Characterization of magnetorheological brake for speed control application

Magnetorheological (MR) brake is one of the brake-by-wire technologies which is developed using MR fluid by immersing it in MR brake mechanism. This study deals with the development of MR brake in order to characterize and implement control system for shaft speed application. It began from the literature review of previous study on MR brake and continue the development of MR brake with a test rig. The MR brake was characterized at various current in order to obtain the brake torque during braking. In addition, the MR brake was also characterized at various loads to study the response such as angular velocity, brake torque and displacement responses. Next, the mathematical model of MR brake was simulated and verified with the experimental data. Then, the study continues with performance evaluation of shaft speed control using MR brake. There are two controllers implemented and compared in order to study controller performance under the influence of loads. Two types of controllers, On-Off and PID have been implemented with MR Brake. According to the performance of both controllers, PID controller shows better performance compare to On-Off controller

Experimental Evaluations on Braking Responses of Magnetorheological Brake

This paper presents experimental evaluations on braking responses of Magnetorheological Brake (MR Brake) at various current and load. The MR brake consists of a rotating disk that immersed with Magnetorheological Fluid (MR Fluid) where the fluid behavior is changing under influence of magnetic fields. The experiments are performed using MR brake test rig to obtain three output responses namely the angular velocity response, torque response and load displacement response. The MR brake generates maximum torque at high current and causes fast decrement of shaft angular velocity. The effectiveness MR brake torque happens at minimum load with low stopping time

Modelling and validation of magnetorheological brake responses using parametric approach

Magnetorheological brake (MR Brake) is one x-by-wire systems which performs better than conventional brake systems. MR brake consists of a rotating disc that is immersed with Magnetorheological Fluid (MR Fluid) in an enclosure of an electromagnetic coil. The applied magnetic field will increase the yield strength of the MR fluid where this fluid was used to decrease the speed of the rotating shaft. The purpose of this paper is to develop a mathematical model to represent MR brake with a test rig. The MR brake model is developed based on actual torque characteristic which is coupled with motion of a test rig. Next, the experimental are performed using MR brake test rig and obtained three output responses known as angular velocity response, torque response and load displacement response. Furthermore, the MR brake was subjected to various current. Finally, the simulation results of MR brake model are then verified with experimental results

Validation and Experimental Evaluation of Magnetorheological Brake-by-Wire System

Magnetorheological brake is one of x-by-wire system which is performing better than conventional brake system. MR brake consists of a rotating disc that is immersed with magnetorheological fluid in an enclosure of an electromagnetic coil. The applied magnetic field will increase the yield strength of the MR fluid where this fluid was used to decrease the speed of the rotating shaft. The purpose of this paper is to develop a mathematical model to represent MR brake with a test rig. The MR brake model is developed based on actual torque characteristic which is coupled with motion of a test rig. Next, the experimental are performed using MR brake test rig and obtained three output responses known as angular velocity response,torque and load displacement. Furthermore, the MR brake was subjected to various loads and current. Finally, the simulation results of MR brake model are verified with experimental results

The magnetorheological fluid: testing on automotive braking system

This paper presents testing of the magnetorheological brake (MRB) in the braking system of a vehicle. Two techniques are used to determine the capability of the brake system, which are simulation via Matlab Simulink Software and experimental study by using a quarter vehicle test rig. A Proportional-Integral-Derivative (PID) is employed as a wheel speed control and enforces the MRB to produce the required braking torque need by a vehicle. A dynamic test, namely sudden braking test, is performed in three rotational speed conditions, which are from 127.5 rad/s (1200 rpm) to 31.42 rad/s (300 rpm), 52.37 Rad/s (500 rpm) and 73.31 rad/s (700 rpm) in two different wheel load which are 10 kg and 15 kg, respectively. The behaviours to be assessed are wheel speed response and brake torque produced by the MRB. From the observation, the MRB’s capability in providing the required brake torque is promising and harmony between simulation and experimental response

Experimental and Simulation Study of Honeycomb Core under Dynamic Loading

The objective of this project is to get the energy absorption of aluminium honeycomb core through experimental work and simulation analysis. The force-displacement behavior and energy absorb are studied for two different cell sizes of honeycomb core, which are 0.0127 m and 0.01905 m, respectively. The out-of-plane dynamic compression tests are conducted for the specimens by using INSTRON CEAST 9340 drop tower machine with an impact mass of 25 kg at 800 mm height and generate an impact velocity of 3.96 m/s. The linear elastic regime, flat plateau force regime and densification regime are observed in the force-displacement behavior in the crushing of aluminium honeycomb core. In finite element simulation, the model of honeycomb structures with 0.0127 m cell size is created in ABAQUS 6.12 in explicit environment. Several parameters such as mesh sizes, time intervals and plasticity models with Isotropic hardening and Johnson-Cook hardening are investigated in the simulation and validated with the experimental results. Isotropic plasticity model with 1 mm mesh size and 500-time interval is the optimum parameters in modelling aluminium honeycomb core with 0.0127 m cell size where the buckling mode of the specimen is similar with the experimental work

Performance Simulation Analysis for Magnetorheological Damper with Internal Meandering Flow Valve

Magnetorheological (MR) damper as a semi-activesystem for a vehiclesuspension is simulatedin this study. The proposed design of Magnetorheological (MR) valve consists of meandering flow channel or gaps that fixedin the piston of the damper. The focus of this study is to estimate the performance of proposed MR valve based on actual front suspension parameter of a vehicle. Annular and radial gaps are combined to produce an MR valve with meandering fluid flow path. Furthermore, the damper is filled with Magnetorheological (MR) fluid to energize the damper under the presenceof magnetic fields.The magnetic flux density within each gap is obtainedvia the Finite Element MethodMagnetics(FEMM)software. Therefore, the yield stress of MR fluid and magnetic flux relationships bothcan be predicted. The presentpaper shows a reduction in pressure dropwhenthe thickness of each gap is increased. Pressure drop is closely affected by the fluid flow rate thatenterseach gap. Thismeans thatthe lowerflow rate increases the pressure drop of MR valve at various curren

Design and characterisation of magnetorheological brake system

This paper investigates the performance of a magnetorheological brake (MR brake) system in terms of torque generated by various electric currents at various rotational shaft speeds. The MR brake consists of a rotating disc immersed with magnetorheological fluid (MR fluid) in an enclosure of an electromagnetic coil. The applied magnetic field will increase the yield strength of the MR fluid, which will decrease the speed of the rotating shaft. Then, different speeds were applied to the MR brake system continuously by changing the applied electric current. The methodology begins with the design using 3D modelling software followed by the development of a mathematical model of the MR brake. Then, magnetostatic analysis using ANSYS software was done by considering three parameters, which are magnetic field intensity, magnetic flux density and 2D flux lines. The torque response of the MR brake from the simulation was validated with experimental results and discussed. It can be noted that the MR brake torque increases proportionally with the increase in current and independent with varying speeds