うず電流減衰効果を用いたセミアクティブ制振制御

抄録

The transmission coefficient of vibration in a single-degree-of-freedom vibration system is known to decrease by increasing the viscous damping, but not sufficiently in the high frequency range. The viscous damping coefficient of an object is changed by a magnetic damping mechanism using an eddy current, which can change the damping by turning the current to the electromagnet on and off without problems such as a friction and aging. In other words, the viscous damping is increased near the resonance point and decreased in the high frequency range by switching the current to the electromagnet on and off. The FFT is generally used to measure the frequency of the object, but a relatively long period of data is required to perform the FFT. Because the crossing of the resonance curve is a single point in the case of binary switching of the current, it is determined to use a low-pass filter in real time. In this paper, by changing the damping due to eddy current, the damping effect in a wide frequency range is verified by simulations and experiments.