Dr. The M. Nguyen Profile

Dr. The M. Nguyen

Assistant Professor at California State Univ Fresno

SPIE Involvement:

Author

Area of Expertise:

Smart Materials , Noise and Vibration , Machine Design , FEA

Publications (6)

Proceedings Article | 1 April 2014 Paper

Prosthetic leg powered by MR brake and SMA wires

The Nguyen, Vicente Munguia, Jose Calderon

Proceedings Volume 9057, 90572S (2014) https://doi.org/10.1117/12.2049398

KEYWORDS: Shape memory alloys, Actuators, Magnetism, Magnetorheological finishing, Motion models, Data modeling, Aluminum, Process control, Safety, Network architectures

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Proceedings Article | 10 April 2010 Paper

Structural considerations in designing magnetorheological fluid mounts

The Nguyen, Constantin Ciocanel, Mohammad Elahinia

Proceedings Volume 7643, 764314 (2010) https://doi.org/10.1117/12.848908

KEYWORDS: Magnetorheological finishing, Mathematical modeling, Fluid dynamics, Vibration isolation, Magnetism, Structural design, Switching, Optical isolators, Smart materials, Shape memory alloys

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Modern vehicles have been increasingly equipped with advanced technologies such as hybrid and cylinder-on-demand to enhance fuel efficiency. These technologies also come with vibration problems due to the switching between the power sources or the variation of the number of active cylinders. To mitigate these vibrations, a large variety of vibration isolators have been proposed, ranging from passive to active isolators. Semi-active mounts are often preferred to other solutions because of their overall low power requirement in operation as well as relatively simpler configurations. Among the semi-active categories, the magnetorheological fluid (MRF) mounts have been proven to be a viable solution for modern vehicle vibration isolation. These mounts can change their stiffness and damping characteristic without involving moving parts, by controlling the yield stress of the MRF housed inside the mount by means of magnetic field. This study looked into several innovative designs for MRF mounts. The characteristics of the mount depend significantly on the compliances of the rubber, the number and arrangement of the fluid chambers and the number of flow passages connecting the chambers. These parameters provide the designers with various options to design the mounts to function in various conditions and over a wide range of frequencies. Different values of the aforementioned parameters were selected to form specific designs with certain characteristics. Mathematical models have been developed for each design and MATLAB/Simulink was used to simulate the response of each mount to certain excitations. As the hydraulic and magnetorheological (MR) effects are dominant in the mount, the elastomer behavior is considered linear. A discussion of the advantages and disadvantages of each design, based on the simulated response, is presented. The outcomes of this study can be a useful reference for MRF mount designers and leads to the development of a general MRF mount design methodology.

Proceedings Article | 7 April 2009 Paper

Development of an innovative energy harvesting device using MFC bimorphs

Majid Tabesh, The Nguyen, Amin Motlagh, Mohammad Elahinia

Proceedings Volume 7288, 72880F (2009) https://doi.org/10.1117/12.817576

KEYWORDS: Microsoft Foundation Class Library, Wind energy, Energy harvesting, Capacitors, Composites, Fluctuations and noise, Sensors, Actuators, Finite element methods, Smart materials

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Proceedings Article | 7 April 2009 Paper

Analytical modeling and experimental validation of a magnetorheological mount

The Nguyen, Constantin Ciocanel, Mohammad Elahinia

Proceedings Volume 7288, 72881D (2009) https://doi.org/10.1117/12.816014

KEYWORDS: Magnetism, Fluid dynamics, Analytical research, Mathematical modeling, Vibration isolation, Prototyping, Aluminum, Electromagnetism, Optical isolators, Performance modeling

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Proceedings Article | 18 April 2008 Paper

Design and modeling of a mixed mode magnetorheological (MR) fluid mount

Constantin Ciocanel, The Nguyen, Mohammad Elahinia

Proceedings Volume 6928, 69281C (2008) https://doi.org/10.1117/12.775993

KEYWORDS: Magnetism, Magnetic tracking, Fluid dynamics, Vibration isolation, Switching, Hybrid vehicles, Control systems, Resistance, Amplifiers

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Proceedings Article | 17 March 2006 Paper

A 6-DOF vibration isolation system for hydraulic hybrid vehicles

The Nguyen, Mohammad Elahinia, Walter Olson, Paul Fontaine

Proceedings Volume 6169, 61690G (2006) https://doi.org/10.1117/12.657909

KEYWORDS: Hybrid vehicles, Vibration isolation, Data modeling, Magnetism, Energy efficiency, Control systems, Motion models, Microfluidics, Interfaces, Pollution

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This paper presents the results of vibration isolation analysis for the pump/motor component of hydraulic hybrid vehicles (HHVs). The HHVs are designed to combine gasoline/diesel engine and hydraulic power in order to improve the fuel efficiency and reduce the pollution. Electric hybrid technology is being applied to passenger cars with small and medium engines to improve the fuel economy. However, for heavy duty vehicles such as large SUVs, trucks, and buses, which require more power, the hydraulic hybridization is a more efficient choice. In function, the hydraulic hybrid subsystem improves the fuel efficiency of the vehicle by recovering some of the energy that is otherwise wasted in friction brakes. Since the operation of the main component of HHVs involves with rotating parts and moving fluid, noise and vibration are an issue that affects both passengers (ride comfort) as well as surrounding people (drive-by noise). This study looks into the possibility of reducing the transmitted noise and vibration from the hydraulic subsystem to the vehicle's chassis by using magnetorheological (MR) fluid mounts. To this end, the hydraulic subsystem is modeled as a six degree of freedom (6-DOF) rigid body. A 6-DOF isolation system, consisting of five mounts connected to the pump/motor at five different locations, is modeled and simulated. The mounts are designed by combining regular elastomer components with MR fluids. In the simulation, the real loading and working conditions of the hydraulic subsystem are considered and the effects of both shock and vibration are analyzed. The transmissibility of the isolation system is monitored in a wide range of frequencies. The geometry of the isolation system is considered in order to sustain the weight of the hydraulic system without affecting the design of the chassis and the effectiveness of the vibration isolating ability. The simulation results shows reduction in the transmitted vibration force for different working cycles of the regenerative system.

Showing 5 of 6 publications

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