Dr Mohamed Laoucet Ayari .pdf



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MOHAMED LAOUCET AYARI, PH.D.
Address: 2820 Cordry Ct, Boulder, CO 80303 Colorado USA

Employment and Experience
1995-Present: Ball Aerospace & Technologies Corporation, Boulder, CO
Current Title: Staff Consultant
Other Affiliations: Adjunct Professor, University of Colorado at Boulder
Contribution to Programs:
Solar Array and Antenna Mechanisms, Lockheed-Martin, 95-98, Lead Structural Engineer
BAPTA Drive, WINDSAT, Naval Research Laboratory, 98-99, Lead Structural Engineer
Chandra X-ray Observatory, Thermal Control FRB, 98, Lead Structural Engineer
LaserCom, Design of Fast Steering Mirror Flexural system, 98, Lead Structural Engineer
NPOESS, CMIS Instrument, 99, Lead structural engineer
Hubble Space Telescope, Wide Field Camera 3, Lead Structural Engineer
Mars Exploration Rovers, High-Gain Antenna 01-03, Lead Structural Engineer
Deep Impact, HRI Telescope, FRB -Primary Mirror, 02, Lead Structural Engineer
Solar Array and Antenna Mechanisms, Lockheed-Martin, 02-03, Technical Manager
Jitter Isolation Mounts for Momentum Wheel disturbances IR&D, 02-03, Principal Investigator
&Technical Manager
Fast Steering Mirrors, AUSM Program, 03-07 Responsible Structural Engineer
Space Shuttle Solid-state Star Tracker, 05, FRB, Structural Engineer
Star Tracker S/N 003, SBIRS, FRB, 2006, Structural Engineer
35K Cryocooler BATC IR&D, Jitter Isolation Mounts, 2007, Consultant
WorlView, RAC Drive, Bearing/Gear train design, 2007, Consultant

1988-1995: University of Manitoba, Winnipeg, Canada
Final title: Associate Professor, Dept. of Mechanical & Industrial Engineering, (Tenure
awarded in 1994).

Job Related Skills





Mechanisms: Hinges, Solar Array and other Precision Drives, Flexures & Latches
Computational Mechanics: Finite Element Analysis & Boundary Element Method,
Bearing Analysis & Design, Jitter Isolation and Structural Optimization
Optics: Mounting of Optical Systems, Stability & Distortion Analysis
1





Materials: Constitutive Modeling and Fracture Mechanics of Brittle Materials
Testing: Dynamics, Hybrid Testing & measurements
Controls: Spacecrafts & Instruments e.g. Fast steering mirrors

Education and Training

Ph.D. University of Colorado, Boulder, Colorado, 1988.
Ingenieur Diplome, Civil Engineering, Ecole Nationale d'Ingénieurs de Tunis, 1983

Other Skills and Interests
Computer Skills:





Programming experience: MAPLE, MATLAB, Fortran90, C/C++, Visual Basic, HTML, TeX, LaTex and
PostScript
Familiar with the following software: NASTRAN, IDEAS, BEAR3D, and Microsoft Office Products
Computer Graphics: IDL and OpenGL
Worked with several categories of computers during the past two decades:
Supercomputers (CYBER 205), Mini-Supercomputer (ALLIANT FX/2800 series),
Mainframes (DEC, CYBER, AMDAHL), Minis (VAX), Workstations (APOLLO, SUN, IBM),
PC (386, 486 and Pentium architectures).

Languages:
English, French and Arabic (all spoken/read/written)

Hobbies:
Astronomy, Soccer and Running

Professional Activities
Committee Service:



Member of the BATC Structural Engineering Nastran Group Panel Discussion, 2004-2005
Member of the BATC Controls/Structures Development Working Group, 2005



ISO9000 Implementation Committee, Structural & Thermal Engineering Department, Ball
Aerospace & Technologies Corp., 1998-1999.



“Industry Representative,” The Boundary Integral Analysis Consortium, NIST, Department of
Energy, 1998-2003



Intranet Web-custodian and technical Implementation, Structural & Thermal
Engineering Department, Ball Aerospace & Technologies Corp., 1998-1999.



Member of the “Computer Use” committee, Faculty of Engineering,
University of Manitoba. 1991 - 1993.
2



Member of the “Engineering Promotions Committee,” Faculty of Engineering, University of
Manitoba. Sept. 1992 - Present.



Member of the “Curriculum Committee,” Faculty of Engineering, University of Manitoba. Sept.
1993 - Present.



Chairman, “Research and Graduate Studies Committee”, Dept. of Mech. Engnr., University of
Manitoba. Sept. 1991 - June 1993



Department Representation for the Graduate Recruitment Fair 1993 and 1994.

