磁気浮上型フィンを利用した振動型混合装置 : フィン加振機構の改良と水中攪拌フィンの減衰係数の同定

概要

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In order to improve the mixing efficiency for liquid-liquid or liquid-powder, vibratory mixer using levitated fin by magnetically repulsive force of a pair of permanent magnet is developed. The fin is excited by the outside magnetic force fluctuating periodically and performs reciprocating motion in cylindrical mixing tank. Some experiments are performed to clarify the characteristic of the motion of the fin and the frequency responses of the motion of the fin are show. The analytical model of the levitated Fin becomes the nonlinear oscillator because the magnetically repulsive force has strong non-linearity. The equation of motion of the fin with non-dimentional form is derived. The damping coefficient is an important parameter to specify the motion of the magnetically levitated fin in the water. In general, it is difficult to estimate the damping coefficient of oscillator when the damping capacity is very large. In this study the damping coefficient of vibrating fin in water is identified by using the phase method. It is confirmed that the damping coefficient of vibrating fin in water is changed greatly by the frequency.
2011-07-30