BS ISO 21940-12:2016 – TC:2020 Edition
$246.62
Tracked Changes. Mechanical vibration. Rotor balancing – Procedures and tolerances for rotors with flexible behaviour
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 102 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 63 | Foreword |
| 65 | Introduction |
| 67 | 1 Scope 2 Normative references 3 Terms and definitions |
| 68 | 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 |
| 69 | 4.4 Response of a rotor with flexible behaviour to unbalance |
| 70 | 4.5 Aims of balancing rotors with flexible behaviour |
| 71 | 4.6 Provision for correction planes 4.7 Coupled rotors 5 Rotor configurations |
| 73 | 6 Procedures for balancing rotors with flexible behaviour at low speed 6.1 General |
| 74 | 6.2 Selection of correction planes 6.3 Service speed of the rotor 6.4 Initial unbalance 6.5 Low-speed balancing procedures 6.5.1 Procedure A — Single-plane balancing 6.5.2 Procedure B — Two-plane balancing |
| 75 | 6.5.3 Procedure C — Individual component balancing prior to assembly 6.5.4 Procedure D — Balancing subsequent to controlling initial unbalance 6.5.5 Procedure E — Balancing in stages during assembly |
| 76 | 6.5.6 Procedure F — Balancing in optimum planes 7 Procedures for balancing rotors with flexible behaviour at high speed 7.1 General 7.2 Installation for balancing |
| 77 | 7.3 Procedure G — Multiple speed balancing 7.3.1 General 7.3.2 Initial low-speed balancing 7.3.3 General procedure |
| 79 | 7.4 Procedure H — Service speed balancing |
| 80 | 7.5 Procedure I — Fixed speed balancing 7.5.1 General 7.5.2 Procedure 8 Evaluation criteria 8.1 Choice of criteria |
| 81 | 8.2 Vibration limits in the balancing machine 8.2.1 Overview 8.2.2 General 8.2.3 Special cases and exceptions 8.2.4 Factors influencing machine vibration |
| 82 | 8.2.5 Critical clearances and complex machine systems 8.2.6 Permissible vibrations in the balancing machine |
| 83 | 8.3 Residual unbalance tolerances 8.3.1 Overview 8.3.2 General 8.3.3 Limits for low-speed balancing |
| 84 | 8.3.4 Limits for multiple speed balancing 9 Evaluation procedures 9.1 Evaluation procedures based on vibration limits 9.1.1 Vibration assessed in a high-speed balancing machine |
| 85 | 9.1.2 Vibration assessed on a test facility 9.1.3 Vibration assessed on site |
| 86 | 9.2 Evaluation based on residual unbalance tolerances 9.2.1 General 9.2.2 Evaluation at low speed 9.2.3 Evaluation at multiple speeds based on modal unbalances |
| 87 | 9.2.4 Evaluation at service speed in two specified test planes |
| 89 | Annex A (informative) Cautionary notes concerning rotors when installed in-situ |
| 90 | Annex B (informative) Optimum planes balancing — Low-speed three-plane balancing |
| 92 | Annex C (informative) Conversion factors |
| 93 | Annex D (informative) Example calculation of equivalent residual modal unbalances |
| 96 | Annex E (informative) Procedures to determine whether a rotor shows rigid or flexible behaviour |
| 98 | Annex F (informative) Method of computation of unbalance correction |
| 99 | Bibliography |
