Randall J. Allemang, PhD

Professor, Mechanical Engineering
Director, Structural Dynamics Research Lab

TEL: (513) 556-2725
SEC: (513) 556-2720
FAX: (513) 556-3390

E-Mail: randy.allemang@uc.edu

Dr. Allemang is a member of the faculty of the Mechanical, Industrial and Nuclear Engineering Department, University of Cincinnati, where he currently also serves as Director of the Structural Dynamics Research Laboratory (UC-SDRL). Dr. Allemang has been actively involved in the area of experimental modal analysis at the University of Cincinnati, Structural Dynamics Reseach Lab for over thirty five years, pioneering the use of multiple input, multiple output estimation of frequency response functions, developing the concept of cyclic averaging, formulating the modal assurance criterion (MAC) and the enhanced frequency response function and reformulating modal parameter estimation algorithms into the unified matrix (coefficient) polynomial approach (UMPA).  During this period, Dr. Allemang has authored or co-authored over 140 technical articles, including chapters for 2 different handbooks and numerous refereed articles.  Dr. Allemang has participated in over 50 invited seminars or lectures in the United States as well as in Taiwan, Japan, Korea (NSF), India (NSF), Belgium, Germany and France, including being asked to give the keynote address at both the Leuven International Seminar on Modal Analysis (1990) and the International Modal Analysis Conference (1993). During this period, Dr. Allemang has served as principal investigator or co-principal investigator in over $2,500,000 of research with government (NASA and USAF) and commercial agencies (Boeing, General Motors, Ford, HP/Agilent, MTS, B&K, etc.).  Dr. Allemang has worked as a consultant to a number of companies in many different structural dynamics applications since 1973.   Dr. Allemang continues to serve on the Advisory Board for the International Modal Analysis Conference (Chairman, 1986-1995), is serving on the Editorial Board of Sound and Vibration Magazine, and has served as the Associate Technical Editor for Mechanical Systems and Signal Processing (MSSP) and Editor for the International Journal of Analytical and Experimental Modal Analysis (IJAEMA).  Dr. Allemang currently serves on the International Advisory Board for Experimental Mechanics, the journal for the Society of Experimental Mechanics.

Dr. Allemang is currently involved in several areas of research which includes the experimental identification of nonlinear structural systems, the development of flexible Matlab based software for modal analysis and data acquisition research, the evaluation of impedance based modeling methods and the correlation and correction of experimental and analytical dynamic models.  Dr. Allemang also served as President for the Society of Experimental Mechanics (SEM), 2003-2004, and on the Executive Board of SEM from 1998-2006.  Dr. Allemang is very active in teaching in the areas of experimental methods, vibrations and automotive design and serves as Faculty Advisor to a number of student groups at UC including the Formula SAE Team (Bearcat MotorSports), Engineering Tribunal, Tau Beta Pi and Pi Tau Sigma.

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Selected Publications and Papers

