Showing papers by "Quoc Hung Nguyen published in 2019"

Development of a new magnetorheological fluid–based brake with multiple coils placed on the side housings:

Abstract: In this research, a new configuration of magnetorheological fluid–based brake with multiple coils placed on each side of the brake housing (multiple side-coil magnetorheological fluid–based brake) ...

Aerodynamic Optimal Design for Horizontal Axis Wind Turbine Airfoil Using Integrated Optimization Method

Abstract: In this work, a new approach for aerodynamic optimization of horizontal axis wind turbine (HAWT) airfoil is presented. This technique combines commercial computational fluid dynamics (CFD) codes wi...

Speed control of rotary shaft at different loading torque using MR clutch

Abstract: This research focuses on development a speed control system of a rotary load shaft with different loading torque by using a clutch featuring magneto-rheological fluid (MRC). Firstly, a new configuration of a speed control system using MRC is proposed. Modeling of the MRC based speed control system is then derived based on Bingham plastic model of magneto-rheological fluid (MRF). Based on the derived model, an optimal design problem for the system is built and the optimal solution is obtained based on finite element analysis. Performance characteristics of the MRC based speed control system are then experimentally investigated. After that, the MRC based speed control system to control a varying rotary load shaft driven by an AC motor is proposed and a PID controller to control the speed is designed and implemented. Experiments on steady speed control of the rotary load shaft is then obtained and presented with remark discussions.

Development of a 3D haptic spherical master manipulator based on MRF actuators

Abstract: This research focuses on development of 3-DOF haptic master manipulator featuring Magneto-rheological brakes (MRBs) and a mechanism of spherical manipulator. The haptic manipulator is composed of a spherical manipulating mechanism integrated with 3 MR brakes. The first MRB is a rotary disc-type MRB employed at the waist joint to feedback the tangent force in the horizontal plane, the second MRB is also a rotary disc-type MRB employed at the shoulder joint to feedback the tangent force in the elevation plane, and the third MRB is a linear MRB employed at the prismatic joint to feedback the normal force (approach force). Position of the manipulator’s end-effector is measured by two rotary encoders and an LVDT. After the introduction, a configuration and working principle of the 3-DOF haptic spherical manipulator are presented. Mathematical models of the manipulator are then derived. The MRBs are then optimally designed to provide a required force feedback to the operator. A prototype haptic manipulator is then manufactured and its performance characteristics are then experimentally investigated.

Hysteresis Investigation of Shear-Mode MR Damper for Front-Loaded Washing Machine

Abstract: In this research, a shear-mode MR damper that can replace conventional passive damper of a front-loaded washing machine is designed, manufactured and an experiment based model is employed to characterize hysteresis behavior of the damper. Firstly, an optimized MR damper for front loaded washing machine is manufactured and an experimental system is set up for testing hysteresis behaviour of the damper. The experimental test is then conducted and presented. From experiential results, hysteresis of the damper is investigated and a suitable hysteresis model is proposed for the damper. The proposed hysteresis model of damper is then evaluated through experimental results.

Development of Magnetorheological Brake with Tooth-Shaped Disc for Small Size Motorcycle

Abstract: In this research, a new type of magneto-rheological brake (MRB) is proposed for small size motorcycle. The proposed MRB consists of a rotor with multiple trapezoidal teeth acting at multiple magnetic poles of the brake. In order to generate a magnetic field for controlling braking torque, a magnetic coil is placed on each side-housing of the brake. The inner face of each side-housing also has trapezoidal shape mating with the trapezoidal teeth of the rotor via MRF layer. By applying countercurrents to the coils, a magnetic fluid is generated with some magnetic flux going across the MRF layer (MRF duct) between the rotor teeth and their mating poles on the housing. By using multiple poles with trapezoidal shape, a high braking torque of the brake is expected while the size of the brake is still kept to be compacted. After an introduction about the development of MRBs in automotive engineering, the configuration of the proposed MRB is presented and its braking torque is derived based on Bingham rheological model of MRF. The proposed MRB is then optimally designed based on finite element analysis (FEA). Its optimized MRB is then manufactured and its braking performance is experimentally investigated. The MRB is then installed in a prototype motorcycle and the field test of this prototype motorcycle integrated with the MRB is then conducted.

Designing, Manufacturing and Testing the Cycling Training System Featuring Magnetorheological Brake

Abstract: In this study, a dual-disc magneto-rheological brake (MRB) with two coils placed on each side housing is proposed for a cycling training system. The cycling training system is integrated a positioning system to simulate the cycling process in different slope ranging from 0 to 150. By adjusting position of the bicycle, braking torque of the brake, a cyclist can experience different riding condition such as riding on flat road or steep road with the slope up to 15o.