Design and Development of Semi-Active Concentric Spiral-Flow Magnetorheological Damper
Date Issued
2016
Date
2016
Author(s)
Chang, Kai-Hsiang
Abstract
Magnetorheological dampers (MR dampers) are the fluid viscous dampers which use MR fluid as working fluid medium. The MR fluid can be transformed from low viscosity Newtonian fluid to Bingham fluid with higher viscosity and shear stress within only microseconds by applying external magnetic field. Thus, the damping characteristic of MR dampers can be effectively controlled to absorb the impact or vibration energy. In this thesis, a semi-active concentric spiral-flow magnetorheological damper (CSF damper) has been developed with the concentric spiral-flow channel. The spiral channel structure can keep the direction of magnetic field and flow perpendicular, and reduce the total size of CSF damper. The performance test of CSF damper was measured and conducted by using the MTS_810 tensile machine. The damper has been driven by sine wave movements with specific frequencies and amplitudes. By the result, the damping force is 304 N with the input frequency of 0.25 Hz and amplitude of ±1 mm without applied magnetic field, and reaches its maximum value as 1034 N with 2.0 A as the current to the coil for the applied magnetic field. The dynamic ratio of developed CSF damper is 3.4 (1034/304). Therefore, the semi-active vibration controlling effect can be easily regulated by the modulating of input current. The CSF damper is modeled based on the Bouc-Wen hysteresis model with MATLAB and Simulink. Furthermore, GA-Fuzzy control method has been adopted where the damping coefficient of CSF damper is controlled by regulating magnetic field. The result shows that the SDOF system can effectively reduce 47.5% of stimulated vibration. With the concept of the concentric spiral-flow channel, the developed CSF damper can achieve a wide range of dynamic ratio. The passive damping function provides the main damping effect by the viscous drag, and the active damping function realized the adjustable damping. By the utilization of GA-Fuzzy control, the semi-active vibration control can be effectively applied.
Subjects
Concentric spiral-flow channel
Magnetorheological fluid
Damper
GA-Fuzzy control rule
Type
thesis
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