• "An Overview of Excitation, Averaging and Processing Issues for Nonlinear System Identication", Spottswood, S.M., Allemang, R.J., Mechanical Systems and Signal Processing, April, 2007 (Submitted).
• "On the Investigation of Some Parameter Identification and Experimental Modal Filtering
  Issues for Nonlinear Reduced Order Models", Spottswood, S.M., Allemang, R.J., Experimental Mechanics, April, 2007 (On-Line).
• "Unified Matrix Polynomial Approach for Operational Modal Analysis", Chauhan S.,
  Martell, R., Allemang, R.J., Brown, D.L., Proceedings, International Modal Analysis Conference, 13 pp., 2007.
• "Application of Independent Component Analysis and Blind Source Separation Techniques
  to Operational Modal Analysis", Chauhan S., Martell, R., Allemang, R.J., Brown, D.L.,
  Proceedings, International Modal Analysis Conference, 13 pp., 2007.
• "Implementation of Complex Frequency Mapping to Low Order Frequency Domain Algorithms for Operational Modal Analysis", Chauhan S., Martell, R., Allemang, R.J., Brown, D.L., Proceedings, International Modal Analysis Conference, 12 pp., 2007.
• "Structural Dynamics Education at the University of Cincinnati", Allemang, R.J., Proceedings, International Modal Analysis Conference, 18 pp., 2007.
• "The Modern Era of Experimental Modal Analysis: One Historical Prespective", Brown,
  D.L., Allemang, R.J., Sound and Vibration Magazine , Vol. 40, No. 1, 10 pp., Januar y,
  2007.
• "A Complete Review of the Complex Mode Indicator Function (CMIF) with Applications",
  Allemang, R.J., Brown, D.L., Proceedings, International Conference on Noise and Vibration
  Engineering, Katholieke Universiteit Leuven, Belgium, 38 pp., 2006.
• "Considerations in the Application of Spatial Domain Algorithms to Operational Modal Analysis", Chauhan S., Martell, R., Brown, D.L., Allemang, R.J.,Proceedings, International Conference on Noise and Vibration Engineering, Katholieke Universiteit Leuven, Belgium,
  16 pp., 2006.
• "A Low Order Frequency Domain Algorithm for Operational Modal Analysis",Chauhan S.,Martell, R., Brown, D.L., Allemang, R.J. , Proceedings, International Conference on Noise and Vibration Engineering, Katholieke Universiteit Leuven, Belgium, 14 pp., 2006.
• "Initial evaluation of a Novel Active/Passive Structural Neural System for Health Monitoring
  of Composite Materials", G.R.Kirikera, J.W.Lee, M.J.Schulz, A.Ghoshal, M.J. Sundaresan,
  R.Allemang, V.Shanov, B.Westheider, Journal of Smart Materials and Structures, Vol. ?, No. ?, xx pp., 2006 (Accepted for Publication).
• "Damage Localisation in Composite and Metallic Structures Using a Structural Neural System and Simulated Acoustic Emissions", Kirikera, G.R., Shinde, V., Schulz, M.J., Ghoshal, A., Sundaresan, M. and Allemang, R.J., Mechanical Systems and Signal Processing, Vol. ?, No. ?, xx pp., 2006 (Accepted for Publication).
• "Identification of Nonlinear Parameters for Reduced Order Models", Spottswood, S.M.,
  Allemang, R.J., Journal of Sound and Vibration, Vol. 295, pp. 226-245., 2006.
• "Identifying Nonlinear Parameters for Reduced Order Models", Spottswood, S.M., Allemang, R.J., Proceedings of the Ninth International Conference on Recent Advances in Structural Dynamics, Southampton, UK, July 2006.
• "Identifying Nonlinear Parameters for Reduced Order Models. Part I: An Analytical Comparison", Spottswood, S.M., Allemang, R.J., Proceedings, International Modal Analysis Conference, 11 pp., 2006.
• "Identifying Nonlinear Parameters for Reduced Order Models. Part II, Validation using Experimental Data", Spottswood, S.M., Allemang, R.J., Proceedings, International Modal Analysis Conference, 11 pp., 2006.
• "New Concepts GVT", Pickrel, C.R., Foss, G.C.,Phillips, A.W., Allemang, R.J., Brown, D.L.,
  Proceedings, International Modal Analysis Conference, 11 pp., 2006.
• "Extension of Traditional Modal Analysis Algorithms to Ambient Testing Using UMPA",
  Chauhan, S., Martell, R., Brown, D.L., Allemang, R.J., Proceedings, International Modal Analysis Conference, 11 pp., 2006.
• "A First Order, Extended State Vector Expansion Approach to Experimental Modal Parameter Estimation", Brown, D.L., Phillips, A.W., Allemang, R.J., Proceedings, International Modal Analysis Conference, 11 pp., 2005.
