About Analysis of the cause of abnormal noise from generator blades
The abnormal broadband noise and vibration have occurred in the generator in the driveline of the internal combustion engine power plant. This paper focuses on the vibration transmission path and the influencing factors based on testing and modeling analysis of a 16V280 diesel generator set.
The abnormal broadband noise and vibration have occurred in the generator in the driveline of the internal combustion engine power plant. This paper focuses on the vibration transmission path and the influencing factors based on testing and modeling analysis of a 16V280 diesel generator set.
Pressure fluctuations in flow passage are harmful to machine stability since they cause output power oscillations, vibrations, resonance of HPS foundations, tears inside draft tube and blade cracks. Pressure fluctuations can be revealed by low-frequency swirls inside draft tubes, flow separations in penstocks, Von Karman vortex and inter blade .
Main components investigated for the root cause of high vibration issue include generator rotor and casing. Rotor behavior has been examined by capturing orbit and shaft centerline diagrams, whereas casing contribution has been investigated by conducting operating deflection shape analysis.
By applying the principles outlined in this paper, power system designers and end users alike will be able to more easily control unwanted noise from their on-site power system. Like many types of rotating machinery, reciprocating engine-powered generator sets produce noise and vibration.
Corresponding to high level rotor blades vibration in the compressor, noise signals at four testing positions are analyzed through cross-spectrum analysis. And the propagation regularity of the characteristic frequency 1402 Hz is expounded by its phase relationship at different testing positions.
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6 FAQs about [Analysis of the cause of abnormal noise from generator blades]
What causes high vibration in a turbine generator?
Data from proximity probes installed on turbine generator system are captured and analyzed against any factor contributing toward high vibration issue. Fish bone diagram was used for root cause investigation. Main components investigated for the root cause of high vibration issue include generator rotor and casing.
What causes vibration in a generator?
Table 1. Reasons for vibration and their remedies . Rotor Imbalance, Shaft Misalignment, Swing of hydraulic forces, Generator Eccentric magnetic pull, Forces in labyrinth seal, Instability in bearings oil, Seal rubs.
Do reciprocating engine-powered generators make noise?
Like many types of rotating machinery, reciprocating engine-powered generator sets produce noise and vibration. Whether these generator sets run continuously in prime power applications or only occasionally in standby applications, their operating sound levels often must be reduced to comply with local, state or federal ordinances.
Do rotor turns affect generator vibration in a gas turbine power plant?
The abnormal increase of generator vibration in a gas turbine power plant is tracked and analyzed, and the possibility of misjudgement in judging the short-circuit between rotor turns in the ROS experiment is illustrated through the field situation.
What happens if a generator is imbalanced?
When the air gap of generators varies 10–15% of its minimum length, a significant imbalance occurs after 15–20 years, which may reach up to twice the value of that of a new one. If the stator frame and core assembly are imbalanced under this condition significant vibrations would take place.
How loud should a generator be?
Whether these generator sets run continuously in prime power applications or only occasionally in standby applications, their operating sound levels often must be reduced to comply with local, state or federal ordinances. In North America, maximum permitted overall noise levels range from 45 dB(A) to 72 dB(A), depending on location and zoning.
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