. Journal papers:
Hassen M Ouakad, Mohammad I Younis "Dynamic response of slacked single-walled carbon nanotube resonators, " Nonlinear Dynamics, DOI: 10.1007/s11071-011-0078-3, 2011.
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Hassen M Ouakad, Mohammad I Younis "Natural frequencies and mode shapes of initially curved carbon nanotube resonators under electric excitation, " Journal of Sound and Vibration, Vol. 330, pp. 3182-3195, 2011.
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Mohammad I Younis, Hassen M Ouakad, Fadi M Alsaleem, Weili Cui, Ronald Miles " Nonlinear Dynamics of MEMS Arches Under Harmonic Electrostatic Actuation, " Journal of Microelectromechanical Systems, Vol 19(3), pp. 647-656, 2010.
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Hassen M Ouakad, Mohammad I Younis, “Nonlinear Dynamics of Carbon Nanotube Resonators,” ASME journal of computational and nonlinear dynamics, Vol 5(1), pp. 011009(1-13), 2010.
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Hassen M Ouakad, Mohammad I Younis, “The Dynamic Behavior of MEMS Arch Resonators Actuated Electrically,” International journal of nonlinear mechanics, Vol. 45, pp. 704–713, 2010.
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Hassen M Ouakad, Mohammad I Younis “Modeling and Simulations of Collapse Instabilities of Microbeams due to Capillary Forces”, Mathematical Problems in Engineering, Volume 2009, Article ID 871902, 16 pages doi:10.1155/2009/871902, 2009.
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Fadi M Alsaleem, Mohammad I Younis, Hassen M Ouakad, "On the Nonlinear Resonances and Dynamic Pull-in of Electrostatically Actuated Resonators" J. Micromech. Microeng. Vol. 19(4), pp. 045013(1-14), 2009.
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Ali H Nayfeh, Hassen M Ouakad, Fehmi Najar, Slim Choura, Eihab Abdel-Rahman, “Nonlinear Dynamics of a Resonant Gas Sensor,” Nonlinear dynamics, Vol. 59(4), pp. 607-618, 2009.
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. Conferences and workshops:
- Hassen Ouakad and Mohammad Younis, “Investigation into the Response of Slacked Carbon Nanotube Resonators to Electric Actuation”, Accepted for presentation in the International Conference on Advanced Research and Applications in Mechanical Engineering (ICARAME’11), Notre Dame University-Louaize, Lebanon, June 13-15, 2011.
- Hassen Ouakad and Mohammad Younis, “Internal Resonance in Electrically Actuated MEMS Arches”, Accepted for presentation in the 7th European Nonlinear Dynamics Conference (ENOC 2011), Rome, Italy, 24-29 July 2011.
- Hassen M. Ouakad and M. I. Younis, “Forced Vibrations of Slacked Carbon Nanotube Resonators,” In Proc. Of The ASME 2010 International Mechanical Engineering Congress & Exposition
(IMECE2010), Vancouver, British Columbia, Canada, November, 2010.
- Hassen M. Ouakad and M. I. Younis, “Natural Frequencies and Mode Shapes of Slacked Carbon Nanotube NEMS Resonators,” In Proc. Of The ASME 2010 International Design Engineering Technical Conferences (IDETC2010), Montreal, Quebec, Canada, August, 2010.
- Hassen M. Ouakad, F. Al Saleem, Mohammad I. Younis, Tim Levo, and James Pitarresi, “Response of an Electrostatically Actuated Microbeam to Drop-Table Test,” IEEE Thermal, Mechanical & Multiphysics Simulation and Experiments in Micro/Nano-Electronics and Microsystems Conference, IEEE EuroSimE 2010, Bordeaux, France, April, 25-28, 2010.
- Mohammad Younis, Hassen Ouakad, "The Static and Dynamic Behavior of MEMS Arches Under Electrostatic Actuation", Proceeding of the IEEE, 6th International Symposium on Mechatronics and its Applications (ISMA09), Sharjah, UAE, March 24-26, 2009
- Hassen Ouakad, Mohammad Younis, “Modeling and simulations of collapse instabilities of microbeams due to capillary forces”, accepted for publication and presentation at the ASME IMECE2008, Boston, MA, November 2008.
