Mohammad I Younis
Assistant Professor
Ph.D., Virginia Polytechnique Institute and State University, 2004
Room: EB-S20
Phone: (607)-777-4983
Fax: (607)-777-4620
E-mail: mailto:myounis@binghamton.edu
Other personal links:
http://research.binghamton.edu/TT/Younis.html

Research interests: MEMS, NEMS; linear/nonlinear dynamics and vibrations; structural mechanics, and perturbation methods.

Current teaching activities:
Dynamics of MEMS and Microsystems (ME521)
Advanced Dynamics (ME523)
Advanced Vibrations (ME524)
Intermediate Dynamics (ME425)
Mechanical Vibrations (ME421)
Nonlinear System Dynamics (ME629).

Dr. Mohammad Younis received a B.S. in Mechanical Engineering from Jordan University of Science and Technology, Irbid, Jordan, in 1999 and M.S. and Ph.D. degrees in Engineering Mechanics in 2001 and 2004 from Virginia Polytechnique Institute and State University.

Prof. Younis is the recipient of the Paul E. Torgersen Graduate Research Excellence Award of the College of Engineering at Virginia Tech, 2002 and the Rank-First-on-the-Class Award, 1999 from Jordan University of Science and Technology, Irbid, Jordan. He is a member of the American Society of Mechanical Engineers (ASME) and the Jordan Engineers Association.

Research description:
Professor Younis’s research goal is to utilize the knowledge gained from understanding the exceptional mechanical and motion aspects of microstructures in multi-physics fields to design, optimize, and invent MEMS devices of distinctive characteristics and superior performance.

Professor Younis works on designing, modeling, and characterizing MEMS and NEMS devices and structures with a focus on their mechanical and motion aspects. His research include designing novel MEMS sensors and switches, such as developing a threshold switch triggered by mechanical shock and a capacitive switch that operates at reduced voltage. His research encompasses modeling MEMS devices and structures under coupled multi-physics (mechanical, electrostatic, squeeze-film, thermoelastic) forces, developing reduced-order models and computationally efficient approaches to tackle the coupled multi-physics and nonlinear problems, analyzing MEMS phenomena, such as the dynamic pull-in instability, and investigating the reliability of microstructures under mechanical shock.  Prof. Younis has analyzed and characterized various MEMS devices including accelerometers, threshold switches, mass sensors, thermal actuators, resonant sensors, and RF switches and filters.

 

The MEMS characterization and motion lab and research group: Professor Younis's MEMS characterization and motion lab include the state-of-the-art computational capabilities, such as the multi-physics finite-element software ANSYS, MATLAB, MATHMATICA, and FORTRAN, beside assortment of high-speed computers and workstations. Professor Younis's research group is trained to utilize their analytical, computational, and experimental skills to achieve their research goals. The research group conducts their experimental work in the Vibrations Research Laboratory and the Microacoustic Sensors Laboratory, which are shared with Prof. Ronald Miles and James Pittarrissi. Those labs contain variety of instruments and data acquisition systems for characterizing the mechanical and motion aspects of MEMS devices and structures, such as a MEMS vibration and topology measurement system: Polytec MSA-400 Micro System Analyzer http://www.polytec.com/usa/158_6778.asp, three laser vibrometers, shakers and shaker tables with controllers, a custom-made vacuum-chamber-pressure system for measuring squeeze-film damping effects in MEMS, two drop tables, a sound isolation chamber, and labVIEW and Siglab DSP data acquisition systems.

Research Positions: We are always looking for enthusiastic hardworking students to join our group. We are looking for individuals with strong passion toward MEMS and their mechanical behavior. Because of the multidisciplinary nature of our research, the candidate is desirable to have strong analytical and computational background and is preferred to have some experimental and microfabrication experience. If you are interested in joining our group please email your CV to Prof. Younis.

Publications:

I-Journal Paper

  1. Al-Saleem, F. M. and Younis, M. I, "An Investigation into the effect of the PCB motion on the dynamic response of MEMS devices under mechanical shock loads," J. Microelectromech. Syst., submitted.

  2. Al Saleem, F., Younis, M. I., and Miles, R., "An investigation for the effects of packaging on the response of a MEMS device under mechanical shock loads," ASME Journal of Electronics Packaging, submitted.

  3. Jordy, D, Younis, M. I., and Deeds, M., "Characterization of the Dynamical Response of a Micromachined G-Sensor to Mechanical Shock Loading under the Influence of Squeeze-Film Damping," Journal of Dynamic Systems, Measurement, and Control; submitted.

