The rotor stability analysis is used to estimate the high amplification factor of first critical speed for sensitive machine, and it is composed with simplified Level I and detailed Level II analysis. Stability study has two (2) purposes: first, it provides an initial screening to identify rotors that do not required a more detailed study. Second, this stability study specifies a standardized procedure applied to equipment manufacturers. This analysis is one of procedure of lateral study (rotordynamics), and damping and instability factor is calculated.
Stability analysis includes below kinds of procedure;
- Estimate the anticipated cross coupling coefficients
- For centrifugal and axial compressors
- Damping and log decrement
- Stability experience plot
- Gas density and critical speed ratio
- Level 1 analysis (Level I)
- Level 2 analysis (Level II)
- For labyrinth seals, damper seals, impeller/blade flow aerodynamic effects
- Acceptance criteria for stability study
- Assessment of instability factor
After lateral study completed, Level 1 analysis shall be performed the rotating equpment that meet the following;
- Rotors whose maximum continuous speed is greater than the first undamped critical speed on rigid support condition.
- Rotor with fixed gometry bearings
Damping & Instability
As results of Level 1 analysis, the damping and instability factor is lower than 0.1, Level 2 stability analysis shall be performed. Final log decrement shall be greater than 0.1.
These analysis shall be calculated at the defined maximum continuous speed of rotating equipment.
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INERTANCE’s related services include;
- Field balance
- Torsional vibration analysis
- Vibration Monitoring
- Pulsation study for reciprocating compressor
- Pulsation study for reciprocating pump
- Pulsation control
- Acoustic induced vibration (AIV)
- Flow induced vibration (FIV)
- HVAC Vibration