Vibration Suppression of Full Automatic Washing Machine

对全自动洗衣机的振动抑制进行了研究。与其他旋转机械不同，洗衣机的不平衡量非常大，每次运行时其方向和大小都在变化。为了抑制振动，我们尝试应用被动振动控制理论，并取得了以下成果：首先，我们得到了一个合适的理论模型的洗衣机。改变参数值，进行数值模拟，研究振动控制的效果。我们确定了共振峰降低了约1/2 ~ 1/3。其次，我们通过实验验证了这种效应。在洗衣机的机笼下面安装了一个减振器。由于无法得到与数值模拟已知的最优参数值相一致的弹簧刚度，因此无法得到与数值模拟结果相同的结果。但是，我们可以大大抑制振动。摩擦力对振动的抑制作用也很大。第三，研究了主动振动控制的效果。这种控制的思想是在转子通过共振时，利用电磁铁突变弹簧的刚度。进行了数值模拟。但这项研究目前正在调查中。

Vibration suppression of a full automatic washing machine was investigated. Different from the other rotating machinery, the unbalance of a washing machine is extremely large and its direction and magnitude change at every operation. In order to suppress vibration, we tried to apply passive vibration control theory and obtained the following results.First, we obtained a proper theoretical model of a washing machine. Changing parameter values, we executed numerical simulation and investigated the effects of vibration control. We ascertained that the peak of resonances decreased to about from 1/2 to 1/3.Secondly, we investigatd the effects by experiments. A vibration damper was mounted below the cage of washing mashine. Because springs whose stiffness coincides with the most optimal parameter values known by numerical simulation could not obtained, we could not get the same result as the numerical result. However, we could suppress the vibration considerably. It was also clarified that friction has considerable effect to the vibration suppression.Thirdly, we investigated the effect of active vibration control. The idea of this control is that the stiffness of spring is changed by magnet abruptly when the rotor passed the resonance. Numerical simulation was executed. But this research is under investigation now.