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BS ISO 21940-11:2016

BS ISO 21940-11:2016

$167.15

Mechanical vibration. Rotor balancing – Procedures and tolerances for rotors with rigid behaviour

Published By Publication Date Number of Pages
BSI 2016 40
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PDF Catalog

PDF Pages PDF Title
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Pertinent aspects of balancing
4.1 General
4.2 Representation of the unbalance
10 4.3 Unbalance effects
4.4 Reference planes for unbalance tolerances
12 4.5 Correction planes
4.5.1 General
4.5.2 Rotors which need one correction plane only
4.5.3 Rotors which need two correction planes
4.5.4 Rotors with more than two correction planes
4.6 Permissible residual unbalance
13 5 Similarity considerations
5.1 General
5.2 Permissible residual unbalance and rotor mass
14 5.3 Permissible residual specific unbalance and service speed
6 Specification of unbalance tolerances
6.1 General
6.2 Derivation of the unbalance tolerances
15 6.3 Balance quality grade G
6.3.1 Classification
6.3.2 Special designs
18 6.3.3 Permissible residual unbalance
6.4 Experimental evaluation
6.5 Unbalance tolerances based on bearing forces or vibrations
6.5.1 Bearing forces
19 6.5.2 Vibrations
6.6 Methods based on established experience
7 Allocation of permissible residual unbalance to tolerance planes
7.1 Single plane
7.2 Two planes
7.2.1 General
20 7.2.2 Limitations for inboard rotors
7.2.3 Limitations for outboard rotors
21 8 Allocation of unbalance tolerances to correction planes
8.1 General
22 8.2 Single plane
8.3 Two planes
9 Assembled rotors
9.1 General
9.2 Balanced as a unit
9.3 Balanced on component level
23 10 Accounting for errors in the verification of permissible residual unbalances
10.1 General
10.2 Unbalance tolerance
10.3 Combined error of unbalance measurements
10.4 Verification of the permissible residual unbalance
10.4.1 General
24 10.4.2 Unbalance readings within tolerance
10.4.3 Unbalance readings out of tolerance
10.4.4 Region of uncertainly
25 Annex A (informative) Example of the specification of permissible residual unbalance based on balance quality grade G and allocation to the tolerance planes
29 Annex B (informative) Specification of unbalance tolerances based on bearing force limits
31 Annex C (informative) Specification of unbalance tolerances based on established experience
33 Annex D (informative) Rules for allocating unbalance tolerances from tolerance planes to correction planes
36 Bibliography

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BS ISO 21940-11:2016
$167.15