Nov 12, 2008 from the viewpoint of nonlinear dynamics, the stability and bifurcation of the rotor dynamical system supported in gas bearings are investigated. Custom rotordynamic software various special analysis software needs can be developed for particular needs and the software provided to the end user with a manual. This document introduced dynamic behavior of a rotor of a disc rotor laval having a transverse crack in the elastic axis. Rotordynamics module analyze the dynamics of rotating machinery with the rotordynamics module. When purchasing a pump, particularly an engineered or custom as opposed to standard pump, it is important to properly evaluate its rotordynamic behavior, to avoid turnkey. Data collection and analysis software development for rotor. Students also may use the sw for selfinstruction purposes. The video gives a general introduction to the rotor dynamics software madyn 2000. Nonlinear dynamics of jeffcott rotors with air exciting. Developed for the working engineer, dyrobes offers complete rotordynamic analysis, vibration analysis, bearing performance and balancing calculations based in finite element analysis. The effect of coupled lateral and torsional vibrations of. Rotordynamics, also known as rotor dynamics, is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating. Flexibility matrix of the rotor with slant crack is developed and the stiffness coefficients based on the flexibility values are used in the.
Building a jeffcott rotor model with dyrobes peter gunter. General introduction to the rotor dynamics software madyn 2000. October 2831, 20 leonardo hotel cologne koln, germany 5 building on the 1 st and 2nd seminar day, the 3rd day will also bring the technology together by the demonstration and application of advanced software to bearings and rotor dynamics problems. A bifurcation analysis of the rotor system is carried out by means of the software tchat. I use the package myself during teaching rotordynamics.
Nonlinear dynamics of jeffcott rotors with air exciting vibration force. It is commonly used to analyze the behavior of structures ranging from jet engines and steam turbines to auto engines and computer disk storage. Rotordynamics project gutenberg selfpublishing ebooks. Responsedependent nonlinear breathing crack model is used to evaluate unbalance response of the cracked rotor. Rotor dynamics video course turbomachinery design software. Spin testing, labview, crack detection, rotor, jeffcott, sensors, health monitoring 1. Jul 20, 2018 lets consider a lavaljeffcott rotor that consists of a massless shaft and single disk supported by two identical bearings on ends with symmetric damping and stiffness. The dyrobes program will be used to illustrate the characteristics of the extended jeffcott rotor on flexible supports and more complex rotors. A jeffcott rotor model in yz plane the jeffcott rotor model consists of a simply supported flexible massless shaft with a rigid thin disc. The singlemass jeffcott rotor was first addressed by h. Rotor dynamics is a specialized branch of applied mechanics concerned with the behavior and. He is currently involved in the design, testing, modification, and installation of rotating. Dynamic and control analysis of a smart rotor by combining the ansys and matlab software.
Building a jeffcott rotor model with dyrobes youtube. Malcolm leader is a turbomachinery consultant and owner of applied machinery dynamics in dickinson, texas. Rotordynamics, also known as rotor dynamics, is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. In section 2, the jeffcott rotor is analyzed using dyrobes. The effect of coupled lateral and torsional vibrations of an. Empowering our customers with xlrotor, you can analyze any rotating machine quickly and accurately. The rotor dynamics package uses a finiteelement based formulation for performing damped and undamped lateral natural frequencies, mode shapes, stability, unbalance response, and timetransient response of rotating systems. Jun 09, 2015 building a jeffcott rotor model with dyrobes peter gunter.
Expert input parameters used for simulation of special cases and requires knowledge of the. Paper dyrobes a revolution in rotor dynamics software. This software package was written mostly during the summers of 1995,1998 and some bugs are. Rma develops and supports software for rotating machinery analysis. Two types of rotor models are discussed in this chapter. Definition of rotating frame 0z, c centre of the rotor, p point mass. Dyrobes is a complete rotordynamics software tool that is powerful and versatile, yet easy to learn. From the viewpoint of nonlinear dynamics, the stability and bifurcation of the rotor dynamical system supported in gas bearings are investigated. Dynamic and control analysis of a smart rotor by combining. The software combines an intuitive windowsbased interface. At its most basic level, rotor dynamics is concerned with one or more mechanical structures.
Dynamics of a jeffcott rotor with slant crack sciencedirect. Because of this the development of computer programs for rotordynamics has had a different history from that of. The critical speeds, unbalance response, and transient motion of the jeffcott rotor is evaluated. Woike3 1kent state university, kent, ohio, 44242 2university of. The effect of coupled lateral and torsional vibrations of an unbalanced jeffcott rotor supported by roller bearings yupeng yu, heng liu, yuquan ni, and minqing jing proceedings of the. The code may be used for teaching students the rotor dynamics and for solving educational examples, laboratory practice support, etc. The inertial theory of the rotor dynamics has developed a specific condition for solving this problem. With this model, it was now possible to explain how a rotor could pass through a critical speed. An overview of the past, present, and possible future of rotordynamic codes is presented. Lets consider a lavaljeffcott rotor that consists of a massless shaft and single disk supported by two identical bearings on ends with symmetric damping and stiffness. If, in addition, the rotor is axisymmetric, the properties of the rotor do not depend on rotation angle. The effect of coupled lateral and torsional vibrations of an unbalanced jeffcott rotor supported by roller bearings yupeng yu, heng liu, yuquan ni, and minqing jing proceedings of the institution of mechanical engineers, part k. Dynamic behaviour of the laval rotor with a transverse crack92008. Because of this the development of computer programs for rotordynamics has had a different history from that of the mainstream of structural dynamics.
