Turbomachinery Rotordynamics With Case Studies Pdf -

Machine: 8 MW induction motor driving a pinion compressor, speed range 8,000–15,000 rpm.

Symptom: Sharp vibration peaks at 9,200 rpm and 13,800 rpm during coast-down.

Diagnosis:

Root Cause: The coupling spacer had a fitted key that was 0.05 mm oversized, creating an asymmetric mass distribution.

Solution: Precision grinding of key and dynamic balancing of the complete rotating assembly including coupling. turbomachinery rotordynamics with case studies pdf

Lesson: Balance the entire rotating train, not individual components.

Subject: Mechanical Engineering / Vibration Analysis Key Topics: Rotor Stability, Lateral Analysis, Torsional Analysis, Seal Dynamics, Impeller Whirl Target Audience: Rotating Equipment Engineers, Researchers, Graduate Students Machine : 8 MW induction motor driving a

Software like XLTRC2, DyRoBeS, or ARMD is used to create finite element models. Case studies show how to adjust bearing coefficients, seal stiffness, and disk locations to match measured critical speeds.