Membership held in Professional Societies:







AAM; Member of The American Academy of Mechanics
CSME; Member of The Canadian Society for Mechanical Engineering
ASME; Associate Member of The American Society of Mechanical Engineers
ASCE; Associate Member of The American Society of Civil Engineers
APEM; Member of the Association of Professional Engineers of the Province of Manitoba
USACM; Member of the United States Association for Computational Mechanics

Reviews and Workshop Organization:











Referee, ASCE Journal of Applied Mechanics
Referee, Journal of Engineering Mechanics
Referee, International Journal of Solids and Structures
Referee for the Canadian Journal of Geotechnical Engineering
Referee, Grant Selection Committee of the Natural Sciences and Engineering Research Council of
Canada
Referee, Paper Review Board of the 13 th Canadian Congress of Applied Mechanics
External Examiner for the Association of Professional Engineers of the Province of Manitoba
External Examiner for the Department of Mechanical Engineering, University of Central
Queensland, Australia
Member of the Organizing Committee of the “Workshop on Matrix Computation and
Applications,” Institute of Industrial Mathematical Sciences, Canada.
Member of the Organizing Committee of the ACRES Workshop on Safety Assessment of
Concrete Dams, Ontario, Dec. 1989.

Invited Seminars and Lectures
“Engineering Design -- Overview and Industrial Applications,” Society of Manufacturing






Engineers, Winnipeg, Manitoba, Nov. 29, 1994.
“Engineering Design & Creation,” St. John's College, University of Manitoba, Nov. 9, 93
“Modelization de l’Endomagement des Structures Massives,” Departement de Genie Civil,
Universite de Sherbrook, Dec. 7, 1992.
“Progressive Damage of Solids and Structures,” Department of Civil Engineering, Concordia
University, Dec. 10, 1992.
“Matrix Computations in Engineering Mechanics,” Workshop On Matrix Computation and
Applications, Institute of Industrial Mathematical
Sciences, Winnipeg, Canada, Dec. 9-10, 1991.
“Application de la mecanique des fractures aux problemes de barrages en beton, “Departement de
Genie Civil, Ecole Polytechnique, Montreal, Jan. 15, 1991.
3

“Fracture Mechanics Based Seismic Analysis of Concrete Dams,” ACRES Workshop on Safety
Assessment of Concrete Dams, Niagara Falls, Ontario, Dec. 7 and 8, 1989.
“Fracture of Rocks and the Science of Fracture Mechanics,” ACRES Workshop on Safety
Assessment of Concrete Dams, Niagara Falls, Ontario, Dec. 7 and 8, 1989.

Courses Taught









Undergraduate Courses:
25.480 Computer Aided Engineering Design
25.222 Stress Analysis and Design II
25.350 Stress Analysis and Design III
26.226 Mechanics of Solids
Graduate Courses
25.785 Applied Finite Element Method
25.783 Computational Mechanics (Plasticity Theory)
23.761 Special Topics in Theoretical and Applied Mechanics
23.788 Continuum Mechanics

Student Training
Ball Interns, COOP & Junior Engineers







Brienne Bogenberger, Analysis of Solar Array Drives, 2003
Robyn Wing, Tactical Fast Steering Mirror analysis and Design, 2003
Timothy Katrina, Stiffness Testing of Solar Array Drives, 2003
Sarah Trester, Fast Steering Mirrors, Bearing Analysis, 2001-2003
Tom Torrance, Solar Array Drives and Mechanisms, 2003-2005
Adam Spinner, Fast Steering Mirrors, 2005

Undergraduate Summer Students
Mario Castillo, Dept. of Mechanical & Industrial Engineering, “Dynamic properties of Composite
Materials,” Summer 1994.

Paul Labossiere, Department of Mechanical & Industrial Engineering,
”Torsional Stiffness Storage Modules for Van-Conversion,” Summer 1994.
Lyons Russell, Department of Mechanical & Industrial Engineering, “Thermal behavior of
Stainless Steel and Aluminum Alloys,” Summer 1994.
John Gravelines, Department of Applied Mathematics
“Statistical Characterization of Potash Rock Grains,” Summer 1994.
Melody Ghahramani, Department of Applied Mathematics
“Time-integration Techniques for Finite Element Analysis,” Summer 1994.
Siu-ying Cheing, Dept. of Applied Mathematics
“Interactive Computer Graphics for Finite Element Computations,” Summer 1994.



