19/30383016 DC - BS ISO 20816-9. Mechanical vibration. Measurement and evaluation of machine vibration. Part 9. Gear units

19/30383016 DC

BS ISO 20816-9. Mechanical vibration. Measurement and evaluation of machine vibration. Part 9. Gear units

Status : Current, Draft for public comment   Published : June 2019



This document specifies methods for determining and classifying mechanical vibration of individually housed, enclosed, speed increasing or speed reducing gear units. It specifies methods for measuring housing and shaft vibrations, and the types of instrumentation, measurement methods and testing procedures for determining vibration magnitudes. Vibration grades for acceptance are included.

This document does not include torsional vibration measurements of a geared system.

It applies primarily to a gear unit operating within its design speed, load, temperature range and lubrication for acceptance testing at the manufacturer's facility. The gear unit may be tested in-situ if agreed upon and operated in accordance with the manufacturer's recommendations. Other International Standards and vibration evaluation may be required for measuring the driver or driven machine in field service.

This document applies to gear units of nominal power rating from 10 kW to 100 MW and nominal rotational speeds between 30 r/min and 12 000 r/min (0,5 Hz to 200 Hz).

This document does not apply to special or auxiliary drive trains, such as integrated gear-driven compressors, pumps, turbines, etc., or gear type clutches used on combined-cycle turbo generators and power take-off gears.

The evaluation criteria provided in this document can be applied to the vibration of the main input and output bearings of the gearbox and to the vibration of internal shaft bearings. They may have limited application to the evaluation of the condition of those gears. Specialist techniques are required for evaluating the condition of gears, which are outside the scope of this document.

This document establishes provisions for evaluating the severity of the following in-situ broad-band vibration:

  1. structural vibration at all main bearing housings or pedestals measured radial (i.e. transverse) to the shaft axis;

  2. structural vibration at thrust bearing housings measured in the axial direction;

  3. vibration of rotating shafts radial (i.e. transverse) to the shaft axis at, or close to, the main bearings;

  4. structural vibration for measuring meshing frequencies on the housing.

These are in terms of vibration under normal steady-state operating conditions.


Vibration during other (non-steady-state) conditions when transient changes are taking place, including run up or run down, initial loading and load changes are outside the scope of this document.

Standard Number19/30383016 DC
TitleBS ISO 20816-9. Mechanical vibration. Measurement and evaluation of machine vibration. Part 9. Gear units
StatusCurrent, Draft for public comment
Publication Date17 June 2019
Normative References(Required to achieve compliance to this standard)ISO 10817-1, ISO 2954, ISO 2041
Informative References(Provided for Information)ISO 13373 (all parts), ISO 20816-1, ISO 16063-44, ISO 5348, ISO 10816-21, ISO 16063-21
International RelationshipsISO/DIS 20816-9
Draft Expiry Date06 August 2019
DescriptorsVibration measurement, Mechanical measurement, Evaluation, Measurement, Vibration
Title in FrenchVibrations mécaniques — Mesurage et évaluation des vibrations de machines — Partie 9: Engrenages Partie 9: Engrenages
File Size1.085 MB
NotesWarning: this draft is not current beyond its expiry date for comments.

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