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Significant Contributions

The following list represents the contributions by the UC-SDRL to the area of structural dynamics:

1963 Use of swept sine frequency response analysis equipment in the study of machine tool structures
1965-68 Air Force machine tool studies
1967 First modal parameter estimation algorithm for generating modal information from frequency response functions, assuming a proportional damping model
1969 Digital Fourier analysis used to measure frequency response functions through impulse excitation
1970 Modal parameter estimation algorithm for non-proportional damping model
1971 Acoustic signature analysis of castings
1972 Animation of modal vectors
1973 Development of color display subsystem for data presentation: Waterfall diagram, voice print, sound pressure level mapping, color animated mode shape movies (color gradation used as third dimension)
1974 Development of the complex exponential algorithm for real time modal parameter estimation from frequency response functions
1975 Modal analysis software including data management and interactive analysis
1975 Modal parameter estimation algorithm for multiple frequency response functions (Least Squares Complex Exponential Algorithm)
1975 Experimental modal analysis review (literature and interviews)
1980 Development of Modal Assurance Criterion for correlation of independent modal vector estimates (Little MAC and Big MAC)
1980 Development of dual input, random excitation frequency response function estimation
1981 Development of experimental modal analysis technique based upon an intermediate estimate of mass, stiffness, and damping matrices
1983 Development of multiple channel random noise source hardware
1983 Development of multiple channel signal conditioning hardware (auto-ranging amplifier/filter)
1985 Development of Multi-Mac modal parameter estimation algorithm
1985 Development of Polyreference Frequency Domain (PFD) modal parameter estimation algorithm
1986 Development of Multiple Reference Ibrahim Time Domain (MRITD) modal parameter estimation algorithm
1987 Development of new spatial domain modal parameter estimation algorithm, Complex Mode Indicator Function (CMIF) method
1988 Development of Unix Modal Program.
1990 Development of spatial sine testing hardware, software and parameter estimation algorithms.
1990 Calculation of modal filters from experimentally measured data.
1991 Development of the "U-Vector" impedance modeling method.
1991 Development of the Pertubated Boundary Condition (PBC) test method.
1992 Development of the Unified Matrix Polynomial (UMPA) Approach to a common formulation of modal parameter estimation methods.
1993 Development and implementation of Modal Filter Based active vibration control methods for complex structures.
1994 Development of the "X-Modal" Matlab based, graphical user interface (GUI) modal parameter estimation software for the HP-UX operating system.
1997 Development of the Matlab interface to "Plug N Play" drivers for HP/Agilent 143x VXI hardware.
1997 Development of Kalman filter computed order tracking software.
1997 Development of Matlab based Nearfield Acoustic Holography (NAH) software.
1998 Development of the "X-ACQuisition" Matlab based data acqusition software for HP/Agilent 143x VXI hardware.
1999 Development of the "X-Modal II" Matlab based, graphical user interface (GUI) modal parameter estimation software for PC and UNIX operating systems.
2000 Development of Non-Linear Polynomial Modeling of Multiple Input, Multiple Output (MIMO) Experimental Data
2002 Developed 6 DOF Load Cell and Calibration Methods for 6 DOF Loads (Rigid Body Assumption)
2004 Developed Experimental Inertia Estimation Method Based upon 6 DOF Interface Loads and Externally Applied Forces and Associated Accelerations (Rigid Body Assumption)
2006 Developed Identification Methods for Reduced Order Non-Linear Models from Experimental MIMO Data
2007 Developed MIMO Transmissability and MIMO Group Transmissability for Evaluating Structural Integrity
2008 Integrated Operational Modal Analysis into the Unified Matrix Polynomial Approach (UMPA) Framework