- Fadi M. Alsaleem, Mohammad I. Younis, Hassen M. Ouakad, “Experimental and Theoretical Investigation of the Nonlinear Dynamics of an electrostatically-actuated device”, accepted for publication and presentation at the ASME IMECE2008, Boston, MA, November 2008.
- Hassen Ouakad, Mohammad Younis, “Nonlinear Dynamics of Electrically-Actuated Carbon Nanotube Resonator”, accepted for publication and presentation at the ASME IMECE2008, Boston, MA, November 2008.
- Hassen Ouakad, Ali. H. Nayfeh, Slim Choura, Eihab. M. Abdel-Rahman, Fehmi Najar, Bashar Hamad, “Feedback control and nonlinear dynamics of microbeams resonator”, accepted for publication and presentation at the ASME IMECE2008, Boston, MA, November 2008.
- Hassen M. Ouakad, Haidar N. Arafat, Momahhad I. Younis, “The response of a cantilever microbeam with a plate attached to its tip to mechanical shock” accepted for publication and presentation at the ICCSSS IASS-IACM 2008, Cornell University, Ithaca, NY, May 2008.
- Hassen Ouakad, Mohammad Younis, “Modelling and simulation of a cantilever-paddle beam under the effect of capillary, shock, and electrostatic forces”, accepted for publication and presentation at the ASME IDETC2008, New-York City, NY, August 2008.
- Hassen M Ouakad, Ali H Nayfeh, Fehmi Najar, Slim Choura, Eihab Abdel-Rahman, “Dynamics of a resonant gas sensor,” accepted for publication and presentation at the ASME IMECE2008, Lake Buena Vista, FL, November 2009.
- Participation in the US-Tunisia Workshop : "Research and Educational Advances in Design and Fabrication of Microelectromechanical Systems", December 14-16, 2006 at Hammamet Tunisia.
- Participation in "The third International Conference on Advances in Mechanical Engineering and Mechanics, ICAMEM 2006", December 17-19, 2006 at Hammamet, Tunisia.
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* Title : NONLINEAR STRUCTURAL MECHANICS OF MICRO AND NANO SYSTEMS
* Keywords: Snap-through, Capillary forces, Carbon nanotubes, Drop-table test, Shallow arches…
* Supervisors:
- Pr. Mohammad Younis (Binghamton University, NY, USA)
* Defense day: November 5th, 2010;
* Abstract:
This dissertation presents an investigation into modeling and analyzing the nonlinear structural mechanics of micro and nanoelectromechanical systems (MEMS and NEMS).
The first part of this dissertation is concerned with micro systems. Instability problems of microbeams under the effect of capillary forces and mechanical shock loads are investigated. It is demonstrated that capillary forces has significant effect on the stability of microbeams. Also it is shown that by biasing stiff microbeams with electrostatic voltages, their stiffness is weakened, which enables testing them with the in-house shock testing equipments, such as drop table tests. The majority of the work of this part is focused on investigating theoretically and experimentally the dynamics of clamped-clamped micromachined arches when actuated electrically. The results show softening type behavior for the fundamental frequency, frequency bands with dynamic snap-through for both the fundamental and the third natural frequencies, dynamic pull-in for high level of AC loads, and possibility of internal resonance among some of the modes.
The second part of the dissertation is concerned with the dynamics of electrically actuated carbon nanotubes (CNTs) resonators. The behaviors of both straight and curved (slacked) CNTs are investigated. The results show complex nonlinear dynamics phenomena, such as hysteresis, dynamic pull-in, hardening and softening behaviors, and frequency bands with an inevitable escape from a potential well. Also, for slacked CNTs, various scenarios for mode crossing and mode veering (with possibility of energy exchange) are demonstrated as the levels of slack and DC load are varied.
Got a PhD in the Mechanical Engineering Dapartment ( Please click here to consult The BU Mechanical Engineering Department Web Page) at Binghamton University for several reasons:
- In the area of Micro and Nano Electro-Mechanical Systems, MEMS/NEMS from Binghamton University, NY, USA. Binghamton University with its comprehensive facilities (Innovative Technologies Complex) and competent faculty members in the field of microtechnology offered me the chance to cope with the latest research developments in this field;
- I was under the supervision of an imminent professor in this field, Pr. Mohammad I Younis (Binghamton University, USA) Pr. Mohammad Younis Webpage.
