BS ISO 20816-9 pdf free download
BS ISO 20816-9-2020 pdf free download.Mechanical vibration — Measurement and evaluation of machine vibration Part 9: Gear units.
This document specifies requirements 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. Torsional vibration measurements are outside the scope of this document.
It applies to a gear unit operating within its design speed, load, temperature and lubrication range for acceptance testing at the manufacturer’s facility. By agreement between manufacturer and customer and/or operator, it can be used for guidelines for on-site acceptance testing and for routine operational measurements.
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 can have limited application to the evaluation of the condition of those gears. Specialist techniques for evaluating the condition of gears are outside the scope of this document.
This document establishes provisions under normal steady-state operating conditions for evaluating the severity of the following in-situ broad-band vibration:
a) structural vibration at all main bearing housings or pedestals measured radially (i.e. transverse) to the shaft axis;
b) structural vibration at thrust bearing housings measured in the axial direction;
c) vibration of rotating shafts radially (i.e. transverse) to the shaft axis at, or close to, the main bearings;
d) structural vibration on the gear casing.
NOTE Vibration occurring during 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2041, Mechanical vibration, shock and condition monitoring — Vocabulary
ISO 2954, Mechanical vibration of rotating and reciprocating machinery — Requirements for instruments for measuring vibration severity
ISO 10817-1, Rotating shaft vibration measuring systems — Part 1: Relative and absolute sensing of radial vibration
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2041 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 gear unit
mechanical input/output device with a series of at least two meshing gears
4 General 4.1 System considered For manufacturer’s factory testing, the gear unit shall be measured and tested in such a manner as to minimize, as far as possible, effects of the system (see Annex B). For in-field service testing, the driver and driven machine components, mounting and other factors can influence the vibration of the gear unit. Other International Standards and vibration evaluation can be required for measuring the driver or driven machine when operating in-field service.BS ISO 20816-9 pdf download.