  4. Younis, M. I., Al-saleem, F. M., Miles, R., and Su Q., “Characterization for the performance of capacitive switches activated by mechanical shock,” J. Micromech. Microeng., Vol. 17, pp. 1360-1370, 2007.

  5. Younis, M. I., Al Saleem, F., and Jordy, D., “The Response of Clamped-Clamped Microbeams under Mechanical Shock,” International Journal of Nonlinear Mechanics, Vol. 42, pp. 643-657, 2007.

  6. Younis, M. I., Jordy, D., and Pitarresi, J., “Computationally Efficient Approaches to Characterize the Dynamic Response of Microstructures under Mechanical Shock,” J. Microelectromech. Syst, Vol. 16, pp. 628-638, 2007.

  7. Younis, M. I. and Nayfeh, A. H., “Simulation of squeeze-film damping of microplates actuated by large electrostatic load,” ASME Journal of Computational and Nonlinear Dynamics, Vol. 2, pp. 232-241, 2007.

  8. Nayfeh, A. H., Younis, M. I., and Abdel-Rahman, E. M., "Dynamic Pull-in Phenomenon in MEMS Resonantors," Nonl. Dyn., Vol. 48, pp. 153-163, 2007.

  9. Younis, M. I., Miles R., and Jordy D., "Investigation of the response of microstructures under the combined effect of mechanical shock and electrostatic forces," J. Micromech. Microeng., Vol. 16, pp. 2463-2474, 2006.

  10. Nayfeh, A. H. and Younis, M. I. "Dynamics of MEMS resonators under superharmonic and subharmonic excitations," J. Micromech. Microeng., Vol. 15, pp. 1840--1847, 2005.

  11. Nayfeh, A. H., Younis, M. I., and Abdel-Rahman, E. M., "Reduced-order models for MEMS applications," Nonl. Dyn, Vol. 41, pp. 211--236, 2005.

  12. Abdel-Rahman, E. M., Younis, M. I., and Nayfeh, A. H., "Finite-amplitude motions of resonators and their stability," Journal of Computational and Theoretical Nanoscience, Vol. 4, pp. 385--391, 2004.

  13. Nayfeh, A. H. and Younis, M. I. "Modeling and simulations of thermoelastic damping in microplates," J. Micromech. Microeng, Vo. 14, pp. 1711--1717, 2004.

  14. Nayfeh, A. H. and Younis, M. I. "A new approach to the modeling and simulation of flexible microstructures under the effect of squeeze-film damping," J. Micromech. Microeng., Vo. 14, pp. 170--181, 2004.

  15. Younis, M. I., Abdel-Rahman, E. M., and Nayfeh, A. H., "A reduced-order model for electrically actuated microbeam-based MEMS,'' J. Microelectromech. Syst., Vol. 12, pp. 672--680, 2003.

  16. Younis, M. I. and Nayfeh, A. H., "A study of the nonlinear response of a resonant microbeam to an electric actuation," Nonl. Dyn., Vol. 31, pp. 91--117, 2003.

  17. Abdel-Rahman, E. M., Younis, M. I., and Nayfeh, A. H., "Characterization of the mechanical behavior of an electrically actuated microbeam," J. Micromech. Microeng., Vol. 12, pp. 759--766, 2002.



II-Conference Papers and Presentations

  1. Al-saleem, F. M., Younis, M. I., Miles, R., and Su Q., "Experimental and Theoretical Investigation of New Capacitive Switches Activated by Mechanical Shock and Acceleration", in Proc. of the 21st Biennial Conference on Mechanical Vibration and Noise (VIB), September 4-7, 2007, Las Vegas, Nevada, DETC2007-35417.

  2. Jordy, D. and Younis, M. I., "Characterization of the Dynamical Response of a Micromachined G-Sensor to Mechanical Shock Loading", in Proc. Of the 21st Biennial Conference on Mechanical Vibration and Noise (VIB), September 4-7, 2007, Las Vegas, Nevada, DETC2007-34843.

  3. Younis, M. I., "Investigation into the Reliability of Microstructures under Mechanical Shock," US-Tunisia Workshop: Research and Educational Advances in Design and Fabrication of Micro-Electro-Mechanical Systems, Hammamet, Tunisia, December, 2006 (presentation).

  4. Younis, M. I., Pitarresi, J., and Jordy, D., "Analyzing microbeams dynamics under mechanical shock," ," in Proc. The Third International Conference on Advances in Mechanical Engineering and Mechanics (ICAMEM 2006), Hammamet, Tunisia, December, 2006, MEMS02.

  5. Alsaleem, F. and Younis, M. I., "An Investigation for the effect of packaging on the response of MEMS devices under shock loads," in Proc. The Third International Conference on Advances in Mechanical Engineering and Mechanics (ICAMEM 2006), Hammamet, Tunisia, December, 2006, MEMS01.

