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Ahmet Kahraman

Professor


B.S. 1984, Middle East Technical University, Turkey
M.S. 1986, Middle East Technical University, Turkey
Ph.D. 1990, Ohio State University

Room E309
201 W. 19th Ave.
Columbus, OH 43210

614-292-4678

Email: kahraman.1

Web site: http://www.gearlab.org/
Thrust Area(s): Applied Mechanics, Dynamics and Controls

Research

Dr. Kahraman is a Professor of Mechanical Engineering and Director of Gleason Gear and Power Transmission Laboratories, and the Gear Dynamics and Gear Noise Research Laboratory. He is the chairman of the ASME Power Transmission and Gearing Committee and the Chairman of the ASME 10th International Power Transmission and Gearing Conference, which will be held in September 2007 in Las Vegas, Nevada.

Dr. Kahraman's research group focuses on issues associated with power transmission and gearing. Research projects aim at bringing a fundamental understanding to the behavior of gear systems and drive train components commonly used in automotive, aerospace, rotorcraft, off-highway and industrial applications. Several aspects of gear and power transmission systems are investigated in these projects, including dynamics and vibration modeling of gear systems, gear and transmission efficiency, engineered surfaces, gear tribology and wear, contact and bending fatigue modeling, gear design and analysis, measurement and metrology, and hypoid gearing.

Dr. Kahraman has nearly 10 years of industrial gear and transmission research experience (1990-1999), while working as a senior researcher and later as an engineering manager for General Motors Powertrain Group.

Dr. Kahraman's research group has been sponsored by a gear research consortium of more than 45 industrial companies, and through individually sponsored projects by a number of agencies and companies, including NASA, Army Research, OAI, Bell Helicopter, Sikorsky, Boeing, GM, Borg Warner, American Axle and Manufacturing, DaimlerChrysler, Ford and Mazda.

Selected Publications

  1. Xu, H., Kahraman, A., Anderson, N.E., Maddock, D. “Prediction of Mechanical Efficiency of Parallel-axis Gear Pairs,” Journal of Mechanical Design, 129, 58-68, 2007.
  2. Tamminnana, V. K, Kahraman A. and Vijayakar, S. “On the Relationship between the Dynamic Factors and Dynamic Transmission Error of Spur Gear Pairs,” ASME Journal of Mechanical Design, 129, 75-84, 2007.
  3. Ma, Q., Kahraman, A., Perret-Liaudet, J., and Rigaud, E., “Steady-state Dynamic Response of an Sphere-plane Interface with Contact Loss,” ASME Journal of Applied Mechanics, 2007.
  4. Ma, Q. and Kahraman, A., “Subharmonic Motions of a Mechanical Oscillator with Periodically Time-varying, Piecewise Non-linear Stiffness,” Journal of Sound and Vibration, 294(3) 924-636, 2006.
  5. Kahraman, A., Bajpai, P., and Anderson, N., “Impact of Tooth Profile Deviations on Helical Gear Wear,” ASME Journal of Mechanical Design, 127, 656-663, 2005.
  6. Ma, Q. and Kahraman, A., “The Forced Dynamic Response of a Mechanical Oscillator with Periodically Time-varying, Piecewise Non-linear Stiffness,” Journal of Sound and Vibration, 284, 893-914, 2005.
  7. Al-Shyyab, A. and Kahraman, A. “Non-Linear Dynamic Analysis of a Multi-Mesh Gear Train using Multi-term Harmonic Balance Method: Period-one Motions,” Journal of Sound and Vibration, 284, 151-172, 2005.
  8. Al-Shyyab, A. and Kahraman, A. “Non-Linear Dynamic Analysis of a Multi-Mesh Gear Train using Multi-term Harmonic Balance Method: Subharmonic Resonances,” Journal of Sound and Vibration, 279, 417-451, 2005.
  9. Kahraman, A., Ligata, H., Kienzle, K., and Zini, D., “A Kinematics and Power Flow Analysis Methodology for Automatic Transmission Planetary Gear Trains,” ASME Journal of Mechanical Design, 126, 1071-1081,2004.
  10. Bodas, A. and Kahraman, A., “Influence of Carrier and Gear Manufacturing Errors on the Static Load Sharing Behavior of Planetary Gear Sets,” JSME International Journal, Series C, 47(3), 908-915, 2004
  11. Kubur, M, Kahraman, A., Zini, D., and Kienzle, K., “Dynamic Analysis of a Multi-shaft Helical Gear Transmission by Finite Elements: Model and Experiment,” ASME Journal of Vibrations and Acoustics, 126, 398-406, 2004.
  12. Moraru, L., Keith Jr., T.G., and Kahraman, A, “Aspects Regarding the Use of Probabilistic Models for Isothermal Full Film Rough Line Contacts,” Tribology Transactions, 47, 386-395, 2004
  13. Bajpai, P., Kahraman, A., and Anderson, N. E., “A Surface Wear Prediction Methodology for Parallel Axis Gear Pairs,” ASME Journal of Tribology, 126, 597-604, 2004.
  14. Krantz, T. and Kahraman, A. “An Experimental Investigation of the Influence of the Lubricant Viscosity and Additives on Gear Wear,” Tribology Transactions, 47, 138-148, 2004.
  15. Yuksel, C. and Kahraman, A., “Influcence of Tooth Profile Wear on Dynamic Tooth Loads of a Planetary Gear Set,” Mechanisms and Machine Theory, 39, 695-715, 2004.
  16. Kahraman, A., Kharazi, A. A., and Umrani, M., “A Deformable Body Dynamic Analysis of Planetary Gears with Thin Rims,” Journal of Sound and Vibration, 262, 752-768, 2003.
  17. Cioc, C., Cioc, S., Kahraman, A, and Keith, T., “A Non-Newtonian, Thermal EHL Model of Contacts with Rough Surfaces,” Tribology Transactions, 45, 556-562, 2002. Winner of the 2004 STLE Wilbur Deutsch Memorial Award.
  18. Wagaj, P. and Kahraman, A., “Influence of Tooth Profile Modification on Helical Gear Durability,” ASME Journal of Mechanical Design, 124, 501-510, 2002.
  19. Kahraman, A. and Vijayakar, S., "Effect of Internal Gear Flexibility on the Quasi-Static Behavior of a Planetary Gear Set," ASME Journal of Mechanical Design, 123, 408-415, 2001.
  20. Kahraman, A., "Free Vibration Characteristics of Compound Planetary Gear Sets," Mechanisms and Machine Theory, 36, pp. 953-971, 2001.

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