vibration issues with a 27-ton generator rotor running at 3600 rpm. The vibrations at the 1500 rpm/1st critical speed are at 10 mm/s rms, while at the 2700 rpm/2nd critical speed they are at 19mm/s rms. The vibration levels at the NDE V side are at 10 mm/s, and at the DE V side they are at 4 mm/s during the 1st critical speed. The vibrations are higher on the NDE side compared to the DE side. The spectrum analysis shows that the vibrations are predominantly at the 1x peak, indicating an unbalanced rotor. Can anyone provide advice on how to balance this rotor in order to achieve optimal performance at full speed? Thank you.
Greetings! Have you conducted start-up and coast-down tests for your generator? An increase in the 1x order in the spectrum may be due to unbalance, structural looseness, or resonance. Make sure to address these issues to ensure optimal performance. Best regards.
Answer: - Common symptoms of an unbalanced rotor in a generator include increased vibrations, particularly at specific critical speeds, as well as uneven vibration levels between the non-drive end (NDE) and drive end (DE) sides.
Answer: - The critical speeds of a generator rotor can be determined through vibration analysis, where significant increases in vibration levels occur at specific rotational speeds.
Answer: - Balancing a generator rotor is crucial for reducing vibrations, minimizing wear and tear on components, and ensuring smooth operation at full speed, ultimately enhancing the overall performance and longevity of the equipment.