Investigate the Magnetic Pinning Effect of Ferro-Damp on Periodical Motion

• Main Authors: Jian-Xun Lin, 林建勳
• Other Authors: Je-Ee Ho
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/83841296378986460266

碩士 === 國立宜蘭大學 === 機械與機電工程學系碩士班 === 103 === Due to the reversal ferro-viscosity, induced by ferro-magnetization, without hysteresis, ferro-fluid has been recognized as a smart material effectively controlled by the field applied. With above special advantage, using the thermal property of ferro-viscosity to improve micro-lubrication and vibrating absorption, in tribology or seismic field, has gradually attracted public attention. In this study, a reversible ferro-damp, induced by magnetic attraction to reduce seismic wave by magnetic pin, is investigated which is quite different from the working manner of traditional shock-absorption considered. Here a theoretic model, responsible for periodic ferro-resonance, is introduced in kinematic analysis while the periodic oscillation is subjected. To enclosure the analytic model, a modified Langevin’s model accounting for the ferro-viscosity induced by magnetic intensity will be also taken into account. To examine the analytic validity, relevant experimental mode including ferro-sample in chemical preparation and the measured device of rotating transmission used to calibrate ferro-viscosity will be constituted as well. Consequently, the intended shock-absorption analysis, based on the characteristic of standing ferro-wave confined by magnetic pin including the location of node, fluctuating amplitude .vs. oscillating frequency & field intensity, could be promptly capture from video-camera suited on self-designed oscillating system. Keywords：Ferro-fluid, Ferro-damp, Ferro-viscosity