| Autor: |
Meng Hee Lim, Asrar, Zair, Kee Quen Lee, Leong, Mohd Salman |
| Předmět: |
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| Zdroj: |
International Journal of COMADEM; Apr2024, Vol. 27 Issue 2, p45-50, 6p |
| Abstrakt: |
This paper presents a case study for fault diagnosis and mitigation of excessive motor vibrations caused by floor-induced resonance. Vertical motors in a water treatment plant had experienced excessive vibration levels (> 12 mm/s) at its non-drive end (NDE) location. A comprehensive vibration investigation was conducted to map-out the vibrations of the entire machine train which includes pipes, coupling, motors, pedestal, plinth and floor slab of the pump house. Vibration investigation found that the root cause of the excessive motor vibration was caused by the resonance of the floor slab as the natural frequency of the floor slab (20 Hz) coincided with the operating frequency (25 Hz) of the motors. As such, the first remedy action undertaken at that time was the reinforcement of the motor pedestal with additional ribs in order to shift the primary natural frequency of the motor-pedestal system to be away from the motor operating frequency. However, this attempt failed to subside the excessive motor vibration as this method did not result in significant shift in the natural frequency of the motor-pedestal-floor system. The second attempt was conceived to design a tuned-mass damper (TMD) for the motors. Finite Element Analysis was used to design a custom made TMD to be attached at the motor NDE locations. After several fine-tuning and modifications, the TMD was installed and had successfully reduced the motor NDE vibration levels for the vertical motors to be within 5 mm/s for all tri-axes measurements and thus enables the motors for long term unrestricted operation in accordance with the ISO 10816-3 Standard. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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