4

Master of Science
Douglas Roberge, “Thermomechanical Behaviour of Gas Turbine Components”
Mechanical Engineering Department, University of Manitoba, 1997.
Eileen Zhu, ”Numerical Modeling of the Contact-Impact Problem in Randomly Cracked Solids,”
Mechanical Engineering Department, University of Manitoba, 1994.
Mitchel G. Decaire, “Finite Element Modeling of Time-dependent Failure of Nuclear Waste
Disposals”, Mechanical Engineering Department, University of Manitoba, 1993.
Terrance J. Armstrong, ”An Algorithm for Transient Finite Element Thermal Analysis of
Incrementally Constructed Mass Concrete Dams,” Civil Engineering Department, University of
Manitoba, 1993.
Nana Mulyana, ”Finite Element Modeling of the Time-dependent Potash Mining Process”, Civil
Engineering Department, University of Manitoba, 1992.

Ph.D.





Baoku Sun,“Damage induced by Cyclic Fatigue and Creep of Aluminium Alloys and Stainless
Steel”, Department of Mechanical Engineering, University of Manitoba, 1994.
Abdulhamid Irhouma, “Fracture of Massive Brittle Processes in Concrete Dams” , Department
of Civil Engineering, University of Manitoba, 1988.
Pixin Zhang, “Cracking and Failure of Hydroelectric Engineering Structures”, Department of
Mechanical Engineering, University of Manitoba, 1997.
Saleh Abdussalem, “Damage and Fracture of Composite Materials”, Department of
Mechanical & Industrial Engineering, University of Manitoba, 1998.

Postdoctoral fellows
o Nansheng Sun, “ Damage modeling of Granular Materials”, 1994-1995.
o Zhimming Ye, “Failure of Composite Materials”, 1995-1996.
Individual Grants, Contracts and Support Held
Reaction Cancellation in Tactical Fast Steering Mirrors,
IR & D, Ball Aerospace & Technologies Corp., Boulder, CO.
Duration: 1 years
Type: Research and Development Grant
Investigator: M.L. Ayari
Amount........................$ 43,500

Three-Dimensional Finite Element modeling of Bearing systems
IR & D, Ball Aerospace & Technologies Corp., Boulder, CO.
Duration: 5 Months
Type: Research and Development Grant
Investigator: M.L. Ayari
Amount........................$ 50,000

Jitter Isolation Mounts for Momentum Wheels
IR & D, Ball Aerospace & Technologies Corp., Boulder, CO.
Duration: 2 years
Type: Research and Development Grant
5

Investigator: M.L. Ayari
Amount........................$ 320,000





Cyclic Creep-Fracture of Aluminium Alloys and Stainless Steel
Natural Sciences and Engineering Research Council of Canada
Duration: 3 years
Type: Grant
Investigator: M.L. Ayari
Amount.........................$ 61,000
Creep Fracture of Stainless Steel and Aluminum Alloys
Natural Sciences and Engineering Research Council of Canada
Type: Operating GrantDuration: 5 years
Investigator: M.L. Ayari
Amount...........................$110,000

Repair of Cracked/Leaking Concrete Dams
Manitoba Hydro, Manitoba, Canada
Duration: 3 years
Type: Grant
Investigator: M.L. Ayari
Amount........................$ 181,000

Industrially Oriented Research -NSERC Matching Fund
Investigator: M.L. Ayari
Amount........................$ 151,000

Computer-aided design Graphics Support
University of Manitoba President's NSERC General Research
Grant-Mechanical & Industrial Engineering Department
Duration: N.A.
Type: Grant
Investigators: S.J. Ormiston, M.L. Ayari and R. W. Derksen
Amount........................$ 10,000

Mining Induced Fracture and Seismicity
Potash Corporation of Saskatchewan
Duration: 2 years
Type: Grant
Investigators: E.Z. Lajtai and M.L. Ayari
Amount.........................$ 19,100

Safety Assessment and Failure Characterization in
Underground Openings for Nuclear Waste Disposals
Atomic Energy of Canada, Whiteshell research Laboratories
Duration: 18 Months
Type: Grant
Investigator: M.L. Ayari
Amount........................$ 28,068

6

Awards and Honors
Outstanding Team Award, "Composites Class Team" Ball Aerospace and Technologies Corp.,






Mar., 1999.
Four consecutive 100 % SAAM Team Award Fee, Hybrid Vehicle Design, Article 5, and Risk
Adverse Spares hardware efforts, Lockheed-Martin, 1999.
Special Recognition for SAAM Team outstanding design, US Government, 1998.
Award Fee, Special recognition, SAAM Program, BASD-Lockheed-Martin, 1997.
Outstanding Technical Contribution, Analysis Dept. Systems Division, Ball Aerospace &
Technologies Corp., 1996.
Received several student scholarships and support, University of Colorado, Department of the
Army, Waterways Experiment Station and Tunisian Government

Publications
Ph.D. Dissertation Title:
“Static and Dynamic Fracture Mechanics of Concrete Gravity Dams,” University of Colorado,
Boulder, 1988
And more than 120 academics publication

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