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的是，洗衣机的不平衡量非常大，每次操作它的方向和大小都会发生变化。为了抑制振动，本文尝试将被动振动控制理论应用于洗衣机的振动控制中，取得了以下成果：首先，建立了洗衣机的理论模型。通过改变参数值，进行了数值模拟，研究了减振效果。我们确定了共振峰从1/2降到了1/3。其次，我们通过实验研究了这些影响。在洗衣机笼子下面安装了一个减振器。由于不能得到与数值模拟已知的最优参数值相吻合的弹簧，所以不能得到与数值结果相同的结果。然而，我们可以很大程度上抑制振动。分析了摩擦对减振效果的影响。第三，研究了主动振动控制的效果。这种控制的思想是，当转子通过共振时，弹簧的刚度在磁铁的作用下发生突变。并进行了数值模拟。但这项研究目前正在进行调查。

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.