GB/T 9239.21-2019

This standard specifies the terminology, technical specifications, and evaluation methods for balancing machines used to measure and correct rotor imbalance. It is applied in manufacturing and maintenance contexts, such as automotive, aerospace, and industrial machinery sectors, where rotating components like turbine rotors, crankshafts, or electric motor armatures require precise balancing to reduce vibration and ensure operational safety. The standard provides a basis for both machine manufacturers to declare performance and for end-users to verify compliance during acceptance testing.