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Keywords: shafts
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Journal Articles
Article Type: Research Papers
J. Vib. Acoust. February 2012, 134(1): 011002.
Published Online: December 22, 2011
... cylindrical shell with ring stiffeners and equally spaced bulkheads. The cylinder is closed at each end by circular plates and conical end caps. The forces from the propeller are transmitted to the hull by a rigid foundation connected to the propeller shaft. Inertial actuators are used as the structural...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. December 2011, 133(6): 061012.
Published Online: November 28, 2011
... and shafts designed to transmit thrust. The total axial load is carried by the single thrust bearing. Any design, manufacture, or assembly error in this component (thrust bearing) would certainly influence the functionality of the entire machine. The analyzed combi-bearing is an existing machine component...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. December 2011, 133(6): 061005.
Published Online: October 12, 2011
...Arnaldo J. Mazzei, Jr.; Richard A. Scott The effect of functionally graded materials (FGMs) on resonances of bending shafts under time-dependent axial loading is investigated. The axial load is taken to be a sinusoidal function of time and the shaft is modeled via an Euler–Bernoulli beam approach...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. August 2011, 133(4): 041004.
Published Online: April 6, 2011
... may include multiple gear meshes, flexible shafts, rolling element bearings, housing structures, and other deformable components. Özgüven , H. N. , and Houser , D. R. , 1988 , “ Mathematical Models Used in Gear Dynamics—A Review ,” J. Sound Vib. 0022-460X , 121 ( 3 ), pp. 383...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. June 2011, 133(3): 031008.
Published Online: March 29, 2011
... the propeller are transmitted to the hull through the shaft and a rigid foundation, resulting in axisymmetric excitation of the hull. The hull surface motion is mainly in the axial direction with a small radial component due to the coupling between the two orthogonal shell displacements. The sound pressure...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. October 2010, 132(5): 051009.
Published Online: August 26, 2010
...Timothy W. Dimond; Amir A. Younan; Paul Allaire There is a significant disagreement in the literature concerning the proper evaluation of the experimental identification and frequency response of tilting-pad journal bearings (TPJBs) due to shaft excitations. Two linear models for the frequency...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. October 2010, 132(5): 051008.
Published Online: August 20, 2010
... of three distinct machine characteristics, which combine to create a case of the Morton effect. Some example calculations are shown illustrating the possible types of spiral vibration. In addition, an analytical approach is described for estimating the magnitude of the shaft temperature difference...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. February 2010, 132(1): 011011.
Published Online: February 1, 2010
...Yukio Ishida; Jun Liu Unstable vibration occurs in the vicinities of the major critical speeds of asymmetrical shaft and rotor systems. It occurs also in a wide rotational speed range higher than the major critical speed of a shaft with a hollow disk partially filled with liquid. The occurrence...
Topics: Rotors, Springs
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. August 2009, 131(4): 041001.
Published Online: May 28, 2009
...H. A. DeSmidt This research explores the use of automatic balancing (AB) devices or “autobalancers” for imbalance vibration suppression of flexible shafts operating at supercritical speeds. Essentially, an autobalancer is a passive device consisting of several freely moving eccentric masses...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. February 2009, 131(1): 011012.
Published Online: January 8, 2009
... + D is the matrix of modal constants. Thus, Eq. 16 is a basic formula to obtain modal constants by the eigensystem realization algorithm ( 17 ). The r-dFRFs are known to be sensitive to the asymmetry of a rotor system ( 16 ). Hence, if a crack develops in a rotating shaft, the transverse...
Journal Articles
Article Type: Technical Briefs
J. Vib. Acoust. October 2008, 130(5): 054502.
Published Online: August 12, 2008
...Yi-Jui Chiu; Shyh-Chin Huang The influence on the coupled vibrations among shaft, disk, and blades of a rotor system due to a cracked blade was investigated analytically. On the shaft-disk-blade system, without a cracked blade, there exist three types of coupled modes, shaft disk blade (SDB), disk...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. August 2008, 130(4): 041004.
Published Online: July 1, 2008
...Yukio Ishida; Jun Liu; Tsuyoshi Inoue; Akihiro Suzuki An asymmetrical shaft supported by single-row deep groove ball bearings with clearance has nonlinear spring characteristics, rotating stiffness difference in shaft, and static stiffness difference in support at the shaft ends. When...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. June 2008, 130(3): 031012.
Published Online: May 14, 2008
... ends, the geometric nonlinearity appears due to the stiffening effect in elongation of the shaft if the movements of the bearings in the longitudinal direction are restricted. The nonlinearity is symmetric when the rotor is supported vertically, and is asymmetric when it is supported horizontally...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. October 2007, 129(5): 590–600.
Published Online: February 26, 2007
... in motorcycles. The model consists of the power-train assembly, modeled as a six-degree-of-freedom (DOF) rigid body; the swing arm assembly, connected to the power-train through a coupler shaft assembly; and the frame, connected to the power-train by elastomeric mounts and to the swing-arm through the rear...
Journal Articles
Article Type: Technical Briefs
J. Vib. Acoust. June 2007, 129(3): 386–389.
Published Online: January 5, 2007
... by the axial force component has a significant influence on the dynamic response of the shaft, even when the axial force and speed are low and, hence, must be considered in such problems as turning operations. The cutting force in a turning or milling operation is not constant and has been modeled...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. April 2006, 128(2): 143–147.
Published Online: July 21, 2005
...S. M. Yang; G. J. Sheu It has been stated that a uniform rotating shaft in the Rayleigh beam model has only a finite number of critical speeds and precession modes. This paper presents a controller design of optimal sensor/actuator location and feedback gain for steady state unbalance response...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. August 2005, 127(4): 408–415.
Published Online: July 7, 2004
...Q. Ding; A. Y. T. Leung An experimental test rig is built to verify the dynamics of a multi-bearing rotor. It consists of two flexibly coupled shafts and is connected to a motor at one end via a flexible coupling. Each of the shafts is supported at the ends by two hydrodynamic bearings...