Jeffcott rotor. Zhang, “Bifurcation and Chaos in a Rub-Impact Jeffcott Rotor System,” Journal of Sound and Vibration, Vol 210, pp. The simplest system that can be used to describe the dynamic behaviour of rotors is the so called Jeffcott rotor. Steady-state whirling solutions were derived, and their stability boundaries were Such possible rotor stator interaction generates three-frequency quasi-periodic oscillations. Imbalance and shaft bow in these systems can lead to decreased efficiency and increased vibrations. The simplest form of the rotor constrains the disk to a plane orthog The Jefcott rotor is a single disk symmetrically mounted on a uniform elastic shaft. Equations of a Jeffcott rotormodel are obtained assuming that | Find, The Jeffcott rotor (or Laval rotor) is a reference case useful to understand essential phenomena in rotor-dynamics. In particular, some mathematical model that are not too complex will be discussed in order to introduce some of the most A Laval-Jeffcott rotor system supported by rigid bearings is presented in this example to demonstrate the steady-state response due to shaft bow, mass imbalance, and their combined effects. The Jeffcott rotor serves as a foundational model for analyzing rotor dynamics and flexural behavior. Ensuring optimal performance and reliability in rotor-bearing systems is crucial for industrial applications. Chu and Z. A Jeffcott rotor The Jeffcott rotor natural frequency appears similar to a simple spring-mass system. In the analysis of the original Jefcott rotor, flexible or fluid film bearings were not considered. 11. , “Rotordynamic Modeling Using Bond Graphs: Modeling the Jeffcott Rotor,” IEEE Transactions on Magnetics, Vol. Ovy, “Study of Rubbing Phenomenon due to Jeffcott rotor The Jeffcott rotor (named after Henry Homan Jeffcott), also known as the de Laval rotor in Europe, is a simplified lumped parameter model used to solve these equations. A multistage compressor may be reduced to an equivalent J efcott rotor by computing the 1st critical speed and 1. G. The model consists of a massless shaft with an PDF | In this study, the dynamic behaviour of a Jeffcott rotor during startup is analysed. 41, No. These include the eccentricity [22] Campos, J. It is well known that linear analysis of a Jeffcott rotor with internal damping leads to Jeffcott rotor Chapter pp 35–91 Cite this chapter Download book PDF Dynamics of Rotating Systems. 2: THE LINEAR JEFFCOTT ROTOR. A Jeffcott rotor consists of a flexible, massless, uniform shaft mounted on two flexible bearings equidistant from a massive disk rigidly attached to the shaft. F. 1, pp. 12. E. Damping The Jeffcott rotor model is widely used in the study of rotor dynamics. 117-125. For both This study investigates horizontal and vertical oscillations of a horizontally supported Jeffcott Rotor System (JRS), emphasizing the impact of key dynamic parameters. The rotor bearing supports The Jeffcott rotor with a general nonlinear restoring force capturing higher-order stiffness effects was investigated. This chapter will be devoted to the study of the dynamic behaviour of simple rotors. Frequency response curves show that the quasi-periodic solutions created by the bouncing rotor are mainly Remark 23. It was introduced by Jeffcott in 1919 [1] and has been further discussed in [2, 3]. , Crawford, M. Critical speed is a significant threshold where rotor response amplitudes can tend to infinity. A novel approach, combining a Jeffcott rotor supported by a detailed bearing model with the generalised harmonic balance method, is The document discusses two common rotor models - a flexible rotor with rigid bearings (Laval-Jeffcott rotor) and a rigid rotor with flexible bearings. The Jeffcott rotor consists of a point mass rigidly Elementary Rotordynamics: The Jeffcott Rotor massless elastic, and possibly damped, shaft. A Jeffcott rotor Jeffcott rotor The Jeffcott rotor (named after Henry Homan Jeffcott), also known as the de Laval rotor in Europe, is a simplified lumped parameter model used to solve these equations. Several peculiar features of the vibrational behavior of rotors, like the unbalance response, self-centering, and For the Laval-Jeffcott rotor system, with flexible rotor and rigid bearings, the translational and rotational motions correspond to the first and second bending modes. and Longoria, R. 1-18, 1998. 7 The Jeffcott rotor is obviously an oversimplification of real-world rotors but, nevertheless, allows understanding and modeling, at least qualitatively, some of the most important phenomena This study explores the flexural behavior of the Jeffcott rotor, a model commonly used in rotor dynamics. The Jeffcott rotor (named after Henry Homan Jeffcott), also known as the de Laval rotor in Europe, is a simplified lumped parameter model used to solve these equations. 274-280 (2005) Diken, “Non-Linear Vibration Analysis and Subharmonic Whirl Frequencies of the Jeffcott Rotor Model”, Journal of Sound and Vibration, 243 (1), 2001, pp.


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