  6. Younis, M. I., Jordy, D., and Pitarresi, J., "Computationally efficient approaches to simulate the dynamics of microbeams under mechanical shock," 2006 ASME International Mechanical Engineering Congress and Exposition IMECE'06, Chicago, IL, 2006, IMECE2006-14115.

  7. Younis, M. I., Jordy, D., and Pitarresi, J., " Dynamics of microbeams under mechanical shock," eleventh conference in nonlinear vibrations, stability, and dynamic of structures, Blacksburg, VA, August, 2006 (Abstract and presentation).

  8. Younis, M. I. and Miles, R., " Response of MEMS devices under shock loads," Proceedings of the 2005 ASME International Mechanical Engineering Congress and Exposition IMECE'05, Orlando, FL, 2005, IMECE2005-81217.

  9. Younis, M. I., and Nayfeh, A. H., "Modeling squeeze-film damping of electrostatically actuated microplates undergoing large deflections," in Proc. 20th Biennial Conference on Mechanical Vibration and Noise (VIB), Long Beach, CA, IDETC2005-84421, 2005.

  10. Nayfeh, A. H., Younis, M. I., and Abdel-Rahman, E. M., "Dynamic analysis of MEMS resonators under primary resonance excitation," in Proc. 20th Biennial Conference on Mechanical Vibration and Noise (VIB), Long Beach, CA, IDETC2005-84146, 2005.

  11. Nayfeh, A. H. and Younis, M. I., "Subharmonic excitation for electrically actuated microbeams," in Proc. 20th Biennial Conference on Mechanical Vibration and Noise (VIB), Long Beach, CA, DETC2005-84144, 2005.

  12. Nayfeh, A. H., Younis, M. I., and Abdel-Rahman, E. M., "Reduced-order modeling of MEMS," Third MIT conference on computational fluid and solid mechanics, Cambridge, MA, July 14-17, pp. 394-400, 2005.

  13. Younis, M. I., Abdel-Rahman, E. M., and Nayfeh, A. H., "Global dynamics of MEMS resonators under superharmonic excitation," the International Conference on MEMS, NANO, and Smart Systems, Banff, Canada (ICMENS), August 2004, pp. 694-699.

  14. Nayfeh, A. H., Younis, M. I., and Abdel-Rahman, E. M., "Dynamic Pull-in Phenomenon in MEMS Resonant Sensors and RF Switches," Tenth conference in nonlinear vibrations, stability, and dynamic of structures, Blacksburg, VA, July, 2004 (Presentation).

  15. Nayfeh, A. H. and Younis, M. I. "A model for thermoelastic damping in microplates," 2004 Nanotechnology NanoTech 2004: in Proc. the 7th International Conference on Modeling and Simulation of Microsystems, Boston, March 2004, pp. 255 - 258.

  16. Younis, M. I. and Nayfeh, A. H. "Microplates modeling under a coupled structural-fluidic-electrostatic forces," NanoTech 2004: in Proc. the 7th International Conference on Modeling and Simulation of Microsystems, Boston, March 2004, pp. 251 - 254.

  17. Younis, M. I., Abdel-Rahman, E. M., and Nayfeh, A. H., "Dynamic simulations of a novel RF MEMS switch," NanoTech 2004: in Proc. the 7th International Conference on Modeling and Simulation of Microsystems, Boston, March 2004, pp. 287-290.

  18. Abdel-Rahman, E. M., Younis, M. I., and Nayfeh, A. H., "A nonlinear reduced-order model for electrostatic MEMS," in Proc. 19th Biennial Conference on Mechanical Vibration and Noise (VIB), Chicago, IL, 2003, paper # DETC2003/VIB-48517.

  19. Abdel-Rahman, E. M., Nayfeh, A. H., and Younis, M. I., "Dynamics of an electrically actuated resonant microsensor," in Proc. International Conference on MEMS, NANO and Smart Systems (ICMENS), Banff, Canada, pp. 188 -196, 2003.

  20. Younis, M. I., Abdel-Rahman, E. M., and Nayfeh, A. H., "A reduced-order model for electrically actuated resonators and microswitches," Ninth conference in nonlinear vibrations, stability, and dynamic of structures, Blacksburg, VA, July, 2002 (Abstract and presentation).

  21. Younis, M. I., Abdel-Rahman, E. M., and Nayfeh, A. H., "Static and dynamic behavior of an electrically excited resonant microbeam,'' in Proc. 43rd AIAA Structures, Structural Dynamics, and Materials Conference, Denver, CO, AIAA Paper # 2002-1305, 2002.


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