Skip to Main Content
 

Global Search Box

 
 
 

ETD Abstract Container

Abstract Header

Smart Journal Bearing with Controllable Radial Clearance, Design and Analysis

Farkhondeh, Shahrbanoo
http://rave.ohiolink.edu/etdc/view?acc_num=csu1497976252551497

Abstract Details

2017, Doctor of Engineering, Cleveland State University, Washkewicz College of Engineering.
This work presents an innovative design concept for a “smart journal bearing” set to operate in a stable hydrodynamic lubrication regime, despite variations in bearing speed, load, and its lubricant viscosity. The concept of controlling of the radial clearance, as presented in this work, is original and has not been proposed and discussed in previous research. The proposed bearing design allows adjusting its radial clearance for an attempt to maintain a stable bearing operation under various operating conditions. The design concept allows adjusting the radial clearance at small increments in the order of 0.001 mm. The proposed work includes a 3D model of the bearing that depicts the structural interactions of the bearing components. The 3D model is employed to conduct finite element analyses to simulate the mechanical behavior of the bearing from a structural point of view. A typical journal bearing was analyzed under a set of design parameters, namely r =1.27 cm (journal radius), c = 0.0254 mm (radial clearance), L=1.27 cm (bearing length), w = 445N (bearing load), µ = 0.028 Pascale-sec. (lubricant viscosity). A shaft speed as 3600 r.p.m was considered, and the mass supported by the bearing, m, is set to be 984.2kg. The Summerfield Number associated with the above bearing design vii parameters turn to be, S = 0.3. These combinations resulted in stable bearing operation. Subsequently, the speed was postulated to increase from 3600 r.p.m to 7200 r.p.m; thebearing was found to be unstable under the new increased speed. In order to regain stability, the radial clearance was increased from c = 0.0254 mm to 0.0358mm. The change in the radial clearance was shown to bring the bearing back to stable an operating condition. This work also presents the dynamic behavior of a Jeffcott rotor supported by two identical proposed smart bearings. Adjusting the radial clearance of the bearings showed that the peak-to-peak vibration amplitude of the rotor disk could be reduced from about 0.08 mm to about 0.03 mm.
Majid Rashidi, Ph.D. (Committee Chair)
Mounir Ibrahim, Ph.D.. (Committee Member)
Asuquo Ebiana, Ph.D. (Committee Member)
Zhiqiang Gao, Ph.D. (Committee Member)
Ulrich Zurcher, Ph.D. (Committee Member)
114 p.
Mechanical Engineering
smart, journal bearing, radial clearance, controllable, optimization,

Recommended Citations

Citations

  • Farkhondeh, S. (2017). Smart Journal Bearing with Controllable Radial Clearance, Design and Analysis [Doctoral dissertation, Cleveland State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=csu1497976252551497

    APA Style (7th edition)

  • Farkhondeh, Shahrbanoo. Smart Journal Bearing with Controllable Radial Clearance, Design and Analysis . 2017. Cleveland State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=csu1497976252551497.

    MLA Style (8th edition)

  • Farkhondeh, Shahrbanoo. "Smart Journal Bearing with Controllable Radial Clearance, Design and Analysis ." Doctoral dissertation, Cleveland State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1497976252551497

    Chicago Manual of Style (17th edition)

csu1497976252551497
1,051
© 2017, all rights reserved.
This open access ETD is published by Cleveland State University and OhioLINK.