This paper deal with a semi-active type bush design and magnetic analysis associated with the magnetorheological elastomer. It is focused on the magnetic field intensity analysis with 3 coil structure. The bush design consists of 3 coil structure of the bush in order to apply the magnetic field. As a result of first investigation, it is found that MRE thickness and electric current are most important parameters to design an effective bush. From the magnetic analysis, it is identified that the magnetic permeability of the MRE is lower than MR fluid. In addition, the bush model is formulated to have the uniformity of the magnetic flux and intensity field distribution.
Magnetorhological fluids (MR) have been applied to numerous devices or systems which require forward or feedback control to achieve desired performances. One of applications is the rehabilitation device. MR dampers applied to artificial joints are implemented with two phases; stance phase: motion to support the feet on the ground, and swing phase : motion to step out. In case of stance phase, the damping force should be increased by applying the magnetic field to support the body. On the other hand, in case of swing phase, the damping force should be removed by not applying the magnetic field so that the prosthesis can be easily rotated by the motor. In this study, a special mechanism of MR damper is proposed to make a prosthetic leg which can derive on/off mode using permanent magnet only. The design mechanism is undertaken and damping force is analyzed to validate the effectiveness of the proposed damper system for the patient’s motion without control device.
An accurate position control is demanded in the current hydraulic lifter used for vehicle maintenance. This work
presents a new type of vehicle lifter for precision position control using a magnetorheological valve system. In the first
step, the principal design parameters such as gap size of oil passage, length and depth of coil part, and distance coil part
from the end of valve are considered to achieve the objective function for getting the highest position accuracy under
current input constraint. After determining the optimized design values, the field-dependent pressure drops of the
optimized valve system are experimentally evaluated and compared to those obtained from the initial design.
Subsequently, the position of the vehicle lifter is controlled by change of pressure drop using a simple PID controller. It
is demonstrated that the proposed vehicle lifter can be effectively applied to vehicle service center for more accurate
tasks under proper height.
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