Expert Details

Vibration Analysis, Mechanical Failure Analysis, Accident Reconstruction, Injury Biomechanics

ID: 724861 Arizona, USA

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Expert has extensive experience with the modeling and analysis of complex mechanical systems that incorporate articulated joints and that involve large and high rates of rotation. He has used angular momentum concepts to analyze the motion of falling cats as well as momentum wheels in space applications.

Expert has applied his expertise in dynamics, mechanics of solids, and biomechanics to accident reconstruction and injury analysis and prediction in low-speed vehicle collisions. He has written detailed analysis reports for a variety of plaintiff and defendant side clients including various law firms, the City of Tucson, and a major national insurance company.

Expert has extensive experience and expertise in the use of the ANSYS simulation software. He has regularly taught a course in finite element methods using ANSYS at the Employer. He has used ANSYS in a variety of industrial consulting projects for structural and dynamics analysis. Most of his work has focused on models based on linear materials, linear strains. He has also used ANSYS extensively for modal, harmonic, and transient analysis of vibration problems. Recently he used ANSYS for the thermal analysis of an electronics package for an upstart company.

Expert's work in the analysis of simple structures may involve the use of Castigliano's theorem and virtual work concepts.

Expert's work in the analysis of structures often involves checks using simplified models or equivalent systems, which may involve calculations of basic quantities such as bending moments, linear and angular momenta and mechanical energy. The methods used in such basic model analyses involve Newtonian mechanics, classical dynamics, dynamic force analysis, kinematics, kinetics, rigid-body dynamics, strain and stress analysis, stress modeling, scalar, vector, and complex analysis, and virtual work concepts.

Expert has a strong background in vibration analysis and modeling and has taught various courses on the subject at the Employer for many years. His expertise spans single and multi-degree-of-freedom systems, discrete and continuous systems, finite-element methods, modal and harmonic analysis, and three-dimensional structures. He has performed consulting work on these topics for various local and national companies. He uses the Matlab and ANSYS packages extensively for these analyses.

Expert has extensive experience and advanced expertise in the use of the Matlab mathematical software package. He has used the package for various complex numerical analyses projects as well as for the derivation of equations of motion using the Symbolic Toolbox of the package. He has also used the Optimization Toolbox of the package extensively in various mathematical models of complex multivariable systems. Expert can also use the Simulink and SimMechanics toolboxes of the package for friendly graphical-user interfaces and easy-to-understand models.

Provided analyses and arguments in numerous cases involving whiplash and back injuries in low-speed vehicle collisions to law firms and Allstate Insurance.Provided detailed finite-element analyses for failure of a dental chair, a portable massage table, and similar products to local law firms.Provided finite-element and dynamic analyses for load rating structures used by a Tucson subsidiary of Caterpillar corporation; redesigned structures for lower cost manufacturing while maintaining load ratings; designed tests to verify analysesGenerated various concepts for classified new types of missiles for Raytheon Corporation.Identified source of vibration problem for a high-precision medical device manufactured by a local company; provided a solution for fixing the problem

Education

Year Degree Subject Institution
Year: 1986 Degree: PhD Subject: Mechanical Engineering Institution: Univ of Southern California
Year: 1982 Degree: MS Subject: Mechanical Engineering Institution: Univ of Southern California
Year: 1980 Degree: BS Subject: Mechanical Engineering Institution: Texas A & M University

Work History

Years Employer Title Department
Years: 1986 to Present Employer: Undisclosed Title: Undisclosed Department: Aerospace and Mechanical Engineering
Responsibilities:
Manages undergraduate affairs, coordinates teaching and services in 25-faculty, 15-staff, 650-student department; teaches senior and grad courses; conducts research and consulting
Years Employer Title Department
Years: 2003 to 2004 Employer: NASA/JPL Title: Undisclosed Department: Mechanical Systems
Responsibilities:
Designed deployable structure concepts for large antennae (two summers only)
Years Employer Title Department
Years: 2000 to 2000 Employer: TNO (Netherlands) Title: Undisclosed Department: MADYMO
Responsibilities:
Improved and corrected commercial code used for crashworthiness analysis (one sabbatical year)

Additional Experience

Expert Witness Experience
Provides consulting services to various lawyers in Tucson on cases involving low-speed vehicle crashes, failure of various mechanical structures, patent infringements, playground safety, etc.

Career Accomplishments

Associations / Societies
Member, Advisory Board, Multibody System Dynamics;
Member, Postdoctoral Research Associate Program Panel of the Computational and Information Science and Engineering Division, National Science Foundation;
Secretary and Treasurer, Advisory Board of the Arizona Movement Balance Laboratory, the NovaCare Corporation, Tucson, Arizona;
Associate Director, Engineering Research Center, American University of Armenia, Yerevan, Armenia;
Member, Local Organizing Committee, Eleventh U.S. National Congress of Applied Mechanics;
Session chairman, “Rigid Body Dynamics and Lumped Parameter Systems,” Eleventh U.S. National Congress of Applied Mechanics;
Member, Research Initiation Panel of the Dynamics and Control Systems program, National Science Foundation;
Awards / Recognition
Presidential Young Investigator Award.
Boeing A. D. Welliver Faculty Fellowship.
Biographee in Marquis Who’s Who in Science and Engineering.
Biographee in Dictionary of International Biography.
Publications and Patents Summary
He has over 15 publications in the field and many conference and lecture presentations.

Fields of Expertise

angular momentum, linear momentum, mechanical system, rigid-body dynamics, spatial translation, dynamic force analysis, mechanical failure, injury reconstruction, crash analysis, accident reconstruction, ANSYS software, finite element analysis software, mechanical system dynamic response simulation, stress modeling, structural analysis, mechanical stress, finite element analysis, Castigliano's theorem, virtual work, bending moment, classical dynamics, equivalent system, Newtonian mechanics, scalar quantity, static balance, strain analysis, stress analysis, vector quantity, elastic modulus, vibration modal analysis, vibration modeling, elastic vibration, harmonic analysis, degree of freedom, Matlab, mathematical modeling, mechanical system computer-based simulation, numerical modeling, three-dimensional model, numerical analysis, cervical whiplash, system modeling, low speed accident, load combination, sine sweep vibration analysis, dynamic load (structural system), load (force), vibration telemetry, vibrometer, mathematical optimization model, applied mechanics, mechanical property testing laboratory, calculator, mathematical analysis, finite element method, finite element model correlation, rotor dynamics, solid modeling, shear strength, elastic limit, spine injury, iterative method, number system, finite element modeling, parallel scientific computation, transmissibility, data visualization system, vibration control, vibration measurement, dynamic modeling, Fourier analysis, stress concentration, continuum mechanics, structural dynamics, machine-element stress analysis, application software, mathematics software, equation, computational physics, dynamic balance, crashworthiness, operations research, artificial limb stress analysis, deformation, computer simulation, simulation, computer spreadsheet, coordinate set, finite element analysis training, mathematical relation, accident, model, force, mechanical property, elastic property, mathematical theorem, mathematical function, machine vibration analysis, vibration, truss, structural mechanics, statics, physics modeling, physical system modeling, numerical optimization, number crunching, modeling, mechanics, mathematics, mathematical model, kinetics, kinematics, harmonic motion, graphics software, geometric modeling, dynamics, data analysis, curve fitting, biomechanics, accident investigation

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