• "Data Presentation Schemes for Selection and Identification of Modal Parameters",
  Phillips, A.W., Allemang, R.J., Proceedings, International Modal Analysis Conference, 10
  pp., 2005.
• "The Unified Matrix Polynomial Approach to Understanding Modal Parameter Estimation:
  An Update", Allemang, R.J., Phillips, A.W., Proceedings, International Conference on
  Noise and Vibration Engineering, Katholieke Universiteit Leuven, Belgium, 36 pp., 2004.
• "Observations Concerning Modern Modal Parameter Estimation", Brown, D.L., Allemang,
  R.J., Proceedings, International Conference on Noise and Vibration Engineering,
  Katholieke Universiteit Leuven, Belgium, 16 pp., 2004.
• "A Low Order Implementation of the Polyreference Least Squares Complex Frequency
  (LSCF) Algorithm", Phillips, A.W., Allemang, R.J., Proceedings, International Conference
  on Noise and Vibration Engineering, Katholieke Universiteit Leuven, Belgium, 28 pp.,
  2004.
• "The Impact of Measurement Condensation and Modal Par ticipation Vector Normalization
  on the Estimation of Modal Vectors and Scaling", Allemang, R.J., Phillips, A.W., Proceedings, International Modal Analysis Conference, 12 pp., 2004.
• "A Magnetorheological Semi-active Isolator to Reduce Noise and Vibration Transmissibility
  in Automobiles", Stelzer, G.J., Schultz, M.J., Kim, J., Allemang, R.J., Journal of Intelligent Material Systems and Structures, Vol. 14, No. 12, pp. 743-765, 2003.
• "Application of a Generalized Residual Model to Frequency Domain Modal Parameter Estimation", Fladung, W.A., Phillips, A.W., Allemang, R.J., India-US 2001 Symposium, Emerging Trends in Vibration and Noise Engineering, 15 pp., 2001. Journal of Sound and Vibration, Vol. 262, No. 3, pp. 677-705, 2003.
• "An Overview of MIMO-FRF Excitation/Averaging/Processing Techniques", Phillips, A.W.,
  Allemang, R.J., India-US 2001 Symposium, Emerging Trends in Vibration and Noise Engineering, 17 pp., 2001. Journal of Sound and Vibration, Vol. 262, No. 3, pp. 651-675, 2003.
• "The Modal Assurance Criterion (MAC): Twenty Years of Use and Abuse", Allemang, R.J.,
  Proceedings, Inter national Modal Analysis Conference, pp. 397-405, 2002. Sound and
  Vibration Magazine, Vol. 37, No. 8, pp. 14-23, August, 2003.
• "Chapter 21: Experimental Modal Analysis", Shock and Vibration Handbook, Fifth Edition, Harris, C.M., Crede, C.E. , Piersol, A.G. (Editors), Allemang, R.J., Brown, D.L., Mc-Graw-Hill Book Company, 2002.
• "Acoustic Intensity Measurement of Road Simulator Hydraulic Actuator", Frenz, E.R., Allemang, R.J., Dumbacher, S. Proceedings, International Modal Analysis Conference, 7 pp., 2001.
• "Some Insights into the Mixed Modes of Rotors", Dias, M. , Allemang, R.J., Proceedings,
  International Modal Analysis Conference, 7 pp., 2001.
• "Discrete Frequency Models: A New Approach to Temporal Analysis", Adams, D. E. and
  Allemang, R. J., ASME Journal of Vibration and Acoustics, Vol. 123, pp. 98-103, 2001.
• "Subtleties in Nonlinear Structural Dynamic System Identification", Adams, D.E., Allemang, R.J., Proceedings, Eighth Conference on Nonlinear Vibrations, Stability and Dynamics of Structures, Blacksburg, Virginia, 12 pp., 2000.
• "Spatial Truncation in Models of Nonlinear Structural Dynamics Systems", Adams, D.E.,
  Allemang, R.J., Phillips, A.W., Wynn, R.H., Journal of Sound and Vibration, Vol. 237,
  No. 1 pp.145-161, October 2000.
• "Residual Frequency Autocorrelation as an Indicator of Nonlinearity", Adams, D.E., Allemang,
  R.J., International Journal of Non-Linear Mechanics, 16 pp., 2000.
• "Polynomial, Non-Polynomial and Orthogonal Polynomial Generating Functions for Nonlinear
  System Identification", Adams, D.E., Allemang, R., Proceedings, International Conference
  on Noise and Vibration Engineering, Katholieke Universiteit Leuven, Belgium, pp.
  665-670, 2000.
• "Noise Source Evaluation Testing on MTS Series 320 Road Simulator", Frenz, E., Dumbacher,
  S., Allemang, R., Mergeay, M., Proceedings, International Conference on Noise and
  Vibration Engineering, Katholieke Universiteit Leuven, Belgium, 7 pp., 2000.
• "A New Detection Method for Structural Non-Linearities", Roscher, T., Allemang, R.,
  Phillips, A.W., Proceedings, International Conference on Noise and Vibration Engineering,
