A Vibration Analysis case study. Case relates to a Steam Turbine Driven 1.5 Kw Generator. Might be helpful for people who are interested in learning ...
VIbration Analysis on BLDC motors on QuadcoptersDescripción completa
Vibration of a gearbox with results and equations
vibration analysis level-I syllabus by skf conduct exams.Full description
Foundation assessment under vibration effectDescrição completa
Full description
Descripción completa
vib
Vibration Analysis GuideFull description
Descripción completa
Full description
REPORT ON TG-4 ALTERNATOR’S ROTOR BALANCING ACTIVITY
There was a vibration concern on the vibration magnitude at the non drive end bearing of the TG-4’s alternator. It was out of the safe limits for equipment like this. So it was decided to take appropriate measures to rectify the cause of these high vibrations. It was found out that there was a mass unbalance on the alternator’s rotor and we had to carry out a balancing activity on the rotor. Below is a schematic of bearing locations and vibration pick points on the equipment;
The table below shows the data before the balancing activity at different loads; Load Dates
Thrust Bearing Horizontal Thrust Bearing Axial Steam End Bearing Horizontal Exhaust End Bearing Horizontal Exhaust End Bearing Vertical Exhaust End Bearing Axial Gear Box Bearing Horizontal Gear Box Bearing Vertical Gear Box Bearing Axial Generator Generator Bearing Horizontal
1230 KW 21/04/200 9 mm/sec
1340 KW 07/04/200 9 mm/sec
600 KW 10/02/200 9 mm/sec
720 KW 09/02/200 9 mm/sec
08/02/2009
2.2
2.3
1.9
2.4
1.1
1.7
1.8
1.3
1.9
1
2
2
1.9
2
1
2.2
2.3
2
2.3
1.3
2.4
2.4
2.1
2
1.6
1.8
1.7
1.6
1.7
1
2.2
2.3
2.2
2.3
1
1.2
1.2
1.2
1
0.55
1.3
1.3
1.3
1.2
0.6
7.1
7.2
6.4
7
3.2
Vibration Magnitudes before Balancing
0 KW
mm/sec
BALANCING ACTIVITY
The turbine was given a run and it was confirmed that mass unbalance was the only cause of increased vibration. So as per procedure of dynamic balancing, a trial weight of 205 grams was attached to the fan of alternator, as it was the only part that was accessible and safe to attach weight to. After attaching the weight the turbine was given a run and a 30 % difference in the vibration compared to the previous readings was achieved, as the thumb rule of dynamic balancing suggests. After this run it was found out that a correction weight of 445 grams was to be attached to the fan at an angle of 228 degrees. The weight was prepared and attached to the fan and then a final run was given to the turbine which showed that a significant drop in the vibration magnitude has occurred. The results are tabulated below. Load Dates
Thrust Bearing Horizontal Thrust Bearing Axial Steam End Bearing Horizontal Exhaust End Bearing Horizontal Exhaust End Bearing Vertical Exhaust End Bearing Axial Gear Box Bearing Horizontal Gear Box Bearing Vertical Gear Box Bearing Axial Generator Bearing Horizontal