- Main courses: finite element method I and II, structural mechanics, fluid mechanics, continuum mechanics, control of structures, vibrations, perturbation techniques.
- Admitted in the first session (September 2006 --> April 2007) with distinction (Top student with the first price);
- Master thesis Dissertation (second session: January 2007 --> December 2007):
Objectives:
* Perform the control strategy of an electrostatically-actuated clamped-clamped microbeam in order to better its filtering features and render it behaves like a Van Der Pol and/or Rayleigh Oscillator;
* Study the nonlinear dynamics of a cantilever microbeam coupled to a microplate at its free end;
--> For more detailts (Abstact, defense date ,...) just consult the second section of this Curriculum Vitea.
- Main courses: finite element method, design theory, petroleum industry, robotics and mechanics, plates and shells, soil mechanics, aerodynamics, energy of buildings, theory of structures I and II, mechanic of materials, geophysics, signal processing, thermodynamics, accounting, electronics, continuum mechanics, fundamental sciences, economics, management, computer science ( C, Unix)…
- Price of the major of the promotion 2004-2007 of Tunisia Polytechnic School.
- Download The integral program studies in TPS (French version)
- Download The brochure of the Tunisia Polytechnic School (French version)
- Main courses: mathematics, physics, chemistry, general mechanics, engineering drawing, automatic control systems.
- Price of the second rank at the second year of Tunis Preparatory Engineering Institute.
* Project : "Nonlinear Dynamics and Control of Microbeam Based Systems"
* Supervisors:
- Pr. Ali NAYFEH (Virginia Tech, USA, Main Advisor) Pr. Nayfeh Webpage
- Pr. Slim CHOURA (Ecole Polytechnique de Tunisie, Tunisia)
- Pr. Eihab ABDEL-RAHMAN (University of Waterloo, Canada)
* Thesis Defense: January 4th, 2008;
* Appreciation: Exceptional, with grade 18/20.
* Subject : "Feedback Control and Nonlinear Dynamics of Microbeam Resonators"
* Supervisors:
- Pr. Ali NAYFEH (Virginia Tech, USA);
- Pr. Slim CHOURA (Ecole Polytechnique de Tunisie, Tunisia);
- Pr. Eihab ABDEL-RAHMAN (University of Waterloo, Canada).
* Appreciation: Exceptional, grade: 19/20;
* Abstract published in the EPT Magazine (Internal School Magazine): see here
* I get the best Graduation Project award of the 2007 Tunisia Polytechnic School promotion.
Tasks: Development of a computer aided code for the design of steel bars in a foundation and modeling a Pond of stocking with SAP2000 done in a purification station site.
Softwares used: SAP2000+MATLAB.
Tasks:
- Work on production units;
- Optimization of the work of the maintenance workshops (boilermaking, mechanics, instrumentation and electric) ;
- Stain miscellaneous in the maintenance workshops: electric arc welding.
• Arab (mother tongue): read, written and spoken.
• French: read, written and spoken.
• English: read, written and spoken ( TOFEL obtained on 05/12/07 with a score of 547)
• Development and programming languages: C, Turbo Pascal.
• Softwares :
- Scientific: Matlab/Simulink, Maple, AutoCAD, Protel, DIANA (finite element method software), Sap2000, Catia.
- Others: Flash, Adobe Photoshop …
• Operating Systems: Linux, Windows (95, 98, XP), MS DOS.
- US, Tunisian, and Qatari driver licenses;
- Sports: Tennis Table, Swimming, Football, Volleyball …
- Leisure: cinema, music;
- Redactor in the Tunisia Polytechnic School magazine EPTmag in 2005 EPTMag Web page (Internal magazine at TPS);
- Member of the soccer team of Binghamton University (2009-2010) and of the Tunisia Polytechnic School (2006-2007);
- Member of the clubs environment and speleology of the Faculty of Science of Bizerta (FSB Web Page);
- Participation in the open days at Tunisia Polytechnic School, "EPT-Enterprises" in 2005 with the supervision of the Eng. Najed Ksouri.