Rotating machines and associated triboelements are ubiquitous in industrial society, playing a central role in power generation, transportation, and manufacturing. Unfortunately, these systems are susceptible to undesirable contact (i.e., rub) between the rotor and stator, which is both costly and dangerous. These adverse effects can be alleviated by properly applying accurate real-time diagnostics. The first step toward accurate diagnostics is developing rotor–stator rub models which appropriately emulate reality. Previous rotor–stator rub models disavow the contact physics by reducing the problem to a single esoteric linear contact stiffness occurring only at the point of maximum rotor radial deflection. Further, the contact stiffness is typically chosen arbitrarily, and as such provides no additional insight into the contacting surfaces. Here, a novel rotor–stator rub model is developed by treating the strongly conformal curved surfaces according to their actual nature: a collection of stochastically distributed asperities. Such an approach is advantageous in that it relies on real surface measurements to quantify the contact force rather than a heuristic choice of linear contact stiffness. Specifically, the elastoplastic Jackson–Green (JG) rough surface contact model is used to obtain the quasistatic contact force versus rotor radial deflection; differences and similarities in contact force between the linear elastic contact model (LECM) and JG model are discussed. Furthermore, the linear elastic model's point contact assumption is assessed and found to be inaccurate for systems with small clearances. Finally, to aid in computational efficiency in future rotordynamic simulation, a simple exponential curve fit is proposed to approximate the JG force–displacement relationship.
Skip Nav Destination
Article navigation
October 2016
Research-Article
Rough Surface Contact of Curved Conformal Surfaces: An Application to Rotor–Stator Rub
Philip Varney,
Philip Varney
Woodruff School of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: pvarney3@gatech.edu
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: pvarney3@gatech.edu
Search for other works by this author on:
Itzhak Green
Itzhak Green
Professor
Woodruff School of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: itzhak.green@me.gatech.edu
Woodruff School of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: itzhak.green@me.gatech.edu
Search for other works by this author on:
Philip Varney
Woodruff School of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: pvarney3@gatech.edu
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: pvarney3@gatech.edu
Itzhak Green
Professor
Woodruff School of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: itzhak.green@me.gatech.edu
Woodruff School of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30318
e-mail: itzhak.green@me.gatech.edu
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 1, 2015; final manuscript received August 30, 2015; published online June 15, 2016. Assoc. Editor: Robert L. Jackson.
J. Tribol. Oct 2016, 138(4): 041401 (7 pages)
Published Online: June 15, 2016
Article history
Received:
June 1, 2015
Revised:
August 30, 2015
Citation
Varney, P., and Green, I. (June 15, 2016). "Rough Surface Contact of Curved Conformal Surfaces: An Application to Rotor–Stator Rub." ASME. J. Tribol. October 2016; 138(4): 041401. https://doi.org/10.1115/1.4032786
Download citation file:
Get Email Alerts
Related Articles
Impact Phenomena in a Noncontacting Mechanical Face Seal
J. Tribol (March,2017)
Performance Degradation due to Blade Surface Roughness in a Single-Stage Axial Turbine
J. Turbomach (January,2005)
On the Prediction of Axisymmetric Rotating Flows by a One-Equation Turbulence Model
J. Fluids Eng (June,2000)
Turbine Blade Surface Deterioration by Erosion
J. Turbomach (July,2005)
Related Proceedings Papers
Related Chapters
Other Components and Variations
Axial-Flow Compressors
Analysis on Double Resonances of Generator Stator and Rotor Coupling Rigid Model
International Conference on Computer Technology and Development, 3rd (ICCTD 2011)
15 Year Old Polyvinyl Chloride (PVC) Sewer Pipe; A Durability and Performance Review
Buried Plastic Pipe Technology