BS ISO 11342:1998
$167.15
Mechanical vibration. Methods and criteria for the mechanical balancing of flexible rotors
| Published By | Publication Date | Number of Pages |
| BSI | 1998 | 40 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | National foreword |
| 3 | Contents |
| 9 | Introduction 1 Scope |
| 10 | 2 Normative references 3 Definitions 4 Fundamentals of flexible rotor dynamics and balancing 4.1 General 4.2 Unbalance distribution 4.3 Flexible rotor mode shapes |
| 11 | Figure 1 Simplified mode shapes for flexible rotors on flexible supports |
| 12 | Figure 2 Examples of possible damped mode shapes 4.4 Response of a flexible rotor to unbalance |
| 13 | 4.5 Aims of flexible rotor balancing 4.6 Provision for correction planes |
| 14 | 4.7 Rotors coupled together 5 Rotor configurations |
| 17 | 6 Procedures for balancing flexible rotors at low speed 6.1 General 6.2 Selection of correction planes 6.3 Service speed of the rotor 6.4 Initial unbalance |
| 18 | 6.5 Low-speed balancing procedures |
| 19 | 7 Procedures for balancing flexible rotors at high speed 7.1 General 7.2 Installation for balancing |
| 20 | 7.3 Procedure G — Multiple-speed balancing |
| 22 | 7.4 Procedure H — Service-speed balancing 7.5 Procedure I — Fixed speed balancing |
| 23 | 8 Evaluation criteria 8.1 Choice of criteria 8.2 Vibration limits in the balancing facility |
| 25 | 8.3 Residual unbalance limits |
| 26 | 9 Evaluation procedures 9.1 Evaluation procedures based on vibration limits |
| 27 | 9.2 Evaluation based on residual unbalance limits |
| 29 | Annex A (informative) Cautionary notes concerning rotors on site A.1 Introduction A.2 Bearing misalignment A.3 Radial and axial runout of coupling faces A.4 Bearing instability Annex B (informative) Optimum planes balancing — Low-speed three-plane balancing |
| 30 | Figure B.1 Annex C (informative) Conversion factors |
| 31 | Annex D (informative) Example — Calculation of equivalent modal residual unbalance D.1 Residual unbalance calculation |
| 32 | Figure D.1 Turbine rotor Figure D.2 Run-up curve — Before balancing D.2 Influence coefficients |
| 33 | D.3 Final vibration readings D.4 Residual unbalance at low speed, 1 000 r/min D.5 Residual unbalance at 3 400 r/min D.6 Residual unbalance at 9 000 r/min |
| 34 | Annex E (informative) Procedure to determine if a rotor is rigid or flexible E.1 General E.2 Determination of whether a rotor is rigid or flexible |
| 35 | E.3 Rotor flexibility test E.4 Evaluation of flexibility test data |
| 36 | Annex F (informative) Example — Permissible equivalent modal unbalance calculation |
| 37 | Annex G (informative) A method of computation of unbalance correction Annex H (informative) Definitions from ISO 1925:1990 and ISO 1925:1990/Amd 1:1995 relating to flexible ro… |
| 39 | Annex I (informative) Bibliography |
