BS ISO 21940-12:2016

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Fundamentals of dynamics and balancing of
  rotors with flexible behaviour
5 Rotor configurations
6 Procedures for balancing rotors with flexible
  behaviour at low speed
7 Procedures for balancing rotors with flexible
  behaviour at high speed
8 Evaluation criteria
9 Evaluation procedures
Annex A (informative) - Cautionary notes concerning
        rotors when installed in-situ
Annex B (informative) - Optimum planes balancing - Low-speed
        three-plane balancing
Annex C (informative) - Conversion factors
Annex D (informative) - Example calculation of equivalent
        residual modal unbalances
Annex E (informative) - Procedures to determine whether
        a rotor shows rigid or flexible behaviour
Annex F (informative) - Method of computation of unbalance
        correction
Bibliography

Defines typical configurations of rotors with flexible behaviour in accordance with their characteristics and balancing requirements, describes balancing procedures, specifies methods of assessment of the final state of balance, and establishes guidelines for balance quality criteria.