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ISO 21940-31:2013

Current
Current

The latest, up-to-date edition.

Mechanical vibration — Rotor balancing — Part 31: Susceptibility and sensitivity of machines to unbalance
Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English

Published date

07-08-2013

ISO 21940-31:2013 specifies methods for determining machine vibration sensitivity to unbalance and provides evaluation guidelines as a function of the proximity of relevant resonance rotational speeds to the operating speed. ISO 21940-31:2013 is only concerned with once-per-revolution vibration caused by unbalance. It also makes recommendations on how to apply the numerical sensitivity values in some particular cases.

It includes a classification system that can be applied to machines which is related to their susceptibility to a change in unbalance. Machines are classified into three types of susceptibility and five ranges of sensitivity. The sensitivity values are intended for use on simple machine systems, preferably with rotors having only one resonance speed over their entire operating speed range. The sensitivity values can also be used for machines that have more resonance speeds in their operating speed range if the resonance speeds are widely separated (e.g. by more than 20 %).

The sensitivity values given are not intended to serve as acceptance specifications for any machine group, but rather to give indications regarding how to avoid gross deficiencies as well as specifying exaggerated or unattainable requirements. They can also serve as a basis for more involved investigations (e.g. when in special cases a more exact determination of the required sensitivity is necessary). If due regard is paid to the values given, satisfactory running conditions can be expected in most cases.

The consideration of the sensitivity values alone does not guarantee that a given magnitude of vibration in operating is not exceeded. Many other sources of vibration can occur which lie outside the scope of ISO 21940-31:2013.

Committee
ISO/TC 108/SC 2
DevelopmentNote
Supersedes ISO/FDIS 21940-31 & ISO 10814. (08/2013)
DocumentType
Standard
Pages
19
PublisherName
International Organization for Standardization
Status
Current
Supersedes

Standards Relationship
BS ISO 21940-31:2013 Identical

17/30368249 DC : 0 BS ISO 20816-4 - MECHANICAL VIBRATION - MEASUREMENT AND EVALUATION OF MACHINE VIBRATION - PART 4: GAS TURBINES IN EXCESS OF 3 MW, WITH FLUID-FILM BEARINGS
BS ISO 10816-4 : 2009 MECHANICAL VIBRATION - EVALUATION OF MACHINE VIBRATION BY MEASUREMENTS ON NON-ROTATING PARTS - PART 4: GAS TURBINE SETS WITH FLUID-FILM BEARINGS
BS ISO 10816-3 : 2009 MECHANICAL VIBRATION - EVALUATION OF MACHINE VIBRATION BY MEASUREMENTS ON NON-ROTATING PARTS - PART 3: INDUSTRIAL MACHINES WITH NOMINAL POWER ABOVE 15 KW AND NOMINAL SPEEDS BETWEEN 120 R/MIN AND 15000 R/MIN WHEN MEASURED IN SITU
ISO 19859:2016 Gas turbine applications Requirements for power generation
BS ISO 20816-2:2017 Mechanical vibration. Measurement and evaluation of machine vibration Land-based gas turbines, steam turbines and generators in excess of 40 MW, with fluid-film bearings and rated speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min
ISO 7919-3:2009 Mechanical vibration — Evaluation of machine vibration by measurements on rotating shafts — Part 3: Coupled industrial machines
16/30337263 DC : 0 BS ISO 20816-2 - MECHANICAL VIBRATION - MEASUREMENT AND EVALUATION OF MACHINE VIBRATION - PART 2: LAND-BASED GAS TURBINES, STEAM TURBINES AND GENERATORS IN EXCESS OF 40 MW, WITH FLUID-FILM BEARINGS
16/30341596 DC : 0 BS ISO 10816-4 - MECHANICAL VIBRATION - EVALUATION OF MACHINE VIBRATION BY MEASUREMENTS ON NON-ROTATING PARTS - PART 4: GAS TURBINE SETS WITH FLUID-FILM BEARINGS
ISO 20816-2:2017 Mechanical vibration — Measurement and evaluation of machine vibration — Part 2: Land-based gas turbines, steam turbines and generators in excess of 40 MW, with fluid-film bearings and rated speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min
BS ISO 19859:2016 Gas turbine applications. Requirements for power generation
ISO 10816-4:2009 Mechanical vibration Evaluation of machine vibration by measurements on non-rotating parts Part 4: Gas turbine sets with fluid-film bearings

ISO 7919-4:2009 Mechanical vibration Evaluation of machine vibration by measurements on rotating shafts Part 4: Gas turbine sets with fluid-film bearings
ISO 7919-2:2009 Mechanical vibration Evaluation of machine vibration by measurements on rotating shafts Part 2: Land-based steam turbines and generators in excess of 50 MW with normal operating speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min
ISO 1940-1:2003 Mechanical vibration Balance quality requirements for rotors in a constant (rigid) state Part 1: Specification and verification of balance tolerances
ISO 1925:2001 Mechanical vibration Balancing Vocabulary

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