Turbopump rotor dynamics because of high power density and low damping in rocket turbopumps, these machines exhibit in their most extreme form a variety of vibration effects, which are either absent or masked by normal damping mechanisms in. Cad import and automatic meshing library of elements all analysis types including prestress dedicated postprocessing multispool dynamics simulation direct connection to bearing codes account for the flexibility of the supporting structure andor the disks. After the rotor and bearing properties have been illustrated, the interaction between the rotor and the bearing dynamics is investigated in a coupled analysis. Rotordynamics, also known as rotor dynamics, is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. Therefore, rotordynamic analysis becomes a vital tool for. A better understanding of rotor dynamics and support. Lubrication and bearing design, 3rd edition provides a balance of application and. In a previous paper presented on the w501 series gas turbines, it was. K is the symmetric bearing or seal stiffness matrix. Dimensionless dynamic coefficients of journal bearing. Our experience as leaders in turbo machinery and rotor dynamics analysis and design services since 1987 offers consistent results every time.
It is demonstrated that foil bearings offer a plausible replacement for oillubricated bearings in diesel truck turbochargers. October 1215, 2020 leonardo hotel koln, cologne, germany 1 4day seminar. Complete rotordynamics analysis with ansys, enabled by. Rotor bearing, finite element method, campbell diagram, natural frequency. Gordon kirk is supervisor of the rotor dynamics analysis section of the turbo products division at ingersoll rand company.
The rotor bearings are essentially two halves of one whole and are inseparable in the design process. This book presents the proceedings of the 9th iftomm international conference on rotor dynamics. He is responsible for rotor bearing design and analysis for all turbo products compressors, turbines, and hot gas expanders. Steam turbine rotor design and rotor dynamics analysis. This conference is a premier global event that brings together specialists from the university and industry sectors worldwide in order to promote the exchange of knowledge, ideas, and information on the latest developments and applied technologies in the dynamics of rotating machinery. It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage.
Pdf rotordynamic analysis of a small rotorbearing system. The rotor and bearings are essentially two halves of one whole, and are inseparable in the rotating machinery design process. The third revised and enlarged edition of the book presents an indepth study of the dynamic behaviour of rotating and reciprocating machinery. This in this study, to establishment a mathematical model of the rotor system, a seal force model with bristle interference is proposed and the nonlinear oilfilm force is applied in view of short bearing assumption.
Shows how bearing design, fluid seals, and rotor geometry affect rotordynamic behavior vibration, shaft whirling, bearing loads, and critical speeds, and describes two successful computational methods for rotordynamic analysis in terms that can be understood by. Introduction equations of motion structural analysis case studies references history and scientists history and scientists 7 27 1869 ankine r on the centrifugal force on rotating shafts steam turbines notion of critical speed 1895 oppl f, 1905 belluzo, stodola notion of supercritical speed 1919 effcott j the lateral vibration of loaded shafts in the neighborhod. Design audits of machinery rotor dynamics 2 vibration principles and phenomena throughout a machines operating range and life between turnarounds, maintaining small rotor vibration amplitudes is our basic desire. Describes the rotordynamic considerations that are important to the successful design or troubleshooting of a turbomachine. Nonlinear dynamics of elementary rotor systems with. Rotordynamics of automotive turbochargers springerlink. This is the chief concern of engineers who design large rotors. The proposed model could provide valuable reference for the design of a rotor bearing seal system. Unique and specific problems will be presented and its solution illustrated in. Singhal, in 10th international conference on vibrations in rotating machinery, 2012. In the design of rotor systems, the lateral, torsional, and axial vibrations are generally. A computer program is given for preparation of ball. For his academic achievements, he received one of the highests awards of the japanese society of mechanical engineering jsme. Measurement of rotordynamic coefficients for a hyd.
