Jerry H. Griffin
William H. Brown Emeritus Professor, Mechanical Engineering
Vice President of Engineering, Blade Diagnostics Corporation
6688 Kinsman Rd
Pittsburgh, PA 15217
Professor Griffin's research includes the areas of linear and nonlinear vibration. He has special interests in predicting the amplitudes of vibratory response of rotating equipment, especially gas turbine engines and drive trains. Recent projects include developing predictive models of damping due to microslip at friction interfaces, an improved understanding of high frequency tip mode vibration in low aspect ratio blades, reduced order models of blade mistuning including aerodynamic effects and friction, more computationally efficient methods for computing the forced response of packeted blades, new mathematical methods for analyzing the effect of periodically varying inertia and stiffness on system response and more reliable methods of predicting torsional vibration in drive trains.
A number of Professor Griffin's research projects are developed in cooperation with two industrial and government consortia. He formed the GUIde Consortium on the forced response of bladed disks and is Director of the GUIde sponsored CMU Center for Bladed Disk Structures Research and Technology. The Torsional Vibration Consortium (TVC) developed software for computing the torsional vibratory response of drive trains.
EducationPh.D. 1973, California Institute of Technology
- “Friction Damping of Hollow Airfoils: Part I — Theoretical Development,” ASME Journal of Engineering for Gas Turbines and Power, Vol. 120, 1998, pp. 120-125 (with W-T. Wu and Y. El-Aini).
- “Friction Damping of Circular Motion and Its Implications to Vibration Control,” ASME Journal of Vibration and Acoustics, Vol. 113, 1991, pp. 225–229 (with C.–H. Menq).
- “Friction Damping of Two–Dimensional Motion and Its Application in Vibration Control,” Journal of Sound and Vibration, Vol. 144, 1991, pp. 427–447 (with C.–H. Menq and P. Chidamparam).
- “A Review of Friction Damping of Turbine Blade Vibration,” International Journal of Turbo and Jet Engines, Vol. 7, 1990, pp. 297–307.
- “Unstable Resonant Response of Shrouded Bladed Disks,” in Proceedings of the Third National Turbine Engine High Cycle Fatigue Conference, San Antonio, TX, February 1998 (with Y.-C. Li and M.-T. Yang).
- “A Rational Method for Optimizing Shroud Damping,” in Proceedings of the International Gas Turbine and Aeroengine Congress and Exposition, Birmingham, England, Paper No. 96-GT-402, 1996 (with R. Labelle).
- “Forced Harmonic Response of Grouped Blade Systems: Part II — Application,” ASME Journal of Engineering for Gas Turbines and Power, Vol. 118, 1996, pp. 137-145 (with L. Wagner).
Bladed Disk Assemblies (Mistuning)
- “System Identification of Mistuned Bladed Disks from Traveling Wave Response Measurements,” Proceedings of the 2003 ASME Design Engineering Technical Conferences, Chicago, IL, ASME Paper DETC 2003/VIB-48448 (with D.M. Feiner, K. Jones, J.A. Kenyon, O. Mehmed and A.P. Kurkov).
- “Frequency Veering Effects on Mistuned Bladed Disk Forced Response,” ASME Journal of Propulsion and Power, Vol. 20, September 2004, pp. 863-870 (with J.A. Kenyon and N.E. Kim).
- “Mistuning Identification of Bladed Disks Using a Fundamental Model of Mistuning—Part I: Theory,” ASME Journal of Turbomachinery, 2004, 126(1), pp. 150-158 (with D.M. Feiner).
- “Mistuning Identification of Bladed Disks Using a Fundamental Model of Mistuning—Part II: Application,” ASME Journal of Turbomachinery, 2004, 126(1), pp. 159-165 (with D.M. Feiner).
High Frequency Modes in Low Aspect Ration Blades
- “Theory and Methodology of Optimally Measuring Vibratory Strains in Closely Spaced Modes,” ASME Journal of Engineering for Gas Turbines and Power, Vol. 120, 1998, pp. 801-807 (with M.-T. Yang).
- “Resonant Response of a Tapered Beam and Its Implications to Blade Vibration,” ASME Journal of Engineering for Gas Turbines and Power, Vol. 119, 1997, p. 147-152 (with G. Balaji).
Torsional Vibration in Drive Trains
- “Modal Analysis of the Steady State Response of a Driven Periodic Linear System,” Journal of Sound and Vibration, Vol. 183, 1995, pp. 297 (with W.–T. Wu and J.A. Wickert).
- “Perturbation Method for the Floquet Eigenvalues and Stability Boundary of Periodic Linear Systems,” Journal of Sound and Vibration, Vol. 182, 1995, pp. 245-257 (with W.–T. Wu and J.A. Wickert).
- "Torsional Vibration of Drive Trains,” in Proceedings of the International Off-Highway and Powerplant Congress and Exposition, SAE Technical Paper #941697, 1994 (with W.-T. Wu, J.A. Wickert and J.B. Brown Jr.).
- “A Special Element Approach for Calculating the Vibratory Response of Adhesively Bonded and Composite Structures,” Journal of Sound and Vibration, Vol. 170, 1994, pp. 377–395 (with N. Kim).
- “Sensitivity of Bonded and Composite Beams,” Journal of Sound and Vibration, Vol. 177, 1994, pp. 71–92 (with N. Kim).
Stress Analysis and Fracture Mechanics
- “Contact Stresses in Dovetail Attachments: Finite Element Modeling,” ASME Journal of Engineering for Gas Turbines and Power, Vol. 124, January 2002, pp. 182-189 (with G.B. Sinclair, N.G. Comier and G. Meda).
- “Estimating the Importance of Cyclic Thermal Loads in Thermo–mechanical Fatigue,” International Journal of Fracture, Vol. 47, 1991, pp. 161–180 (with S.E. Cunningham).
- “On the Importance of Direct Resistance Heating in Thermo–mechanical Fatigue,” International Journal of Fracture, Vol. 46, 1990, pp. 257–270 (with S.E. Cunningham).
- “A Consortium Approach to Torsional Vibration,” in Proceedings of the ‘97 Propellers/Shafting Symposium, Virginia Beach, VA, September 1997, Society of Naval Architects and Marine Engineers, pp. 25-1–25-6.
- “The GUIde Consortium: Government, Universities, and Industry Working Together to Develop New Technologies,” in Proceedings of the 1995 International Gas Turbine and Aeroengine Congress and Exposition, Houston, TX (with S.M. Richardson).
Patents2008: “Fundamental Mistuning Model for Determining System Properties and Predicting Vibratory Response of Bladed Disks” (Forced Response Prediction)
2007: “Determination of damping in bladed disk systems using the fundamental mistuning model” (Damping Identification)
2006: “Fundamental mistuning model for determining system properties and predicting vibratory response of bladed disks” (Mistuning Identification)