Modern Era of Experimental Modal Analysis: One Historical Perspective, The
Dr. Brown (right) graduated from the University of Cincinnati, Aeronautical Engineering Program with a B.S. degree in 1961. After graduation, as part of a university research contract, he worked at Wright Piittorson Air Force Base in the ARL Hypersonic: Wind Tunnel Facility where he was involved with both analytical and experimental hypersonic: research. After he received his M.S. degree in 1963, Dave took a temporary leave of absence from the University for two years and worked on the Research Staff at General Electric in Cincinnati, studying hypersonic: shockwave boundary layer interactions in hypersonic scramjet inlets as part of another Air Force Project. During his stay at GE, Dave took a self study class in advanced thermo-dynamics from the department head of the Mechanical Engineering Department and when ho returned to the University of Cincinnati, he joined the University of Cincinnati Structural Dynamics Research Laboratory (UC-SDRI,) in the Mechanical Engineering Department. This was the start of his long association with the UC-SDRL. His early work in UC-SDRL was studying cutting mechanics of the grinding process which evolved into "Grinding Dynamics" which became the main title of his Ph.D. dissertation work. During bis study of grinding dynamics, Dave became very involved in the early practical development of Fourier analysis as applied to digital signal processing, acoustics, controls, self-excited and forced vibrations. This work set the stage for subsequent developments in experimental structural dynamics, the area that is often associated with UC-SDRL. During this early period from 1966-1970. Dr. Brown worked on the Research Staff and taught undergraduate and graduate courses in thermodynamics, acoustics and vibrations. In 1970, Dr. Brown became the Director of the UC-SDRl, a position he held until he retired in the fall of 2004. During his tenure, Dave influenced and advised hundreds of students, gave many seminars, consulted with a large number of companies, was published extensively in the above mentioned areas and was invited to give numerous keynote presentations at conferences internationally. Dr. Brown is still teaching an occasional course and he continues to direct research in the areas of acoustics, controls and vibration. His students are his proudest legacy.
Dr. Allemang (left) 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 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 authored or coauthored over 140 torhnical 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), Bulgium, Germany and France, including being asked to give the keynote address at both the Lenven International Seminar on Modal Analysis (ISMA, 1990) and the International Modal Analysis Conference (IMAC. 1993). During this period. Dr. Allemang has served as principal investigator or coprincipal investigator in over $2,500,000 of research with government (NASA and USAF) and commercial agencies (Boeing. General Motors, Ford. HP/Agilent, MTS, Brüel & Kjær, etc.). Dr. Allemang has worked as a consultant to a number of companies in many different structural dynamics applications since 1973. He continues to serve on the Advisory Board for the International Modal Analysis Conference (Chairman, 1086-1995), 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 is currently involved in several areas of research which includes the experimental identification of nonlinear structural systems, the development of flexihle 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. He 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.