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  • BSI
    BS ISO 21940-31:2013 Mechanical vibration. Rotor balancing - Susceptibility and sensitivity of machines to unbalance
    Edition: 2013
    $435.35
    / user per year

Description of BS ISO 21940-31:2013 2013

This part of ISO 21940 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. This part of ISO 21940 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 this part of ISO 21940.



Standard NumberBS ISO 21940-31:2013
TitleMechanical vibration. Rotor balancing - Susceptibility and sensitivity of machines to unbalance
StatusRevision Underway
Publication Date2013-08-31
ReplacesBS ISO 10814:1996
Identical National Standard OfISO 21940-31:2013
DescriptorsVibration control, Vibration, Rotational motion, Sensitivity, Rotating parts, Vibration testing, Rotating electric machines, Machine tools, Classification systems, Rotors (mechanical), Equations, Rotors (electric), Vibration dampers, Balancing
ICS21.120.40 Balancing and balancing machines
CommitteeGME/21/5
ISBN978 0 580 79296 0
PublisherBSI
Pages30

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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