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Keywords: rotors
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Journal Articles
Article Type: Research Papers
J. Appl. Mech. March 2011, 78(2): 021001.
Published Online: November 4, 2010
...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...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. November 2010, 77(6): 061010.
Published Online: August 20, 2010
...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...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. May 2010, 77(3): 031014.
Published Online: February 23, 2010
...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...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. March 2010, 77(2): 021012.
Published Online: December 14, 2009
... 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...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. January 2010, 77(1): 011005.
Published Online: September 24, 2009
... 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...
Journal Articles
Article Type: Research Papers
J. Appl. Mech. November 2008, 75(6): 061004.
Published Online: August 15, 2008
...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...
Topics: Blades, Rotors
Journal Articles
Article Type: Research Papers
J. Appl. Mech. January 2008, 75(1): 011011.
Published Online: January 14, 2008
...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...
Journal Articles
Article Type: Technical Papers
J. Appl. Mech. November 2007, 74(6): 1178–1186.
Published Online: February 8, 2007
...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...
Journal Articles
Article Type: Technical Papers
J. Appl. Mech. November 2007, 74(6): 1104–1113.
Published Online: January 4, 2007
...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...
Journal Articles
Article Type: Technical Papers
J. Appl. Mech. July 2006, 73(4): 580–589.
Published Online: November 4, 2005
...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...
Journal Articles
Article Type: Technical Papers
J. Appl. Mech. March 2004, 71(2): 219–224.
Published Online: May 5, 2004
...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...
Journal Articles
Article Type: Technical Papers
J. Appl. Mech. July 2003, 70(4): 543–549.
Published Online: August 25, 2003
... ] The second numerical example is a rotor with eight mounting holes. Due to the eightfold symmetry, only one-eighth of the rotor is modeled, as drawn in Fig. 4 . The grading direction for the rotor is parallel to its line of symmetry, which is taken as the z -axis, and the thermal conductivity for the rotor...
Journal Articles
Article Type: Technical Papers
J. Appl. Mech. May 2002, 69(3): 261–273.
Published Online: May 3, 2002
...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...