TVC
Torsional Vibration Analysis
Lateral Vibration Analysis
Axial Vibration Analysis
Machinery Vibration Analysis

Some class societies and owners require this measurement by means of verification of regarding vessels TVC calculation.
The rules in this section apply to all shafting used in rotating machinery for propulsion, power production, steering and maneuvering independent of type of driver except auxiliary plants with less than 200 kW rated power.