Expert Details

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

Expert 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 University of Arizona. 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 University of Arizona 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

Expert may consult nationally and internationally, and is also local to the following cities: Phoenix, Arizona - Tucson, Arizona - Mesa, Arizona - Glendale, Arizona - Scottsdale, Arizona - Chandler, Arizona - Tempe, Arizona - Gilbert, Arizona - Peoria, Arizona

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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 Responsibilities
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: 2003 to 2004 Employer: NASA/JPL Title: Undisclosed Department: Mechanical Systems Responsibilities: Designed deployable structure concepts for large antennae (two summers only)
Years: 2000 to 2000 Employer: TNO (Netherlands) Title: Undisclosed Department: MADYMO Responsibilities: Improved and corrected commercial code used for crashworthiness analysis (one sabbatical year)

Government Experience

Years Agency Role Description
Years: 1976 to 1979 Agency: Foreign Broadcast Information Service Role: Monitor Description: Monitored, selected, translated news and commentary from broadcast and print media in Turkish and Armenian
Years: 1980 to Present Agency: Open Source Center Role: Translator/selector Description: Selects and translates news and commentary from Internet and print media in Turkish and Armenian
Years: 1987 to 1987 Agency: National Science Foundation Role: Panel member Description: Reviewed and selected proposals for funding
Years: 1999 to 1999 Agency: National Science Foundation Role: Panel member Description: Reviewed and selected proposals for funding

International Experience

Years Country / Region Summary
Years: 2000 to 2000 Country / Region: Netherlands Summary: Improved and corrected a commercial code (MADYMO) used by the automotive industry for crashworthiness analysis;
Years: 1993 to 1993 Country / Region: Armenia Summary: Developed courses and research programs for scientists in newly independent Soviet republic
Years: 1996 to 1999 Country / Region: Armenia Summary: Secured funding for civilian use of military technology used in former USSR; collaborated with scientists in charge of program funded by US government agency
Years: 1996 to 1999 Country / Region: Turkey Summary: Secured funding from NATO for joint project with a Turkish university; worked and published on dynamics of rotating deformable bodies.
Years: 1999 to 1999 Country / Region: Denmark Summary: Taught short course on advanced computational methods in multibody dynamics at Technical Univ of Denmark.

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;
Professional Appointments
Reviewer for the ASME Journal of Applied Mechanics, ASME Journal of Engineering for Industry, ASME Journal of Biomechanical Engineering, Dynamics and Control, Multibody System Dynamics;
Reviewer for the American Control Conference
Reviewer for proposals to the National Science Foundation;
Reviewer for proposals to the Army Research Office;
CAD/CAM book reviewer for HarperCollins Publishers, John Wiley and Sons, West Publishing Company, PWS Publishing Company;
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.

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.
Other Relevant Experience
Provides consulting services to local small and large companies on requests involving electronic packaging, shock and dynamic analysis and testing, finite element analysis for structural integrity, concept development for advanced and novel articulating mechanical systems, biomechanical analysis.

Language Skills

Language Proficiency
Turkish Professional translator Turkish <-> English
Armenian Professional translator Armenian <-> English

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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