Rotordynamics '92

Designers and operators of rotating machinery have to deal with the effects of machine vibration and wear. The increasing demands for quieter machine operation, longer machine life and a greater efficiency of operation have led to the use of sophisticated design aids. Research into rotating machinery is therefore of substantial and increasing importance. Rotordynamics '92 provides a record of some of the most recent research methods and results relating to the design and operation of rotating machinery. The conference is international in character and draws on research from a wide range of respected sources.

List of Papers Presented.- Keynote Paper Session.- A brief history of rotor dynamics.- Session 1 Balancing.- Theoretical and practical aspects in the field balancing of large turbogenerator rotors.- Active balancing of a high speed rotor in magnetic bearings.- Session 2 Torsion.- A new generation of torsional stress analysers for turbine-generators.- Coupled axial-torsional vibration in turbine generator rotors.- Nonstationary torsional vibrations during clutch operation.- Session 3 Cracked Structures.- A finite element model for transverse cracks in rotors including some fracture mechanics aspects.- The effects of a transverse crack on the dynamics of a circular shaft.- Vibrations of cracked rotating blades.- Session 4 Condition Monitoring I.- Development of computerised on-line condition monitoring of rotating machinery — a custom based approach.- An expert system of crack monitoring and diagnosing for rotating machines.- Alignment identification of multi-bearing rotor systems.- Smart rotors.- Fuzzy input-neural net adoptive expert systems for rotor diagnosis and prognosis.- Session 5 Stability.- Plain bearing stabilisation using swirl injection.- Stability analysis for a novel design of low impedance hydrodynamic bearing.- On the performance and stability of magnetic bearings.- Session 6 Seals.- Identification of friction factors for modelling the exciting forces caused by flow in labyrinth seals.- Physical modelling and data analysis of the dynamic response of a flexibly mounted rotor mechanical seal.- The relevance of the dynamic behaviour of the supporting structure in calculating critical speeds of multistage centrifugal pumps with interstage seals.- Session 7 Analytical Methods I.- The FEM development of a general, hollow conical shaft element for use in transfer matrix analysis of rotor-bearing systems: part I — formulation of the model.- The FEM development of a general, hollow conical shaft element for use in transfer matrix analysis of rotor-bearing systems: part II — analysis results and experimental correlation.- Response of a discontinuously nonlinear rotor system.- Session 8 Condition Monitoring II.- A PC-based evaluation and monitoring system for rotating machinery.- Some effects of the emerging science of design on the design of turbomachinery using a computer-based design model in conjunction with a knowledge-based expert system.- The organisation and use of knowledge-based expert systems in the computer-based design of turbomachinery.- Session 9 Geared Systems.- Optimising parameters in gear hob manufacturing to reduce gear transmission vibration and wear.- Finite element contact analysis of the cone roller enveloping worm gearing and stress computation.- Vibrational behaviour of rotors with gear couplings in case of insufficient coupling lubrication.- Session 10 Analytical Methods II.- On discrete-continuous modelling of the rotating systems for a non-linear torsional vibration analysis.- The rotary motion of a three degree of freedom manipulator linkage.- Physical interpretation and some properties of complex eigenvectors in rotordynamics by a time domain approach.- The evaluation of the safety of the shaft system of the large turbine generator set.- Session 11 Bladed Systems.- Vibration reduction of blading using interconnecting elements.- Vibration characteristics of an axial blading with different types of coupling links.- Session 12 Case Studies.- The use of finite element method to solve vibration problems on vertical pumps.- The influence of pulsating mechanical loads on acoustic noise generated by AC induction motors.- Dynamics of electric submersible pumps.- High vibration on a 90MW gas turbine-generator due to a supporting structure resonance.- Study on torsional shaft vibration response of turbine-generator unit.- Session 13 Vibration Control.- Wide band active vibration controller for an out-of-balance rotor.- Vibration control of a flexible rotor suspended by active electromagnetic bearings.- Reduction of periodic rotating vibration using the repetitive control in the rotating servo system.- Session 14 Bearings I.- Steady-state analysis of a novel variable impedance oil film bearing.- Influence of elasticity and geometrical profile on dynamic transmissibility of connecting-rod bearing.- Vibration control in rotating machinery by the use of accumulators or aerated lubricants.- Session 15 Fluid Effects.- Modelling of recirculation in axial flow pumps.- Finite element integration of the bulk-flow equations.- A contribution to the dynamic simulation of nonlinear rotating machines with fluid dynamical coupling elements.- Session 16 Bearings II.- A consideration of damping in rotors supported by tilting-pad bearings.- The response of a spherical journal bearing to rotor unbalance.- Influence of ball bearing stiffness on squeeze film behaviour, including fluid flow turbulence and inertia effects.