  Katholieke Universiteit Leuven, Belgium, 8 pp., 2000.
• "A Frequency Domain Method for Estimating the Parameters of a Nonlinear Structural Dynamic
  Model through Feedback", Adams, D.E., Allemang, R.J., Mechanical Systems and
  Signal Processing, Vol. 14, No. 4, pp. 637-656, 2000.
• "Introduction of a General User Excitation Source Signal for Modal Testing", Fladung,
  W.A., Phillips, A.W., Allemang, R.J., Proceedings, International Modal Analysis Conference,
  7 pp., 2000.
• "Evaluation of Tire-Ground Boundary Conditions and the Effects on FRF Measurements",
  Frenz, E.R., Allemang, R.J., Proceedings, International Modal Analysis Conference, 5 pp.,
  2000.
• "A Superposition Principle for Nonlinear Systems", Adams, D.E., Allemang, R.J., Proceedings,
  International Modal Analysis Conference, pp. 702-710, 2000.
• "New Spatial MDOF Character ization and Identification Techniques for Nonlinear Systems",
  Adams, D.E., Allemang, R.J., Proceedings, International Modal Analysis Conference,
  pp. 725-732, 2000.
• "A New Derivation of the Frequency Response Function Matrix for Vibrating Nonlinear
  Systems", Adams, D.E., Allemang, R.J., Journal of Sound and Vibration, Volume 227,
  Number 5, pp. 1083-1108, 1999.
• "Characterization of Nonlinear Vibrating Systems Using Internal Feedback and Frequency
  Response Modulation", Adams, D.E., Allemang, R.J., ASME Journal of Vibration and
  Acoustics, Volume 121, Number 4, pp. 495-500, 1999.
• "Demonstration of Multiple Degree of Freedom Nonlinear System Identification Using Time
  and Frequency Domain Methods", Adams, D.E., Allemang, R.J., Proceedings, International
  Modal Analysis Conference, pp. 315-322, 1999.
• "Application of Differencing to Frequency Domain Parameter Estimation Algorithms",
  Dahling, T.M., Allemang, R.J., Phillips, A.W., Proceedings, International Modal Analysis
  Conference, 8 pp., 1999.
• "Using Cyclic Averaging with Impact Testing", Fladung, W.A., Zucker, A.T., Phillips, A.W., Allemang, R.J., Proceedings, International Modal Analysis Conference, 7 pp., 1999.
• "Frequency Resolution Effects on FRF Estimation: Cyclic Averaging vs. Large Block Size",
  Phillips, A.W., Zucker, A.T., Allemang, R.J., Proceedings, International Modal Analysis Conference, 4 pp., 1999.
• "A Spatial Method of Character izing Nonlinearities in Multiple Degree of Freedom Vibrating
  Systems", Adams, D.E., Allemang, R.J., Proceedings, International Modal Analysis
  Conference, pp. 1195-1202, 1999.
• "A Comparison of MIMO-FRF Excitation/Averaging Techniques on Heavily and Lightly
  Damped Structures", Phillips, A.W., Zucker, A.T., Allemang, R.J., Proceedings, International
  Modal Analysis Conference, 10 pp., 1999.
• "Survey of Nonlinear Detection and Identification Techniques for Experimental Vibrations",
  Adams, D.E., Allemang, R.J., Proceedings, Inter national Conference on Noise and Vibration
  Engineering, Vol. 1, Katholieke Universiteit Leuven, Belgium, pp. 269-281, 1998.
• "The Enhanced Frequency Response Function (eFRF): Scaling and Other Issues",
  Phillips, A.W., Allemang, R.J., Proceedings, International Conference on Noise and Vibration
  Engineering, Volume 1, Katholieke Universiteit Leuven, Belgium, 8 pp., 1998.
• "An Overview of MIMO-FRF Excitation/Averaging Techniques", Phillips, A.W., Allemang,
  R.J., Zucker, A.T., Proceedings, International Conference on Noise and Vibration Engineer
  ing, Volume 1, Katholieke Universiteit Leuven, Belgium, 12 pp., 1998.
• "A Unified Matrix Polynomial Approach to Modal Identification", Allemang, R.J., Brown,
  D.L., Journal of Sound and Vibration, Volume 211, Number 3, pp. 301-322, April 1998.
• "Estimating Modal Parameters from Different Solution Sets", Phillips, A.W., Allemang, R.J.,
  Pickrel, C.R., Proceedings, International Modal Analysis Conference, 10 pp., 1998.
• "A new Excitation Method: Combining Burst Random Excitation with Cyclic Averaging",
  Phillips, A.W., Allemang, R.J., Proceedings, International Modal Analysis Conference, 10
  pp., 1998.
• "The Complex Mode Indicator Function (CMIF) as a Parameter Estimation Method",
  Phillips, A.W., Allemang, R.J., Proceedings, International Modal Analysis Conference, 10
  pp., 1998.

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