GB/T 41850.9-2024 Mechanical vibration—Measurement and evaluation of machine vibration—Part 9:Gear units

Scope

This document specifies the specific requirements for measuring and classifying mechanical vibration of individual enclosed gearboxes or gearboxes with speed-increasing or speed-reducing gears. It provides methods for measuring shell vibration and shaft vibration, as well as the types of instruments, measurement methods, and test procedures used to determine vibration values. It also includes vibration classifications for acceptance testing.
This document does not include the measurement of torsional vibration.
This document applies to acceptance testing of gearboxes operating within their design speed, load, temperature, and lubrication ranges at the manufacturer's facility. Upon agreement between the manufacturer and the customer and/or operator, this document can also be used to guide on-site acceptance testing and routine operation measurements.
This document applies to gearboxes with rated power ranging from 10 kW to 100 MW and rated speeds from 30 r/min to 12,000 r/min (0.5 Hz to 200 Hz).
This document does not apply to special or auxiliary drive systems, such as integrated gear-driven compressors, pumps, turbines, or gear clutches used between combined-cycle turbine generators and power output gears.
The evaluation criteria provided in this document can be applied to the vibration of the main input and output shaft bearings of gearboxes and the internal shaft bearings. These criteria can be used to a limited extent to evaluate the condition of the gears. This document does not include professional techniques for evaluating the condition of the gears.
This document establishes provisions for on-site broadband vibration intensity evaluation under normal stable operating conditions for the following:
a) Structural vibration measured radially (i.e., laterally) at all main bearing seats or bases;
b) Structural vibration measured axially at thrust bearing seats;
c) Radial (i.e., lateral) vibra

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