SFS-ISO 21940-12:2016:en

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This part of ISO 21940 presents typical configurations of rotors with flexible behaviour in accordance with their characteristics and balancing requirements, describes balancing procedures, specifies methods of assessment of the final state of balance, and establishes guidelines for balance quality criteria. This part of ISO 21940 can also serve as a basis for more involved investigations, e.g. when a more exact determination of the required balance quality is necessary. If due regard is paid to the specified methods of manufacture and balance tolerances, satisfactory running conditions can be expected. This part of ISO 21940 is not intended to serve as an acceptance specification for any rotor, but rather to give indications of how to avoid gross deficiencies and unnecessarily restrictive requirements. Structural resonances and modifications thereof lie outside the scope of this part of ISO 21940. The methods and criteria given are the result of experience with general industrial machinery. It is possible that they are not directly applicable to specialized equipment or to special circumstances. Therefore, in some cases, deviations from this part of ISO 21940 are possible.

Tämän julkaisun valmistelusta Suomessa vastaa Metalliteollisuuden Standardisointiyhdistys ry, puh. 09 19 231 (vaihde).

Sisällysluettelo

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Fundamentals of dynamics and balancing of rotors with flexible behaviour

4.1 General
4.2 Unbalance distribution
4.3 Mode shapes of rotors with flexible behaviour
4.4 Response of a rotor with flexible behaviour to unbalance
4.5 Aims of balancing rotors with flexible behaviour
4.6 Provision for correction planes
4.7 Coupled rotors

5 Rotor configurations
6 Procedures for balancing rotors with flexible behaviour at low speed

6.1 General
6.2 Selection of correction planes
6.3 Service speed of the rotor
6.4 Initial unbalance
6.5 Low-speed balancing procedures

7 Procedures for balancing rotors with flexible behaviour at high speed

7.1 General
7.2 Installation for balancing
7.3 Procedure G — Multiple speed balancing
7.4 Procedure H — Service speed balancing
7.5 Procedure I — Fixed speed balancing

8 Evaluation criteria

8.1 Choice of criteria
8.2 Vibration limits in the balancing machine
8.3 Residual unbalance tolerances

9 Evaluation procedures

9.1 Evaluation procedures based on vibration limits
9.2 Evaluation based on residual unbalance tolerances

Annex A Cautionary notes concerning rotors when installed in-situ (informative)
Annex B Optimum planes balancing — Low-speed three-plane balancing (informative)
Annex C Conversion factors (informative)
Annex D Example calculation of equivalent residual modal unbalances (informative)
Annex E Procedures to determine whether a rotor shows rigid or flexible behaviour (informative)
Annex F Method of computation of unbalance correction (informative)

Bibliography

Näytä kaikki

Tuoteryhmä(t)

21.120.40 Tasapainottaminen ja tasapainotuskoneet »

Sidokset

Velvoittavat viittaukset

ISO 1925 Mechanical vibration — Balancing — Vocabulary
ISO 2041 Mechanical vibration, shock and condition monitoring — Vocabulary
ISO 21940-11 Mechanical vibration — Rotor balancing — Part 11: Procedures and tolerances for rotors with rigid behaviour

Tekninen komitea

ISO/TC 108/SC 2 (SFS-julkaisut) Measurement and evaluation of mechanical vibration and shock as applied to machines, vehicles and structures »

Vahvistuspäivä

06.05.2016

Julkaisupäivä

10.05.2016

Painos

1

Sivumäärä

37

Julkaisun kieli

englanti