Mohammad Mahinfalah, Ph.D.
Professor, Program Director MS Engineering Milwaukee School of Engineering
Milwaukee School of Engineering
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Education, Licensure and Certification
Ph.D.
Engineering Mechanics
Iowa State University
1988
M.S.
Engineering Mechanics
Iowa State University
1985
B.S.
Mechanical Engineering
Iowa State University
1981
Biography
Areas of Expertise
Accomplishments
ASME Outstanding Student Section Advisor Award
2019
Falk Engineering Educator Award, MSOE
2012
American Society of Mechanical Engineers (ASME) : Fellow
2011
American Society of Mechanical Engineers (ASME), District C, Faculty Advisor of the Year
2006
ASME Dedicated Service Award
2005
ASME, Region VII Faculty Advisor of the Year
1997
Outstanding Teacher of the Year Award
1992-1993
College of Engineering and Architecture, North Dakota State University
Pi Tau Sigma and Pi Upsilon Chapter Carnot Award
1991-1992
Iowa State University Teaching Excellence Award
1987
Affiliations
- American Society of Mechanical Engineers (ASME) : Member
Social
Event and Speaking Appearances
Suspended Decoupler Design of Hydraulic Engine Mounts
ASME International Mechanical Engineering Congress & Exposition Denver, CO, November 11-17, 2011
A Component Centric Approach to Structural Analysis of Mechanisms
ASME International Mechanical Engineering Congress & Exposition Montreal, Canada, November 14-20, 2014
Design of a low cost Apparatus for Torsion Testing
ASME International Mechanical Engineering Congress & Exposition Montreal, Canada, November 14-20, 2014
Finite Element Verification of the Mathematical Modeling of Thermal Effects in Flexural Microcantilever resonators Dynamics
ASME International Mechanical Engineering Congress & Exposition Vancouver, British Columbia, Canada, November 12- 18, 2010
Acceleration in Kinematics
ASME International Mechanical Engineering Congress & Exposition Denver, CO, November 11-17, 2011
Patents
Direct write and freeform fabrication apparatus and method
US20050288813A1
2005
A direct write or freeform fabrication apparatus and process for making a device or a three-dimensional object. By way of example the method comprises: (a) providing a target surface on an object-supporting platform; (b) operating a material deposition sub-system comprising a liquid deposition device for dispensing at least a liquid composition and a solid powder-dispensing device for dispensing solid powder particles to selected locations on the target surface; (c) operating a directed energy source for supplying energy to the dispensed liquid composition and the dispensed powder particles to induce a chemical reaction or physical transition thereof at the selected locations; and (d) moving the deposition sub-system and the object-supporting platform relative to one another in a plane defined by first and second directions to form the dispensed liquid composition and the dispensed powder particles into the device or object. An apparatus is also provided for carrying out this process.
Research Grants
Direct Write Technology
M. Mahinfalah (PI) and Bor Jang (co PI)
2004
Phase III, CNSE
Low and Hyper Velocity Impact of Silicon Carbide Particle Sandwich Composite
M. Mahinfalah (PI) and John Hurley
2005
Senior Design Coordinator
M. Mahinfalah
2011 - 2012
Selected Publications
Effects of Nonlinearities on the Steady State Dynamic Behavior of Electric Actuated Microcantilever-based Resonators
Journal of Vibration and ControlR.N. Jazar, M. Mahinfalah, N. Mahmoudian, M.A. Rastgaar
2009
This paper presents the dynamic behavior of microcantilever-based microresonators and compares their steady state behavior for polarized and nonpolarized systems at different levels of nonlinearities. A microcantilever, equipped with a time-varying capacitor, makes the microresonator system. The capacitor is activated by a constant polarization voltage, and an alternative actuating voltage. The partial differential equation of motion of the vibrating electrode can be reduced to a highly nonlinear parametric second order ordinary differential equation. The steady state behavior of the microresonator has been analyzed with and without polarization voltage. The main characteristic of the non-polarized model is explained by the stability of the system in parameter plane. A set of stability chart is provided to predict the boundary between the stable and unstable domains. Furthermore, the main characteristic of the polarized model is determination by the period-amplitude relationship of the system. Applying perturbation methods, analytical equations are derived to describe the frequency response of the system, which are suitable to be utilized in parameter study and design.
Energy-rate method and stability chart of parametric vibrating systems
Journal of the Brazilian Society of Mechanical Sciences and EngineeringJazar, R.N., Mahinfalah, M., Mahmoudian, N., Rastgaar, M.A.
2008
The Energy-Rate method is an applied method to determine the transient curves and stability chart for the parametric equations. This method is based on the first integral of the energy of the systems. Energy-Rate method finds the values of parameters of the system equations in such a way that a periodic response can be produced. In this study, the Energy-Rate method is applied to the following forced Mathieu equation:
y" + hy' + (1 - 2β + 2β cos (2rt)) y = 2β sin2 (rt)
This equation governs the lateral vibration of a microcanilever resonator in linear domain. Its stability chart in the β-r plane shows a complicated map, which cannot be detected by perturbation methods.
Third-order systems: Periodicity conditions
International Journal of Non-Linear MechanicsJazar, R.N., Mahinfalah, M., Mehri, B.
2009
Recently a third-order existence theorem has been proven to establish the sufficient conditions of periodicity for the most general third-order ordinary differential equation.
Effects of Nonlinearities on the Steady State Dynamic Behavior of Electric Actuated Microcantilever-based Resonators
Journal of Vibration and ControlJazar, R.N., Mahinfalah, M., Mahmoudian, N., Rastgaar, M.A.
2009
This paper presents the dynamic behavior of microcantilever-based microresonators and compares their steady state behavior for polarized and nonpolarized systems at different levels of nonlinearities. A microcantilever, equipped with a time-varying capacitor, makes the microresonator system. The capacitor is activated by a constant polarization voltage, and an alternative actuating voltage. The partial differential equation of motion of the vibrating electrode can be reduced to a highly nonlinear parametric second order ordinary differential equation. The steady state behavior of the microresonator has been analyzed with and without polarization voltage. The main characteristic of the non-polarized model is explained by the stability of the system in parameter plane. A set of stability chart is provided to predict the boundary between the stable and unstable domains. Furthermore, the main characteristic of the polarized model is determination by the period-amplitude relationship of the system. Applying perturbation methods, analytical equations are derived to describe the frequency response of the system, which are suitable to be utilized in parameter study and design.
Suspended Decoupler: A New Design of Hydraulic Engine Mount
Advances in Acoustics and VibrationChristopherson, J., Mahinfalah, M., Jazar, R.N.
2011
Because of the density mismatch between the decoupler and surrounding fluid, the decoupler of all hydraulic engine mounts (HEM) might float, sink, or stick to the cage bounds, assuming static conditions. The problem appears in the transient response of a bottomed-up floating decoupler hydraulic engine mount. To overcome the bottomed-up problem, a suspended decoupler design for improved decoupler control is introduced. The new design does not noticeably affect the mechanism's steady-state behavior, but improves start-up and transient response. Additionally, the decoupler mechanism is incorporated into a smaller, lighter, yet more tunable and hence more effective hydraulic mount design. The steady-state response of a dimensionless model of the mount is examined utilizing the averaging perturbation method applied to a set of second-order nonlinear ordinary differential equations. It is shown that the frequency responses of the floating and suspended decoupled designs are similar and functional. To have a more realistic modeling, utilizing nonlinear finite elements in conjunction with a lumped parameter modeling approach, we evaluate the nonlinear resorting characteristics of the components and implement them in the equations of motion.