A targeted approach we fix badly designed turbo machinery. Fluid film bearings, if well designed, support static and dynamic loads, affecting the dynamic performance of rotating machinery. The book deals with torsional and bending vibrations of rotors, stability aspects, balancing and condition monitoring. A machines overall reliablity depends heavily upon its underlying rotordynamic characteristics and their robustness. It also includes disc and the bearings which supports the rotor. Application notes static and dynamic balancing of rigid. October 1215, 2020, cologne, germany a 4day seminar and workshop for engineers and technical managers involved in rotating machin ery design, operation, main tenance, diagnosis, and troubles hooting. I hired malcolm to perform a detailed rotordynamics analysis on. Practical rotordynamics and fluid film bearing design. With worldrenowned expert coauthors from academia and industry, applied tribology. A fully superconducting bearing system for flywheel.
In this chapter, an outline of modeling a rotor and the procedure of the rotor dynamics analysis are discussed. At its most basic level, rotor dynamics is concerned with one or more mechanical structures. Linear and nonlinear rotordynamics bearing design rotor balancing. Calculation of journal bearing dynamic characteristics 95 nomenclature b damping coef. His work covers vibration analysis, modal analysis and operating defection shapes, rotor dynamics modeling, vibration isolation and damping, finite element analysis and root cause failure analysis. Guidance is given for choosing the proper bearing type and. Professor yamamoto published about research papers and a number of books. Rotordynamics, also known as rotor dynamics, is a specialized branch of applied mechanics. Numerical analysis of the dynamic behavior of a rotor.
Download rotordynamics of automotive turbochargers. Insightful working knowledge of friction, lubrication, and wear in machines applications of tribology are widespread in industries ranging from aerospace, marine and automotive to power, process, petrochemical and construction. It is demonstrated that foil bearings offer a plausible replacement for oil lubricated bearings in diesel truck turbochargers. Ron is a level 5 vibration expert with 34 years of vibration experience. Although his specialization is rotor dynamics, he also worked on other areas such as structural dynamics and fracture mechanics extensively for more than 38 years. He is also coauthoring a book on fluid film lubrication. This paper is an attempt to provide a dynamic analysis of a rigid rotor gear pairhydrodynamic bearing system with journal motions in the oil film space of the bearings. In the mechanical design of a rotor, considering these characteristics, a rotor is modeled properly to carry out the rotor dynamics analysis, and an optimal geometry is determined based on the analysis results. Introduction to dynamics of rotorbearing systems includes numerous examples, from a singledegreeoffreedom system to complicated industrial rotating machinery, which serve to illustrate fundamental dynamic behaviors. Linear and nonlinear rotordynamics wiley online books. On the multiphysics modelling of rotorbearingfoundation. A typical high stress pivot failure is shown in figures 1, 2, and 3 for a spherical pivot. One attempt in this text is to bridge the knowledge bases of rotor dynamics and bearing design. Rotor dynamics laboratory at the university of virginia was contacted in 1983 by carolina.
Notes 0 introduction to fluid film bearings and seals. Unique and specific problems will be presented and its solution illustrated. In rotor design, the emphasis is on dynamics, such as the positions of critical seeds, rotor response due to excitations, and rotor stability. In rotor design, the emphasis is on dynamics such as the positions of critical speeds, rotor response due to excitations, and rotor stability. The procedure to acquire the required data and balance the rotor is as follows. Descriptions of various types of journal bearings are presented. Durango, colorado abstract this paper covers the basic aspects of journal bearings including lubrication, design and application. A mathematical model has been developed considering the kinematics of the gear pair as affected by journal motions and using a concept of an instantaneous line of action. Calculation of journal bearing dynamic characteristics. Introduction rotor dynamics is specialized branch in which study includes the lateral and torsional vibration of rotating shaft. The analysis starts by analyzing the uncoupled rotor structure. Proceedings of the 9th iftomm international conference on.
Dynamics of rotors and foundations, erwin kramer, springerverlag berlin heidelberg 1993 vibration analysis of rotors, chongwon lee, center for noise and vibration control novic, korea, 1993, springer rotordynamics of automotive turbochargerslinear and nonlinear rotordynamics bearing design rotor. To achieve the desired properties identified in step 3, it may be required to 5. Small rotor vibrations result in low stresses on the shaft, bearings. Rotordynamics of automotive turbochargers linear and nonlinear.
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