Mohammad Mahinfalah, Ph.D.
Professor, Program Director MS Engineering | Milwaukee School of Engineering
Milwaukee, WI, UNITED STATES
Mohammad Mahinfalah is an expert in impact testing and vibrations.
Education, Licensure and Certification (3)
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
Dr. Mohammad Mahinfalah is a professor and program director in MSOE's Mechanical Engineering Department. He teaches Advanced Mechanical System Design, Experimental Stress Analysis, and Senior Design. He earned his bachelor's degree in mechanical engineering, and his master's and doctorate degrees in engineering mechanics. All three degrees were obtained from Iowa State University. He was awarded the 2011-2012 Falk Teaching & Service Award from MSOE, the 2006 Faculty Advisor of the Year from the American Society of Mechanical Engineers (ASME), 2005 ASME Dedicated Service Award, 1997 ASME Region VII Faculty Advisor of the Year, and 1997 Apple Polisher Award. He also has teaching experience at North Dakota State University, Fargo and Iowa State University, and has industry and consulting experience across a variety of organizations.
Areas of Expertise (4)
Impact Testing and Vibrations
Experimental Mechanics
Mechanical Engineering
Composite Materials
Accomplishments (9)
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 (1)
- American Society of Mechanical Engineers (ASME) : Member
Event and Speaking Appearances (5)
Acceleration in Kinematics
ASME International Mechanical Engineering Congress & Exposition Denver, CO, November 11-17, 2011
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
Design of a low cost Apparatus for Torsion Testing
ASME International Mechanical Engineering Congress & Exposition Montreal, Canada, November 14-20, 2014
A Component Centric Approach to Structural Analysis of Mechanisms
ASME International Mechanical Engineering Congress & Exposition Montreal, Canada, November 14-20, 2014
Suspended Decoupler Design of Hydraulic Engine Mounts
ASME International Mechanical Engineering Congress & Exposition Denver, CO, November 11-17, 2011
Patents (1)
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 (3)
Senior Design Coordinator
M. Mahinfalah $25,000
2011 - 2012
Low and Hyper Velocity Impact of Silicon Carbide Particle Sandwich Composite
M. Mahinfalah (PI) and John Hurley $29,288
2005
Direct Write Technology
M. Mahinfalah (PI) and Bor Jang (co PI) $130,000
2004 Phase III, CNSE
Selected Publications (5)
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.
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.
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.
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.
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.
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