...Jaroslav Zapoměl; Petr Ferfecki As the radial clearance between disks and the casing of rotating machines is usually very narrow, excessive lateral vibration of accelerating rotors passing critical speeds can produce impacts between the disks and the housing. The computer modeling method...

...S. Ziaei-Rad; E. Kouchaki; M. Imregun This paper studies the effects of shaft rub on a rotating system’s vibration response with emphasis on heat generation at the contact point. A 3D heat transfer code, coupled to a 3D vibration code, was developed to predict the dynamic response of a rotor...

...Thomas Sattel; Peter Hagedorn; Joachim Schmidt In this paper the contact mechanism between stator and rotor will be considered in detail, which plays a key role in ultrasonic motors. A planar contact model for the stator-rotor interaction in traveling-wave type ultrasonic motors is derived...

... is referred to as the Lee diagram, is newly proposed, where the conventional Campbell diagram is incorporated with the concept of the infinity norm of directional frequency response matrix (dFRM) associated with a rotor with rotating and stationary asymmetry in general. The dFRM is constructed based...

... and shaft displacement, and its appropriate representation for AMB is discussed. Furthermore, by using them, the nonlinear theoretical analysis of the rigid rotor system supported by the AMB is demonstrated. The effects of the delays and other AMB parameters on the nonlinear phenomena are clarified...

...A. S. Wall; F. F. Afagh; R. G. Langlois; S. J. Zan Rotor blade sailing, which is characterized by excessive deflection of rotor blades, can be experienced by shipboard helicopters during rotor start-up and shut-down. In an attempt to model the complete ship-helicopter-rotor system in a way...

...U. H. Hegazy; M. H. Eissa; Y. A. Amer This paper is concerned with the nonlinear oscillations and dynamic behavior of a rigid disk-rotor supported by active magnetic bearings (AMB), without gyroscopic effects. The nonlinear equations of motion are derived considering a periodically time-varying...

...Martin Karlsson; Jan-Olov Aidanpää; Richard Perers; Mats Leijon Asymmetry in the magnetic circuit, around the air gap circumference, in a hydroelectric generator will give rise to a unbalanced magnetic pull. In this paper, a hydropower rotor system is modeled and the influence of electro-mechanical...

...A. S. Wall; R. G. Langlois; F. F. Afagh As part of a research project aimed at simulating rotor dynamic response during shipboard rotor startup and shutdown operations, a dynamic model of the ship–helicopter–rotor system that is appropriate for use in predicting rotor elastic response was developed...

...N. V. Derendyaev; A. V. Vostrukhov; I. N. Soldatov In this paper, a new method for investigation of dynamics of fluid-filled rotor systems is presented. The method consists of development of finite degrees-of-freedom (discrete) models for the rotor systems. The discrete models are physically...

...Tiesheng Zheng; Shuhua Yang; Zhonghui Xiao; Wen Zhang, Mem. ASME Based on the free boundary theory and variational method, this paper presents a Ritz method to compute the instantaneous hydrodynamic forces of a real bearing subject to any perturbed motions of the rotor. The given method manipulates...

... OF APPLIED MECHANICS . 14 Dec 2000 30 Oct 2001 25 08 2003 functionally graded materials heat conduction thermal conductivity boundary integral equations Green's function methods Galerkin method rotors Laplace equations Functionally graded materials (FGMs...

...H. A. DeSmidt, Graduate Research Assistant; K. W. Wang, Willian E. Diefenderfer Chaired Professor in Mechanical Engineering, Fellow ASME; E. C. Smith, Associate Professor of Aerospace Engineering Understanding the instability phenomena of rotor-shaft and driveline systems incorporating universal...