The jeffcott rotor is a mathematical idealization that. 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. The gyroscopic matrix, which depends on the rotational velocity or velocities of the analysis model. We investigate complex dynamics occurring in a nonsmooth model of a jeffcott rotor with a bearing clearance. Numerical method and bifurcation analysis of jeffcott rotor. Lateral rotor vibration lrv is radialplane orbital motion of the rotor spin axis. Almost all machines have something that rotates or vibrates, so rotor dynamics is a large field of mechanical engineering. The history of rotordynamics is replete with the interplay of theory and practice. Introduction to rotordynamic fe analysis, part1 youtube. A jeffcott rotor model in yz plane the jeffcott rotor model consists of a simply supported flexible massless shaft with a rigid thin disc mounted at the midspan as shown in figure 1. First, the dynamical model of gas bearing jeffcott rotor system is given, and the finite element method is used to approach the unsteady reynolds equation in order to obtain gas film forces. Data collection and analysis software development for rotor dynamics testing in spin laboratory ali abdul aziz 1, daniel arble 2 and mark woike 3 1kent state university, kent, ohio, 44242 2university of. He was educated at trinity college, dublin, and was called to the english bar at the inner temple in february 1826.
Rotor dynamics is the branch of engineering that studies the lateral and torsional vibrations of rotating shaft, with the objective of predictive the rotor vibrations and. The analysis of a smart jeffcott rotor with direct velocity. Lees cambridge university press, 2010 rotordynamics software manual 1. Developed for the working engineer, dyrobes offers complete rotordynamic analysis, vibration analysis. Rotor dynamics is the branch of engineering that studies the lateral and torsional vibrations of rotating shaft, with the objective of predictive the rotor vibrations and containing the vibration level under an acceptable limit. Madyn 2000 for rotor dynamics by delta js 1,580 views. It modifies the apparant stiffness of the model and can produce unstable. The rotating damping matrix, also depends upon the rotational velocities.
Rostab, rotormap, rosync and roresp integrated by rotlats user. The study of the dynamical characteristics of the jeffcott rotor is the starting point for the fundamentals of flexible rotor bearing dynamics. This software package was written mostly during the summers of 1995,1998 and some bugs are thus 10 years old. The transverse stiffness, k, of a simply supported shaft is expressed as 3 load ei48 k. The analysis of a smart jeffcott rotor with direct. Software exercises will be performed using softinways axstream platform and covers rotor dynamics and bearing analysis. It is commonly used to analyze the behavior of structures ranging from jet. Some parts work correctly and the graphics is reasonably. The next subparagraph deals with the influence of gravity of the whirling motion of the disk. The rotor dynamics package uses a finiteelement based formulation for performing damped and undamped lateral natural frequencies, mode shapes, stability, unbalance response, and. Dynamic and control analysis of a smart rotor by combining the ansys and matlab software piotr cupial1, mateusz koziol2 department of process control, faculty of mechanical engineering and robotics, agh university of science and technology, krakow, poland 2corresponding author email.
The jeffcott rotor also known as the delaval rotor in europe is a simplified lumped parameter model used to solve these equations. Some parts work correctly and the graphics is reasonably nice. A simple jeffcott rotor model of a rotor with a slant crack is presented. Rotor dynamics software, description of some linear and nonlinear. Xlrotor is the worlds best rotordynamic software because it blends unmatched easeofuse with extensive analytical features. The classical jeffcott rotor with four degrees of freedom is. Axstream rotordynamics, softinway integrated software platform for rotor dynamics, capable of lateral. Rotor dynamics toolbox rotfe file exchange matlab central. Numerical method and bifurcation analysis of jeffcott. Dynamics of continuous, discrete and impulsive systems series b.
Now, if the rotational damping effect is also included in the system, the circulatory term appears in the governing equation and causes instability. Predicting the stability of rotor systems with the comsol. This comprehensive course covers rotor dynamics analysis and bearings simulation for different types of rotors and bearings journal, thrust. The analysis of a smart jeffcott rotor with direct velocity feedback control in the supercritical range 206 journal of low frequency noise, vibration and active control figure 1a. Rotordynamics, also known as rotor dynamics, is a specialized branch of applied. Apr 30, 2014 jeffcott rotor laval shaft lavallaufer. Lets consider a laval jeffcott rotor that consists of a massless shaft and single disk supported by two identical bearings on ends with symmetric damping and stiffness. Rotordynamics design rotor bearing solutions international. In the beginning, from positions of the inertial dynamics, the jeffcott rotor rotation with a static unbalance was considered 4. Hot spot stability analysis with the rotor dynamics software madyn 2000. Bifurcation analysis of periodic orbits of a nonsmooth. Jan 14, 2020 the student community is a public forum for authorized ansys academic product users to share ideas and ask questions.
A bifurcation analysis of the rotor system is carried out by means of the software tchat, a toolbox of auto 97 allowing pathfollowing and detection of bifurcations of periodic trajectories of nonsmooth dynamical systems. Rotordynamics, also known as rotor dynamics, is a specialized branch of applied mechanics. The unbalance response of the jeffcott rotor has been described by two second order differential equations to describe the dynamical motion of the system. Rotordynamics software for predictive analyses of rotating. The student community is a public forum for authorized ansys academic product users to share ideas and ask questions. Rotor dynamics is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures. Data collection and analysis software development for. The jeffcott rotor is the most widely used theoretical model in the analysis of rotor systems. Data collection and analysis software development for rotor dynamics testing in spin laboratory ali abdulaziz1, daniel arble2 and mark r. It explains the critical speed, approach to solve rotordynamic analysis, balancing machine, campbell diagram, rotordynamic equations, jeffcott rotor, references, and types of analysis for. First the model shall be discussed after which an interpretation of the response is given. Kong, fanjin and ding, xuejun and xu, honglei and liao, ji.
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