| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 102 === Magnetorheological fluid (MR fluid) is applied to design the modular syringe-type MR fluid damper, which is integrated with normal viscous liquid into absorption of vibration system by bypass method. Characteristic of damper can be controlled by varying the external drive current to change the magnetic field and adjusting the cross-sectional area of throttle valve, and semi-active style absorption of vibration with real-time adjustment can be achieved.
The screwing magnetic adjustment rod is used to control the cross-sectional area of throttle valve. Magnet circuit passes through the adjustment rod that makes throttle valve become the viscosity varying area of viscous liquid. Theory calculation and Maxwell software are applied to simulate and analyze the influence of viscous liquid, while the magnetic field generated by drive current passing through the magnet circuit.
Using servo motor and ball screw to test the designed damper, including displacement, state of stress and velocity. According to the measurement, the viscosity of viscous liquid will change with the effect of magnetic field while decreasing path gap or increasing drive current, and the damping force can be enhanced. The biggest damping force of designed syringe-type MR fluid damper is 301.3 N while path gap dmr is 1 mm, drive current I is 0.5 A, frequency is 1 Hz and displacement is ±2 mm. And while path gap dmr is 5 mm, displacement is ±2 mm, frequency is 0.25 Hz and no drive current, the smallest damping force is 153.2 N, and the ratio of damping force is 1.97.
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